Substituted benzene derivatives having at least one benzene ring substituted by 3,3,3-trifluoropropyl group and process for their production

SUMMARY OF THE INVENTION
In a first aspect of the present invention, there is provided a trifluoropropyl derivative of mono-substituted benzene represented by the general formula: ##STR2## wherein R is halogen atom, trifluoromethyl-, n-octyl-, n-dodecyl- or phenoxy group not substituted or mono-substituted by 3,3,3-trifluoropropyl group, and n is an integer of 1,2 or 3, with the proviso that the total number of 3,3,3-trifluoropropyl group in said trifluoropropyl derivative of mono-substituted benzene is at most 3.
In a second aspect of the present invention, there is provided a process for producing a substituted benzene derivative having at least one benzene ring substituted by at least one 3,3,3-trifluoropropyl group which comprises bringing monosubstituted benzene represented by the formula ##STR3## wherein R.sup.1 is halogen atom, trifluoromethyl-, n-octyl, n-dodecyl or a phenoxy group, into a reaction with 3,3,3-trifluoropropylene in the presence of an acid catalyst selected from the group consisting of hydrogen fluoride, boron trifluoride and a mixture thereof.
BACKGROUND AND DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to certain novel substituted benzene derivatives having at least one benzene ring substituted by at least one 3,3,3-trifluoropropyl group and to a novel process for producing the above-mentioned substituted benzene derivative.
The substituted benzene derivatives having benzene ring(s) substituted by 3,3,3-trifluoropropyl group(s) are useful for a variety of purposes. However, as an instance for synthesizing aromatic compounds having benzene ring(s) substituted by 3,3,3-trifluoropropyl group, only a process (U.S. Pat. No. 3,080,428) has been proposed in which 3,3,3-trifluoropropyl ether, (CF.sub.3 CH.sub.2 CH.sub.2).sub.2 O, is brought into reaction with benzene in the presence of hydrogen fluoride to form 3,3,3-trifluoropropylbenzene. Further, since in the process, water is formed in the reaction, the catalytic reactivity during the reaction is reduced and the recovery of the used catalyst is difficult. In addition, since the starting material of the reaction, 3,3,3-trifluoropropyl ether is synthesized by a low-yield (50 to 60%) reaction of hydrogen fluoride, formaldehyde or its polymer and very expensive vinylidene fluoride, the thus synthesized 3,3,3-trifluoropropyl ether is highly expensive.
It is an object of the present invention to provide a trifluoropropyl derivative of mono-substituted benzene represented by the formula: ##STR4## wherein R is halogen atom, trifluoromethyl, n-octyl, n-dodecyl, or phenoxy group not substituted or mono-substituted by 3,3,3-trifluoropropyl group, and n is an integer of 1, 2 or 3, with the proviso that the total number of 3,3,3-trifluoropropyl group in said derivative of mono-substituted benzene is at most 3. A further object of the present invention is to provide a process for producing the above-mentioned derivative of mono-substituted benzene having at least one benzene ring substituted by at least one 3,3,3-trifluoropropyl group which comprises bringing a mono-substituted benzene of the formula, ##STR5## wherein R.sup.1 is halogen atom, phenoxy, trifluoromethyl, n-octyl or n-dodecyl group, into reaction with 3,3,3-trifluoropropylene in the presence of an acid catalyst selected from the group consisting of hydrogen fluoride, boron trifluoride and a mixture thereof. Still other objects will appear hereinafter.

In the drawing,
FIG. 1 shows the infrared absorption spectrum of chloro-(3,3,3-trifluoropropyl)benzene;
FIG. 2 shows that of chloro-bis(3,3,3-trifluoropropyl)benzene;
FIG. 3 shows that of (3,3,3-trifluoropropyl)benzotrifluoride;
FIGS. 4 and 5 show the infrared absorption spectrum and the mass spectrum, respectively of phenyl (3,3,3-trifluoropropyl)phenyl ether;
FIGS. 6 and 7 show those, respectively of n-octyl-(3,3,3-trifluoropropyl)benzene; and
FIGS. 8 and 9 show those, respectively n-dodecyl-(3,3,3-trifluoropropyl)benzene.

The trifluoropropyl derivatives of mono-substituted benzene having at least one benzene ring substituted by at least one 3,3,3-trifluoropropyl group of the present invention are new chemical compounds useful for a variety of purposes. The compounds of the present invention are useful as a dielectric material, insulating liquids or a synthetic intermediate for producing agricultural chemicals.
In the compounds of the present invention, alkylbenzens or diphenyl ethers both of which are substituted by 3,3,3-trifluoropropyl group(s) are useful as insulating liquid because of excellent electrical properties thereof. In the past, although polychlorobiphenyl (hereinafter abbreviated and referred to as PCB) has been used in large quantities as an insulating liquid because of the excellent electrical characteristics thereof, the use thereof has been prophibited or at least extremely restricted on account of the environmental pollution caused by PCB. As a substitute for PCB, various alkylaromatic compounds have been developed, however, any compound having the equally excellent electric characteristics to those of PCB has not been known. Since the dielectric constant of the alkylaromatic compound hitherto developed is only about 2 to 3, it is insufficient for use as an insulating liquid for producing a small capacitor having a large capacity.
The major electrical properties of the three compounds of the present invention are shown in the following table 1.
TABLE 1__________________________________________________________________________ Dielectric Volume Dielectric Dielectric loss (tan.delta.) resistivity Flash Pour Viscosity breakdown constant % (.OMEGA. .multidot. cm) point point (cst, at voltageCompound (at 80.degree. C.) (at 80.degree. C.) (at 80.degree. C.) (.degree.C.) (.degree.C.) 30.degree. C.) (KV/2.5 mm)__________________________________________________________________________Mono-substituted 6.1 0.15 4.5 .times. 10.sup.14 165 -45 6.5 72diphenyl ether by3,3,3-trifluoro-propyl groupMono-substituted 3.8 0.04 1.0 .times. 10.sup.14 150 -55 4.9 70n-octylbenzene by3,3,3-trifluoro-propyl groupMono-substituted 3.6 0.04 5.0 .times. 10.sup.14 170 -55 5.6 70n-dodecylbenzeneby 3,3,3-trifluoro-propyl group__________________________________________________________________________
In comparison of the data of the table 1 with the data of PCB (for instance, trichlorobiphenyl) described in the publications (Journal of Electrochemical Soc., page 57c, Table II and Nisshin Denki Giho, page 81, table 3), it is clearly seen that the compounds of the present invention has the same excellent electrical properties as those of PCB.
In the compounds of the present invention, chloro- or bromobenzene substituted by 3,3,3-trifluoropropyl group is easily hydrolyzed, for instance, in an aqueous solution of sodium hydroxide at 300.degree. C., to be converted into 3,3,3-trifluoropropylphenol. The thus obtained 3,3,3-trifluoropropylphenol is active in controlling Puccinia recondita f. