Certain mono-, di- or tri-substituted pyridyl esters of alkane sulfonic acids having insecticidal, acaricidal and nematocidal properties

DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an alkanesulfonate derivative represented by the general formula: ##STR2## wherein R.sup.1 is C.sub.1 -C.sub.12 alkyl, R.sup.2 is C.sub.1 -C.sub.12 alkyl or C.sub.1 -C.sub.4 alkyl which is substituted with halogen, X is halogen, m is 0, 1 or 2 and n is 0, 1 or 2,
a process for preparing it and an insecticidal or acaricidal, nematicide composition containing it. A compound represented by the general formula (1) can be used as an insecticide, acaricide or nematicide in paddy fields, plowed fields, fruit farms, forests or the like.
Certain alkanesulfonate derivatives are known to be useful as an active ingredient of an insecticide or a nematicide.
For example, 3-n-butylthiophenyl methanesulfonate and 3-ethylsulfonylphenyl methanesulfonate are described to be useful as an insecticide in Japanese Patent Publication No. 3898/1968 and Japanese Patent Laid-Open No. 98025/1973, respectively. Further, it is reported in J. Agr. Food Chem. 18(1), 57 (1970) that 6-chloro-2-pyridyl methanesulfonate has a nematicidal effect.
Alkanesulfonate derivatives of the prior art have an insufficient insecticidal effect on insect pests which have acquired a resistance to organic phosphate or carbamate insecticides or the like, and insect pests exhibiting a high susceptibility, so that a compound which can prevent such insect pests with a small amount has been desired.
The inventors of the present invention have found that a compound having a high insecticidal, acaricidal or nematicidal effect can be obtained by substituting the pyridine ring with an alkylthio, alkylsulfinyl or alkylsulfonyl group at the 6-position and with an alkanesulfonyloxy group at the 2-position as shown by the general formula: ##STR3## wherein R.sup.1 is C.sub.1 -C.sub.12 alkyl, R.sup.2 is C.sub.1 -C.sub.12 alkyl or C.sub.1 -C.sub.4 alkyl which is substituted with halogen, X is halogen, m is 0, 1 or 2 and n is 0, 1 or 2.
A compound represented by the general formula (1) can be prepared by reacting a compound represented by the general formula: ##STR4## wherein R.sup.1, X, m and n are as defined above and Y is a hydrogen, alkali or alkaline earth metal atom,
with a sulfonyl chloride represented by the general formula:
Cl--SO.sub.2 --R.sup.2 ( 3)
wherein R.sup.2 is as defined above,
or a sulfonic acid anhydride represented by the general formula:
(R.sup.2 SO.sub.2).sub.2 O (4)
wherein R.sup.2 is as defined above,
in a solvent, if necessary, in the presence of an acid binding agent, at a temperature of -10.degree. to 100.degree. C., preferably 0.degree. to 40.degree. C., for 0.5 to 10 hours.
Examples of the solvent to be used include water, aromatic hydrocarbons such as benzene, toluene and xylene; aliphatic hydrocarbons such as hexane, heptane and petroleum benzine; halogenated hydrocarbons such as chloroform and dichloromethane; aprotic polar solvents such as dimethylformamide and dimethyl sulfoxide; lower alcohols such as methanol and ethanol; ethers such as diisopropyl ether; diethyl ether, 1,2-dimethoxyethane, tetrahydrofuran and dioxane; nitriles such as acetonitrile and propionitrile; ketones such as acetone, diisopropyl ketone and methyl ethyl ketone. Examples of the acid binding agent include alkali metal hydroxides such as NaOH and KOH; alkaline earth metal hydroxides such as Ca(OH).sub.2 and Mg(OH).sub.2 ; alkali metal hydrides such as sodium hydride; alkali metal alcoholates such as sodium alcoholate; alkali metal oxides such as Na.sub.2 O and K.sub.2 O; alkali metal carbonates such as soda ash; sodium amide; aliphatic and aromatic tertiary amines such as triethylamine, dialkylaniline and pyridine.
In addition, silver oxide can be used as an acid binding agent.
Additionally, a phase transfer catalyst, for example, tetra-n-butylammonium bromide or triethylbenzylammonium chloride, may also be used to obtain the objective alkanesulfonate derivative in a high yield.
A compound represented by the general formula (1) wherein n is 1 or 2 can be prepared by obtaining a compound represented by the general formula (5) ##STR5## which corresponds to the compound represented by the general formula (1) wherein n is 0 and then treating the obtained compound with an oxidizing agent such as hydrogen peroxide. That is, when the obtained compound represented by the general formula (5) is treated in acetic acid containing 1.0 to 3.0 times by mol as much hydrogen peroxide as the compound represented by the general formula (5) at 0.degree. to 50.degree. C. for 3 to 7 hours, a compound represented by the general formula (1) wherein n is 1 can be obtained, while when the compound of the general formula (1) wherein n is 0 or 1 are treated in acetic acid containing 2.0 to 5.0 times by mol as much hydrogen peroxide at 0.degree. to 100.degree. C., preferably at 60.degree. to 100.degree. C., for 2 to 5 hours, a compound represented by the general formula ( 1) wherein n is 2 can be obtained in a high yield. In this treatment, alcohols such as t-butanol, acetone, water and their mixture can be used as a solvent in place of acetic acid.
Examples of the oxidizing agent to be used in oxidizing a compound represented by the general formula (1) wherein n is 0 into the corresponding compound of the general formula (1) wherein n is 1 include organic peroxides, halides, periodates, nitrogen oxides, ozone, metal oxides, and singlet oxygen as well as hydrogen peroxide. Additionally, this oxidation can be carried out by air or anodic oxidation.
Examples of the oxidizing agent to be used in oxidizing a compound represented by the general formula wherein n is 0 or 1 into the corresponding compound represented by the general formula (1) wherein n is 2 include peroxy acids, hydroperoxides, halogen, halogenating agents, ozone, oxygen/transition metal catalyst, potassium peroxysulfate, potassium permanganate, dinitrogen tetraoxide, sodium metaperiodate, osmium oxide (VIII), ruthenium oxide (VIII), sodium dichromate, and nitric acid as well as hydrogen peroxide. Additionally, the oxidation with electrodes is possible.
The pyridinol derivative represented by the general formula (2) which is a starting material can be prepared by the known methods (see, for example, U.S. Pat. No. 3,335,146), that is, by reacting 6-halogenpyridinol with an alkyl mercaptan.
Examples of the C.sub.1 -C.sub.12 alkyl which is R.sup.1 or R.sup.2 in the general formula (1) include methyl, ethyl, n-propyl, iso-propyl, n-butyl, sec-butyl, iso-butyl, n-amyl, iso-amyl, sec-amyl, n-hexyl, n-octyl and n-lauryl. Examples of the C.sub.1 -C.sub.4 alkyl substituted with halogen include chloromethyl, trifluoromethyl 2-chloroethyl, 3-chloropropyl, 3-bromopropyl and 4-chlorobutyl.
The compounds of the present invention may be used alone if desired, but they are generally formulated by blending suitable adjuvants to improve or stabilize the effects thereof and used as such or after being diluted if necessary. The compounds of the invention can be formulated in the conventional manners well-known in the art in any convenient form such as dust, granule, micro granule, wettable powder, flowable, emulsion, microcapsule, oil, aerosol, heating fumigant (e.g. mosquito repellent of an incense type or electric type), fuming agent such as fogging, non-heating fumigant, or toxic feed.
Examples of said adjuvants are carrier (i.e. diluent) and other adjuvants such as a spreader, emulsifying agent, wetting agent, dispersing agent, fixing agent or disintegrator. Examples of the liquid carrier are aromatic hydrocarbons such as toluene or xylene; alcohols such as methanol, butanol or glycol; ketones such as acetone; amides such as dimethylformamide; sulfoxides such as dimethyl sulfoxide; methylnaphthalene; cyclohexane, animal or vegetable oils; fatty acids; fatty acid esters or the like as well as petroleum distillates such as kerosine or gas oil.
Examples of the solid carrier are clay, kaolin, talc, diatomaceous earth, silica, calcium carbonate, montmorillonite, bentonite, feldspar, quartz or saw dust.
Surfactants are generally used as an emulsifying or dispersing agent. Examples of them are anionic, cationic, non-ionic and ampholytic surfactants such as sodium salt of higher alcohol sulfate, stearyltrimethylammonium chloride, polyoxyethylene alkylphenyl ether or laurylbetaine.
Examples of the spreaders are polyoxyethylene nonylphenyl ether and polyoxyethylene lauryl ether. Examples of the wetting agent are polyoxyethylene nonylphenyl ether and dialkyl sulfosuccinate. Examples of the fixing agent are carboxymethylcellulose and polyvinyl alcohol. Examples of the disintegrator are sodium ligninsufonate and sodium lauryl sulfate.
Furthermore, it is possible to blend two or more compounds of the present invention to obtain an improved insecticidal or acaricidal activity. In addition, it is also possible to use a compound of the present invention simultaneously with other physiologically active substances such as pyrethroids, e.g., allethrin, phthalthrin, permethrin, decamethrin, fenvalerate, or .alpha.-cyano-3-phenoxybenzyl, 2,2-dichloro-1-(4-ethoxyphenyl)-cyclopropane-1-carboxylate, and various isomers thereof, pyrethrum extract, organosphosphorus pesticides, e.g., DDVP, fenitrothion, diazinon or temefos, carbamate pesticides, e.g., NAC, MTMC, BPMC or pirimor, other pesticides, acaricides, bactericides, nematicides, herbicides, plant growth regulators, fertilizers, BT, insect hormones or other pesticides, thereby affording a multipurpose composition which exhibits an improved effect and further a synergistic effect, if things go well.
It is further possible to increase the effect of the composition several-fold by adding synergists for pyrethroids such as piperonyl butoxide, sulfoxide or safroxane.
Although the compounds of the present invention are stable to light, heat, oxidation or the like, antioxidant or ultraviolet absorber such as phenols, e.g., BHT or BHA, arylamines, e.g., .alpha.-naphthylamine, or benzophenone compounds may be added as a stabilizer to prepare a composition which exhibits a higher stability, if desired.
The content of active ingredients in the composition of the present invention varies depending on the conditions of use such as formulation form or application method, and is usually from 0.2 to 95% by weight, preferably from 0.5 to 80% by weight, although the active ingredient may be used alone in a special case.
The composition of the present invention may be used in an amount which depends on the conditions such as formulation form, season or method for application. Generally, it is used in an amount of 10 to 300 g/10 a (a=100 m.sup.2), and preferably 15 to 200 g/100 a (in terms of the active ingredient) for the control of insect pests in ornamental forest or livestock and in an amount of 2 to 200 mg/m.sup.2, preferably 5 to 100 mg/m.sup.2 (in terms of the active ingredient) for the purpose of exterminating hygienic insect pests. For example, from 15 to 120 g/10 a of the active ingredient is used in the case of dust, 30 to 240 g/10 a thereof is used in the case of granule and 40 to 250 g/10 a thereof is used in the case of emulsion or wettable powder. However, it may be possible, or even necessary, to use the active ingredient in an amount which is outside the range as specified above, in a special case.
The insect pests on which the pesticides, acaricides and nematicides of the present invention are effective are as follows; HEMIPTERA such as Nephotettix cincticeps, Sogatella furcifera, Nilaparvata lugens, Laodelphax striatellus, Riptortus clavatus, Nezara viridula, Stephanitis nashi, Trialeurodes vaporariorum, Aphis gossypii, Myzus persicae and Unaspis yanonensis; LEPIDOPTERA such as Phyllonorycter ringoneella, Plutella xylostella, Promalactis inonisema, Adoxophyes orana, Leguminivora glycinivorella, Cnaphalocrocis medinalis, Chilo suppressalis, Ostrinia furnacalis, Mamestra brassicae, Pseudaletia separata, Spodoptera litura, Parnara guttata and Pieris rapae crucivora; COLEOPTERA such as Anomala cuprea, Popillia japonica, Echinocnemus soqameus, Lissorhoptrus oryzophilus, Oulema oryzae, Anthrenus verbasci, Tenebroides mauritanicus, Sitophilus zeamais, Henosepilachna vigintioctopunctata, Callosobruchus chinensis, Monochamus alternatus and Aulacophora femoralis; HYMENOPTERA such as Athalia rosae japonensis and Arge similis; DIPTERA such as Culex pipiens fatigans, Aedes aegypti, Asphondylia sp., Hylemya platura, Musca domestica vicinia, Dacus cucurbitae and Agromyza oryzae; APHANIPTERA such as Pulex irritans, Xenopsylla cheopis and Ctenocephalides canis; THYSANOPTERA such as Scirtothrips dorsalis, Thrips tabaci, Thrips palmi and Baliothrips biformis; ANOPLURA such as Pediculus humanus corporis and Phthirus pubis; PSOCOPTERA such as Trogium pulsatorium and Liposcelis bostrychophus; ORTHOPTERA such as Gryllotalpa africana, Locusta migratoria, Oxya yezoensis, Blattella germanica and Periplaneta fuliginosa and ACARINA such as Tetranychus urticae, Panonychus citri, Tetranychus cinnabarinus, Tetranychus kanzawai and Rhizoglyphus echinopus.
The nematodes on which the nematicides of the present invention are effective are TYLENCHIDA such as Heterodera glycines, Heterodera elachist, Meloidogyne incognita, Pratylenchus neglectus, Aphelenchoides besseyi, Aphelenchoides ritzemabosi and Bursa phelenchus lignicolus.
The compound of the present invention is an excellent insecticide, acaricide or nematicide and can prevent insect pests effectively by contacting them with the compound. Alternatively, it can prevent insect pests on leaves by applying it at the root of plants. The compound has characteristics as a systemic insecticide without any phytotoxicity on the host crops.

Now, the present invention will be described by Examples.
SYNTHESIS EXAMPLE
Synthesis Example 1
6-n-Propylthio-2-pyridyl methanesulfonate (No. 1)
3.4 g of 6-n-propylthio-2-pyridinol and 2.2 g of anhydrous sodium carbonate were suspended in 25 ml of N,N-dimethylformamide, followed by stirring. 2.4 g of methanesulfonyl chloride was added dropwise to the suspension at 10.degree. C. After the addition, the bath was removed and the resulting mixture was allowed to stand to raise the temperature of the mixture to room temperature. The mixture was heated to 50.degree. C. and stirred for 2.5 hours. The reaction mixture was poured into 200 ml of chilled water and extracted with ether twice. The ether layer was washed with 5% aqueous caustic soda solution and water and dried over anhydrous sodium sulfate. The residue obtained by distilling away the solvent was purified by silica gel column chromatography (with toluene and n-hexane) to obtain 3.9 g of 6-n-propylthio-2-pyridyl methanesulfonate as a pale yellow oil (yield: 78.8%).
n.sub.D.sup.25 1.5465
PMR(CCl.sub.4), .delta.: 1.00 (t, 3H), 1.78 (q, 2H), 3.07 (t, 2H), 3.34 (s, 3H), 6.73 (d, 1H), 7.09 (d, 1H), 7.58 (d, 1H) ppm.
Synthesis Example 2
Synthesis of 6-isopropylsulfonyl-2-pyridyl methanesulfonate (No. 22)
2.2 g of 6-isopropylsulfonyl-2-pyridinol and 1.48 g of methanesulfonyl chloride were dissolved in 30 ml of methylene chloride. 1.65 g of triethylamine was added dropwise to the solution at 10.degree. C. or below. The mixture was stirred at room temperature for 2 hours and at 50.degree. to 60.degree. C. for 2 hours to complete the reaction. The reaction mixture was poured into 100 ml of chilled water to separate the methylene chloride layer. The water layer was further extracted with methylene chloride. The resulting organic layer was combined with the above methylene chloride layer. The combined layer was washed with water and chilled to remove the solvent. The resulting residue was purified by silica gel column chromatography (with ethyl acetate and n-hexane) to obtain 2.4 g of objective 6-isopropylsulfonyl-2-pyridyl methanesulfonate as a colorless crystal (yield: 76.0%).
m.p. 70.5.degree.-71.5.degree. C.
PMR(CCl.sub.4), .delta.: 1.40 (d, 3H), 3.69 (s, 3H), 3.51-3.88 (m, 1H), 7.57-7.74 (m, 1H), 8.30-8.57 (m, 2H) ppm.
Synthesis Example 3
Synthesis of 6-isobutylthio-2-pyridyl trifluoromethanesulfonate (No. 39)
A mixture of 6.5 g of 6-isobutylthio-2-pyridinol and 50 ml of pyridine was stirred and cooled to 10.degree. C. or below. 10 g of trifluoromethanesulfonic anhydride was added dropwise to the mixture. The temperature of the resulting mixture was brought to room temperature and the mixture was stirred at this temperature for 2 hours and at 50.degree. to 60.degree. C. for one hour to complete the reaction. The reaction mixture was poured into 200 ml of chilled water and extracted with benzene twice. The residue obtained by distillating away the benzene was purified by silica gel column chromatography (with toluene and n-hexane) to obtain 9.3 g of objective 6-isobutylthio-2-pyridyl trifluoromethanesulfonate as a colorless oil (yield: 84.3%).
n.sub.D.sup.25 1.4827
PMR(CDCl.sub.3) .delta.: 1.04 (d, 6H), 1.98 (m, 1H), 3.04 (d, 2H), 6.76 (d, 1H), 7.20 (d, 1H), 7.59 (t, 1H) ppm.
Synthesis Example 4
Synthesis of 6-n-propylsulfinyl-2-pyridyl methanesulfonate (No. 2)
2.83 g of 6-n-propylthio-2-pyridyl methanesulfonate (No. 1) was dissolved in 20 ml of acetic acid. 1.7 ml of 35% aqueous hydrogen peroxide was added dropwise to the obtained solution at room temperature. The resulting mixture was stirred for 3.5 hours. 1 ml of 35% aqueous hydrogen peroxide was added to the mixture and the reaction was continued for 3 hours. The reaction mixture was poured into 50 ml of chilled water and extracted with toluene twice. The toluene layer was washed with 5% NaOH until it was neutralized, washed with water, dried over anhydrous sodium sulfate and distilled to remove the solvent, thus obtaining 2.2 g of 6-n-propylthiosulfinyl-2-pyridyl methanesulfonate as a colorless crystal (yield: 73.3%).
m.p. 51.degree.-53.degree. C.
PMR(CDCl.sub.3) .delta.: 1.06 (t, 3H), 1.75 (m, 2H), 2.94 (m, 2H), 3.47 (s, 3H), 7.19 (t, 1H), 7.88-8.15 (m, 2H) ppm.
Synthesis Example 5
Synthesis of 6-n-propylsulfonyl-2-pyridyl methanesulfonate (No. 3)
2.2 g of 6-n-propylthio-2-pyridyl methanesulfonate (No. 1) was dissolved in 30 ml of acetic acid. 2.6 ml of 35% aqueous hydrogen peroxide was added to the solution at room temperature. The obtained mixture was stirred at 80.degree. to 90.degree. C. for 40 hours to complete the reaction. The reaction mixture was poured into water and extracted with methylene chloride twice. The extract was washed with 5% aqueous caustic soda until it was neutralized, washed with water, dried over anhydrous sodium sulfate and distilled to remove the solvent, thus obtaining 1.6 g of 6-n-propylsulfonyl-2-pyridyl methanesuolfonate as a light brown oil (yield: 68.3%).
n.sub.D.sup.25 1.5287
PMR(CDCl.sub.3) .delta.: 1.03 (t, 3H), 1.77 (m, 2H), 3.33 (m, 2H), 3.58 (s, 3H), 7.46 (d, 1H), 8.06-8.34 (m, 2H) ppm.
Other compounds of the present invention were synthesized according to the same procedures as the ones described in Synthesis Examples 1 to 5.
Representative compounds among the obtained ones are shown in Table 1.
TABLE 1__________________________________________________________________________ ##STR6##No. R.sup.1 n R.sup.2 Yield (%) n.sub.D.sup.25 (mp) Appearance__________________________________________________________________________1 CH.sub.3 CH.sub.2 CH.sub.2 0 CH.sub.3 78.8 1.5465 pale yellow oil2 CH.sub.3 CH.sub.2 CH.sub.2 1 CH.sub.3 73.3 (51.about.53.degree. C.) colorless crystal3 CH.sub.3 CH.sub.2 CH.sub.2 2 CH.sub.3 68.3 1.5287 Light brown oil4 CH.sub.3 CH.sub.2 CH.sub.2 0 CH.sub.2 CH.sub.3 90.1 1.5410 pale yellow oil5 CH.sub.3 CH.sub.2 CH.sub.2 1 CH.sub.2 CH.sub.3 87.9 1.5322 colorless oil6 CH.sub.3 CH.sub.2 CH.sub.2 2 CH.sub.2 CH.sub.3 89.1 1.5159 colorless oil ##STR7## 0 CH.sub.3 70.2 (40.about.40.5.degree. C.) colorless crystal8 ##STR8## 1 CH.sub.3 91.9 (87.5.about.88.5.degree. C.) colorless crystal9 ##STR9## 2 CH.sub.3 89.1 1.5156 colorless oil10 ##STR10## 0 CH.sub.2 CH.sub.3 78.5 1.5332 colorless oil11 ##STR11## 1 CH.sub.2 CH.sub.3 83.4 1.5256 "12 ##STR12## 2 CH.sub.2 CH.sub.3 84.6 (48.5.about.49.5.degree. C.) colorless crystal13 CH.sub.3 CH.sub.2 CH.sub.2 0 CH.sub.2 CH.sub.2 CH.sub.3 65.9 1.5349 colorless oil14 CH.sub.3 CH.sub.2 0 CH.sub.3 66.5 1.5546 colorless oil15 CH.sub.3 CH.sub.2 0 CH.sub.2 CH.sub.3 97.0 1.5476 "16 CH.sub.3 CH.sub.2 CH.sub.2 0 ##STR13## 33.6 1.5345 "17 CH.sub.3 CH.sub.2 CH.sub.2 0 CH.sub.2 CH.sub.2 CH.sub. 2 CH.sub.3 86.4 1.5290 colorless oil18 CH.sub.3 CH.sub.2 CH.sub.2 2 CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.3 90.0 1.5090 "19 ##STR14## 0 CH.sub.3 92.2 1.5444 "20 ##STR15## 1 CH.sub.3 87.4 1.5412 "21 ##STR16## 2 CH.sub.3 76.0 (70.5.about.71.5.degree. C.) colorless crystal22 ##STR17## 0 CH.sub.3 86.6 1.5420 colorless oil23 ##STR18## 1 CH.sub.3 87.0 1.5302 "24 ##STR19## 2 CH.sub.3 89.1 1.5210 "25 CH.sub.3 CH.sub.2 CH.sub.2 CH.sub.2 0 CH.sub.3 90.1 1.5320 brown oil26 CH.sub.3 CH.sub.2 CH.sub.2 CH.sub.2 1 CH.sub.3 72.2 1.5321 pale yellow oil27 CH.sub.3 CH.sub.2 CH.sub.2 CH.sub.2 2 CH.sub.3 78.5 1.5142 "28 CH.sub.3 CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 0 CH.sub.3 74.5 1.5362 "29 CH.sub.3 CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 2 CH.sub.3 94.6 (65.about.67.degree. C.) colorless crystal30 ##STR20## 0 CH.sub.3 74.5 1.5356 pale yellow oil31 ##STR21## 1 CH.sub.3 90.1 1.5281 colorless oil32 ##STR22## 2 CH.sub.3 85.1 1.5145 colorless oil33 ##STR23## 0 CH.sub.3 52.2 1.5371 pale yellow oil34 ##STR24## 2 CH.sub.3 88.5 1.5160 colorless oil35 CH.sub.3 0 CH.sub.3 68.4 1.5633 "36 CH.sub.3 2 CH.sub.3 56.2 (64.about.65.degree. C.) colorless crystal37 ##STR25## 0 CH.sub.2 Cl 58.4 1.5430 pale yellow oil38 ##STR26## 2 CH.sub.2 Cl 86.6 1.5240 colorless oil39 ##STR27## 0 CF.sub.3 84.3 1.4827 "40 ##STR28## 1 CF.sub.3 96.3 1.4789 "41 ##STR29## 2 CF.sub.3 95.2 1.4707 "42 ##STR30## 0 CH.sub.2 CH.sub.2 CH.sub.3 75.9 1.5291 "43 ##STR31## 2 CH.sub.2 CH.sub.2 CH.sub.3 85.2 1.5086 "44 n-C.sub.12 H.sub.25 0 CH.sub.3 81.6 (46.about.46.5.degree. C.) colorless crystal45 n-C.sub.12 H.sub.25 1 CH.sub.3 91.4 (63.about.64.degree. C.) colorless crystal46 n-C.sub.12 H.sub.25 2 CH.sub.3 91.4 (73.5.about.74.degree. C.) "47 n-C.sub.8 H.sub.17 0 CH.sub.3 74.2 1.5228 light brown oil48 n-C.sub.8 H.sub.17 1 CH.sub.3 87.6 (49.about.50.5.degree. C.) colorless crystal49 n-C.sub.8 H.sub.17 2 CH.sub.3 81.8 (58.about.59.5.degree. C.) "50 CH.sub.3 CH.sub.2 CH.sub.2 2 CH.sub.2 CH.sub.2 CH.sub.3 86.1 1.5119 colorless oil51 CH.sub.3 CH.sub.2 CH.sub.2 2 ##STR32## 89.6 1.5143 "52 ##STR33## 0 CH.sub.2 CH.sub.2 CH.sub.2 Cl 95.2 1.5412 "53 ##STR34## 1 CH.sub.2 CH.sub.2 CH.sub.2 Cl 80.7 (44.about.46.degree. C.) colorless crystal54 ##STR35## 2 CH.sub.2 CH.sub.2 CH.sub.2 Cl 81.6 (66.about.67.degree. C.) "55 ##STR36## 0 ##STR37## 47.0 1.5291 pale yellow oil56 ##STR38## 1 ##STR39## 77.1 1.5201 "57 ##STR40## 2 ##STR41## 90.2 1.5079 colorless oil58 ##STR42## 0 C.sub.5 H.sub.11 (n) 48.1 1.5228 light brown oil59 ##STR43## 1 C.sub.5 H.sub.11 (n) 86.2 1.5147 colorless oil60 ##STR44## 2 C.sub.5 H.sub.11 (n) 84.8 1.5046 "61 ##STR45## 0 C.sub.8 H.sub.17 (n) 44.2 1.5128 pale yellow oil62 ##STR46## 1 C.sub.8 H.sub.17 (n) 79.8 1.5077 colorless oil63 ##STR47## 2 C.sub.8 H.sub.17 (n) 91.8 1.4971 "64 ##STR48## 0 C.sub.2 H.sub.5 83.8 1.5358 pale yellow oil65 ##STR49## 1 C.sub.2 H.sub.5 94.5 1.5282 colorless oil66 ##STR50## 2 C.sub.2 H.sub.5 89.6 1.5160 pale yellow oil67 ##STR51## 0 C.sub.2 H.sub.5 80.8 1.5390 pale yellow oil68 ##STR52## 1 C.sub.2 H.sub.5 82.5 1.5308 colorless oil69 ##STR53## 2 C.sub.2 H.sub.5 89.1 1.5189 pale yellow oil__________________________________________________________________________
Synthesis Example 6
3-Chloro-6-ethylthio-2-pyridyl methanesulfonate (No. 70)
5 g of 3-chloro-6-ethylthio-2-pyridinol and 3.7 g of methanesulfonyl chloride were dissolved in 50 ml of methylene chloride, followed by stirring. 4 g of triethylamine was added dropwise to the solution at 10.degree. C. or below and the obtained mixture was allowed to stand to lower the temperature to room temperature. The mixture was heated to 40.degree. C. and stirred for 2 hours. 50 ml of chilled water was poured into the reaction mixture to separate the methylene chloride layer. The water layer was further extracted with 50 ml of methylene chloride. The obtained methylene chloride layer was combined with the above methylene chloride layer. The combined layer was washed with water and distilled to remove the solvent. The obtained residue was purified by silica gel column chromatography (with toluene and n-hexane) to obtain 6.6 g of objective 3-chloro-6-ethylthio-2-pyridyl methanesulfonate as a colorless crystal (yield: 93.4%). m.p. 40.degree. to 41.degree. C.
PMR(CDCl.sub.3), .delta.: 1.38 (t, 3H), 3.11 (q, 2H), 3.51 (s, 3H), 7.07 (d, 1H), 7.60 (d, 1H) ppm.
Synthesis Example 7
3,5-Dichloro-6-isobutylthio-2-pyridyl methanesulfonate (No. 82)
6.0 g of 3,5-dichloro-6-isobutylthio-2-pyridinol and 3.0 g of anhydrous sodium carbonate were suspended in 25 ml of N,N-dimethylformamide, followed by stirring. 3.3 g of methanesulfonyl chloride was added dropwise to the suspension at 10.degree. C. The obtained mixture was allowed to stand to lower the temperature to room temperature, heated to 50.degree. C. and stirred for 2.5 hours. The reaction mixture was poured into 200 ml of chilled water and extracted with ether twice. The ether layer was washed with 5% aqueous caustic soda and water, dried over anhydrous sodium sulfate and distilled to remove the solvent. The obtained residue was purified by silica gel column chromatography (with n-hexane and toluene) to obtain 5.8 g of objective 3,5-dichloro-6-isobutylthio-2-pyridyl methanesulfonate as a colorless oil (yield: 73.8%).
n.sub.D.sup.25 1.5690
PMR(CDCl.sub.3), .delta.:1.05 (d, 6H), 1.99 (m, 1H), 3.02 (d, 2H), 3.45 (s, 3H), 7.69 (s, 1H) ppm.
Synthesis Example 8
3,5-Dichloro-6-n-propylsulfinyl-2-pyridyl methanesulfonate (No. 76)
1.5 g of 3,5-dichloro-6-n-propylthio-2-pyridyl methanesulfonate (No. 75) synthesized according to the same procedure as the one described in Synthesis Example 1 was dissolved in 10 ml of acetic acid. 2 ml of 35% aqueous hydrogen peroxide was added dropwise to the obtained solution at 15.degree. C. The obtained mixture was heated to 40.degree. to 50.degree. C., stirred for 5 hours cooled, poured into 200 ml of ice-water and extracted with 50 ml of methylene chloride three times. The methylene chloride layer was washed with 5% aqueous caustic soda three times and with water and an aqueous solution of sodium chloride and dried over anhydrous sodium sulfate.
The oil obtained by distilling away the solvent was purified by silica gel column chromatography (with n-hexane and toluene) to obtain 0.9 g of objective 3,5-dichloro-6-n-propylsulfinyl-2-pyridyl methanesulfonate as a colorless crystal (yield: 43.0%). m.p. 92.degree. to 94.degree. C.
PMR(CDCl.sub.3), .delta.: 1.10 (t, 3H), 1.83 (m, 2H), 3.01 (t, 2H), 3.73 (s, 3H), 7.95 (s, 1H) ppm.
Synthesis Example 9
3,5-Dichloro-6-isobutylsulfonyl-2-pyridyl methanesulfonate (No. 84)
2.38 g of 3,5-dichloro-6-isobutylthio-2-pyridyl methanesulfonate (No. 82) was dissolved in 20 ml of acetic acid. 4 ml of 35% aqueous hydrogen peroxide was added dropwise to the obtained solution at room temperature. The resulting mixture was heated to 80.degree. to 90.degree. C., stirred for 5 hours, cooled, poured into 200 ml of ice-water and extracted with 50 ml of methylene chloride three times. The methylene chloride layer was washed with 5% aqueous caustic soda three times and with water and an aqueous solution of sodium chloride dried over anhydrous sodium sulfate and distilled to remove the solvent, thus obtaining 2.4 g of 3,5-dichloro-6-isobutylsulfonyl-2-pyridyl methanesulfonate as a colorless oil (yield: 91.9%).
n.sub.D.sup.25 1.5495
PMR(CDCl.sub.3), .delta.: 1.13 (d, 6H), 2.36 (m, 1H), 3.34 (d, 2H), 3.61 (s, 3H), 8.07 (s, 1H) ppm.
Other compounds of the present invention were synthesized according to the same procedures as the ones described in Synthesis Examples 6 to 9.
Representative compounds among the obtained ones are shown in Table 2.
TABLE 2__________________________________________________________________________ ##STR54##No. R.sub.1 n R.sub.2 (Cl).sub.m Yield (%) n.sub.D.sup.25 (mp) Appearance__________________________________________________________________________70 CH.sub.3 CH.sub.2 0 CH.sub.3 3-Cl 93.4 (40.about.41.degree. C.) colorless crystal71 CH.sub.3 CH.sub.2 2 CH.sub.3 3-Cl 89.3 (142.about.143.degree. C.) "72 ##STR55## 0 CH.sub.3 3-Cl 92.6 1.5540 pale yellow oil73 ##STR56## 1 CH.sub.3 3-Cl 85.8 (54.about.55.degree. C.) colorless crystal74 ##STR57## 2 CH.sub.3 3-Cl 85.7 (57.about.58.degree. C.) "75 CH.sub.3 CH.sub.2 CH.sub.2 0 CH.sub.3 3,5-Cl.sub.2 81.5 (68.about.69.degree. C.) pale yellow crystal76 CH.sub.3 CH.sub.2 CH.sub.2 1 CH.sub.3 3,5-Cl.sub.2 43.0 (92.about.94.degree. C.) colorless crystal77 CH.sub.3 CH.sub.2 CH.sub.2 2 CH.sub.3 3,5-Cl.sub.2 45.2 (129.about.131.degree. C.) colorless crystal78 CH.sub.3 CH.sub.2 CH.sub.2 0 C.sub.2 H.sub.5 3,5-Cl.sub.2 45.1 1.5650 pale yellow oil79 CH.sub.3 CH.sub.2 0 CH.sub.3 3,5-Cl.sub.2 87.7 (108.about.109.degree. C.) pale yellow crystal80 CH.sub.3 CH.sub.2 1 CH.sub.3 3,5-Cl.sub.2 83.7 (92.about.93.degree. C.) colorless crystal81 CH.sub.3 CH.sub.2 2 CH.sub.3 3,5-Cl.sub.2 81.5 (130.about.132.degree. C.) "82 ##STR58## 0 CH.sub.3 3,5-Cl.sub.2 73.8 1.5690 colorless oil83 ##STR59## 1 CH.sub.3 3,5-Cl.sub.2 77.6 (90.about.91.degree. C.) colorless crystal84 ##STR60## 2 CH.sub.3 3,5-Cl.sub.2 91.9 1.5495 colorless oil85 n-C.sub.8 H.sub.17 0 CH.sub.3 3,5-Cl.sub.2 82.2 1.5472 pale yellow oil86 n-C.sub.8 H.sub.17 1 CH.sub.3 3,5-Cl.sub.2 67.6 1.5410 colorless oil87 n-C.sub.8 H.sub.17 2 CH.sub.3 3,5-Cl.sub.2 92.4 (70.about.71.degree. C.) colorless crystal88 ##STR61## 0 CH.sub.3 3,5-Cl.sub.2 90.9 (38.about.39.degree. C.) "89 ##STR62## 1 CH.sub.3 3,5-Cl.sub.2 90.8 1.5605 colorless oil90 ##STR63## 2 CH.sub.3 3,5-Cl.sub.2 77.8 1.5435 pale yellow oil91 ##STR64## 0 ClCH.sub.2 CH.sub.2 CH.sub.2 3,5-Cl.sub.2 92.0 1.5652 colorless oil92 ##STR65## 2 ClCH.sub.2 CH.sub.2 CH.sub.2 3,5-Cl.sub.2 82.1 (80.about.81.degree. C.) colorless crystal93 n-C.sub.12 H.sub.25 0 CH.sub.3 3,5-Cl.sub.2 82.8 (51.about.53.degree. C.) colorless crystal94 ##STR66## 0 CF.sub.3 3,5-Cl.sub.2 78.8 1.5121 colorless oil__________________________________________________________________________
FORMULATION EXAMPLE
Formulation Example 1: Emulsifiable concentration
20 parts of a compound of the present invention was dissolved in 65 parts of a xylene/methylnaphthalene mixture. 15 parts of a mixture of an alkylphenol/ethylene oxide condensate and calcium alkylbenzenesulfonate in a ratio of 8:2 was mixed with the obtained solution to prepare an emulsifiable concentration. This emulsifiable concentration may be used as a spreading agent by diluting with water.
Formulation Example 2: Wettable powder
20 parts of a compound of the present invention was mixed with 35 parts of kaolin, 30 parts of clay and 7.5 parts of diatomaceous earth. 7.5 parts of a mixture of sodium laurate and sodium dinaphthylmethanesulfonate in a ratio of 1:1 was added to the obtained mixture. The resulting mixture was finely ground to prepare a powder. This powder may be used as a spreading agent by diluting with water.
Formulation Example 3: Dust
1 part of a compound of the present invention was mixed with 97 parts of a mixture of talc and calcium carbonate in a ratio of 1:1. The resulting mixture was ground to prepare a homogeneously dispersed mixture. 2 parts of silicic anhydride was added to this mixture. The resulting mixture was mixed and ground to prepare a dust. This dust may be used as a spreading agent as such.
Formulation Example 4: Granule
2 parts of a compound of the present invention was mixed with 48 parts of finely powdered bentonite, 48 parts of talc and 2 parts of sodium ligninsulfonate, followed by the addition of water. The resulting mixture was kneaded until it became homogeneous. The mixture was granulated by passing it through an injection molding machine and adjusted to a granular size of 0.6 to 1 mm by passing the granule thus molded through a spherizer and a drying screen classifier. The obtained granule may be directly spreaded on the surface of paddy fields and uplands as such.
Formulation Example 5: Oil
A mixture of 0.1 part of a compound of the present invention and 0.5 part of piperonyl butoxide was dissolved in such an amount of illuminating kerosine as to give the total volume of 100 parts to prepare an oil. This oil may be used as such.
Formulation Example 6: Aerosol
0.4 part of a compound of the present invention, 20 parts of piperonyl butoxide, 6 parts of xylene and 7.6 parts of deodorized kerosine were mixed and dissolved. After filling the mixture into an aerosol container, a valve was fitted. 86 parts of Freon was introduced into the container through the valve under pressure to obtain an aerosol.
Formulation Example 7: Heating fibrous fumigant pesticidal composition
0.05 g of a compound of the present invention was dissolved in an appropriate amount of chloroform. The obtained solution was homogeneously adsorbed on the surface of an asbestos (2.5.times.1.5 mm, 0.3 mm in thickness) to prepare a fibrous fumigant pesticidal composition of hot plate heating type.
Formulation Example 8: Mosquito-repellant incense
0.5 g of a compound of the present invention was dissolved in 20 ml of methanol, followed by the addition of 99.5 g of an incense carrier comprising tabu powder, pyrethrum marc and wood powder with a ratio of 3:5:1. The obtained mixture was made homogeneous by stirring. After distilling off the methanol, 150 ml of water was added to the residue and the mixture was sufficiently kneaded, molded and dried to obtain a mosquito-repellant incense.
The effects of the present invention will be described by the following Test Examples.
The compounds used in the Test Examples as a control are the following compounds (A), (B) and (C). These compounds were also tested according to the same method as the one for the test of compounds of the present invention.
______________________________________(A) ##STR67## (Japanese Patent Publication No. 3898/1968)(B) ##STR68## (Japanese Patent Laid-Open No. 98025/1973)(C) ##STR69## (J. Agr. Food chem., --18(1), 57______________________________________ (1970))
TEST EXAMPLE
Test Example 1: Effect on susceptible strains of Nephotettix cincticeps and resistant strains of Nephotettix cincticeps
The compounds of the present invention described in Table 3 were formulated according to the same procedures as the ones described in Formulation Examples 1 and 2 into 20% wettable powders when they were crystal, or into 20% emulsifiable concentration when they were oils, and were used for this test. Further a 50% emulsifiable concentration of BPMC (2-sec-butylphenyl methylcarbamate) and a 40% emulsifiable concentration of diazinon(diethyl 2-isopropyl-4-methyl-6-pyrimidinyl phosphorothionate) were used as a control.
Method: 5 to 6 rice plants in the tri- to tetra foliate stages were dipped in 200 ppm chemical solutions for 15 seconds. After air-drying, the plants were placed in a glass cylinder (.phi.4.5.times.15 cm). Then, ten female adults of Nephotettix cincticeps, susceptible strain (collected in Ageo city) and ten resistant strain (resistant to both organophosphorus and carbamates collected in Nakagawara, Masaki-cho and in Izumi) were transferred into the cylinder. After covering with a wire mesh, the cylinder was left in a temperature-controlled green house. 48 hours after treatment, the number of dead insects was counted to calculate the mortality. The results shown in Table 3 are averages of two replications.
TABLE 3______________________________________Mortality (%) Susceptible Resistant ResistantCompound (collected in (collected in (collected inNo. Ageo) Nakagawara) Izumi)______________________________________ 1 100 100 100 2 100 100 100 3 100 100 100 4 100 100 90 5 100 100 70 6 100 100 80 7 100 100 100 8 100 100 100 9 100 100 10010 100 100 10011 100 100 10012 100 100 10013 100 100 10020 100 100 9021 100 100 10022 100 100 10023 100 100 10024 100 100 10026 100 100 10027 100 100 10028 100 90 8029 100 100 10030 100 90 9031 100 100 7032 100 70 10033 100 100 10034 100 100 10037 100 100 10042 100 100 10043 100 100 9050 100 70 6059 80 90 8064 100 100 10065 100 100 10066 100 100 10067 100 100 10068 100 100 10069 100 100 10070 100 100 10072 100 100 10073 100 100 10074 100 80 6075 100 80 5078 100 70 5079 100 90 6082 100 100 5088 100 100 100ControlA 80 30 10B 100 20 10C 60 10 40BPMC 100 0 0Diazinone 100 0 0______________________________________
Test Example 2: Effect on Nilaparvata lugens
The compounds of the present invention and control compounds described in Table 4 were formulated according to the same procedure as the ones described in Formulation Examples 1 and 2 into 20% wettable powders or into 20% emulsifiable concentration and tested.
Method: The same procedure as described in the Test Example 1 were repeated, except that 10 female adults of Nilaparvata lungens were used. 48 hours after treatment, the number of dead insects was counted to calculate the mortality. The results shown in Table 4 are averages of two replications. Nilaparvata lugens, ten susceptible strains (collected in Kaseda city) and ten resistant strains (resistant to both organophosphorus and carbamates collected in Izumi was used in this test.
TABLE 4______________________________________ Mortality (%) Susceptible ResistantCompound (collected in (collected inNo. Kaseda) Izumi)______________________________________ 1 100 100 3 100 80 4 100 90 5 100 70 6 100 80 7 100 100 8 100 100 9 100 10019 100 10020 100 6021 100 10022 100 10023 100 10024 100 10025 100 10026 100 10027 100 10029 100 7030 100 9031 100 10033 100 8034 100 10035 100 8036 100 10040 100 10042 100 10055 100 10070 100 10072 100 10073 100 10075 100 10079 100 10088 100 100ControlA 90 30B 80 20C 20 10BPMC 100 0diazinon 100 20______________________________________
Test Example 3: Effects on larvae of Culex pipiens pallens
The compounds of the present invention and control compounds described in Table 5 were formulated into 0.1% acetone solutions and tested.
Method: 199.8 ml of well water was placed in a plastic container having a diameter of 9 cm. Twenty larvae of Culex pipiens pallens (third to forth instar), collected in Ageo city were transferred into the container. 0.2 ml of the above prepared solution was pipetted into the container to give a chemical solution of 1 ppm. After 24 hours, the number of dead insects was counted to calculate the mortality. The results are shown in Table 5.
TABLE 5______________________________________CompoundNo. Mortality (%) Compound No. Mortality (%)______________________________________ 3 100 12 100 4 100 13 100 5 100 14 100 6 100 15 100 7 100 19 100 8 100 20 100 9 100 21 10010 100 22 10011 100 23 100 24 10025 100 51 10026 100 52 10027 100 53 10028 100 54 10029 100 55 10030 100 56 10032 100 57 10033 100 58 10034 100 70 10035 100 71 10036 100 72 10037 100 73 10038 100 74 10039 100 75 10040 100 77 10041 100 78 10042 100 79 10043 100 82 10044 100 84 10045 100 88 10046 100 89 10047 100 90 10048 100 91 10049 100 92 10050 100 93 100 94 100ControlA 80B 20C 0______________________________________
Test Example 4: Effect on larvae of Plutella xylostella
Formulation used: A 20% emulsifiable concentration of the compound of the present invention described in Table 6.
Control: A 40% emulsifiable concentration of MEP (O,O-dimethyl O-4-nitro-m-tolyl phosphorothioate)
Method: A cabbage leaf of a medium size cut from a cabbage grown to decafoliate stage was dipped in a 500 ppm chemical solution for 15 seconds. After air-drying, the leaf was placed in a plastic container (9 cm.times.6 cm). 15 larvae (third instar) of Plutella xylostella were transferred into the container. After covering with a lid having several pinholes, the container was left in a green house at 25.degree. C. 48 hours after the treatment, the number of dead insects was counted to calculate the mortality. The results shown in Table 6 are averages of two replications.
TABLE 6______________________________________CompoundNo. Mortality (%) Compound No. Mortality (%)______________________________________72 100 87 10076 100 88 100 Control77 100 A 9083 100 B 6084 100 C 4085 100 MEP 10086 100______________________________________
Test Example 5: Effect on larvae of Chilo suppressalis
The compounds of the present invention and control compounds described in Table 7 were formulated according to the same procedures as the one described in Formulation Examples 1 and 20 into 20% wettable powders of 20% emulsifiable concentration and tested. Further, a 40% emulsifiable concentration of diazinon (diethyl 2-isopropyl-4-methyl-6-primidinyl phosphorothionate) was used as a control.
Method: 30 to 50 budding unhulled rices were dipped in a 200 ppm chemical solution for 15 seconds. After air-drying, the unhulled rices were placed in a plastic cup having a height of 6.0 cm and a diameter of 9.0 cm. Ten larvae (third instar) of Chilo suppressalis were transferred into the container. After covering with a plastic lid, the container was left in a thermo-hygrostatic room (having a temperature of 25.degree. C..+-.2.degree. C. and a humidity of 80%.+-.10%). 24 hours after the treatment, the number of dead insects was counted to calculate the mortality. The results shown in Table 7 are average of two replications.
TABLE 7______________________________________CompoundNo. Mortality (%) Compound No. Mortality______________________________________3 100 34 1004 100 37 1005 100 38 1006 100 43 1007 100 50 100 Control8 100 A 109 100 B 010 100 C 0______________________________________
Test Example 6: Effect on adults of Tetranychus urticae
The compounds of the present invention and control compounds described in Table 8 were formulated according to the same procedures as the ones described in Formulation Examples 1 and 2 into 20% wettable powders or 20% emulsifiable concentration and tested.
Method: The primary leaf of a potted kidney bean was trimmed to a size of approximately 3 cm.times.3 cm. 15 female adults mites susceptible to organophosphorus insecticides were transferred onto the leaf using a small brush. The plant was left in a temperature-controlled room at 25.degree. C. After one day, dead or abnormal mites were taken out of the leaf. The mites on the leaf were dipped in a 400 ppm chemical solution for 10 seconds. After the treatment, the plant was left in the room again. 48 hours after the treatment, the number of dead mites was counted under a stereomicroscope to calculate the mortality. The results are shown in Table 8.
TABLE 8______________________________________CompoundNo. Mortality (%) Compound No. Mortality (%)______________________________________ 4 100 37 100 7 100 38 10014 100 75 10015 100 80 10016 100 81 10017 100 85 10026 100 86 100 Control29 100 A 3030 80 B 5031 90 C 1032 80______________________________________
Test Example 7: Effect on the clubroot of tomatoes due to Meloidogyne incognita
400 g of soil polluted with Meloidogyne incognita was packed in a plastic cup having a diameter of 10 cm. The compounds of the present invention, control compounds of DCIP[bis(2-chloromethylethyl)ether]were formulated according to the same procedure as the one described in Formulation Example 3 into 1% dusts. 40 mg of each dust was applied to the soil, followed by entire mixing. Fifteen seeds (kind: Ponte rosa) were sown per cup. 40 days after the chemical treatment, the tomatoes were digged up and examined for damage due to chemicals and clubroot index. The results are shown in Table 9. The clubroot index was calculated by the following expression: ##EQU1## A: Number of tomato seedlings having at least 31 lumps at the root B: Number of tomato seedlings having 21 to 30 lumps at the root
C: Number of tomato seedlings having 11 to 20 lumps at the root
D: Number of tomato seedlings having 1 to 10 lumps at the root.
TABLE 9______________________________________Compound No. Clubroot index Damage______________________________________1 42 none3 44 "4 24 "6 35 "7 49 "9 27 "10 37 "12 31 "73 57 "79 60 none88 52 "Control (C) 74 "DCIP 83 "not treated 100 "______________________________________
Test Example 8: Effect on Thrips palmi
A 20% emulsifiable concentration of the compounds of the present invention described in Table 10 was prepared according to the same procedure as the one described in Formulation Example 1. A 50% emulsifiable concentration of BPMC (2-sec-butylphenyl methylcarbamate) and a 40% emulsifiable concentration of methiadathion (S-2,3-dihydro-5-methoxy-2-oxo-1,3,4-thiadiazol-3-ylmethyl O,O-dimethyl phosphorodithioate) were used as a control.
Method: Each emulsifiable concentration was diluted with a spreader (New Gramine) which had been diluted 2000 times to prepare a chemical solution having a given concentration. A cucumber leaf was dipped in the chemical solution for 10 seconds, air-dried and placed in a plastic cup having a diameter of 9 cm and a height of 5 cm. Ten larvae of Thrips palmi were transferred into the cup. After covering with a lid, the cup was left in a temperature-controlled room at 25.degree. C. After 48 hours, the number of dead insects was counted to calculate the mortality. A 50% lethal concentration (LC.sub.50 value) was determined from the mortality by the probit method. The results are shown in Table 10.
TABLE 10______________________________________Compound No. LC.sub.50 (ppm)______________________________________4 158 7.810 20Control BPMC >100methidathion 43______________________________________

Number	Date	Country	Kind
59-240150	Nov 1984	JPX
60-106995	May 1985	JPX

Certain mono-, di- or tri-substituted pyridyl esters of alkane sulfonic acids having insecticidal, acaricidal and nematocidal properties

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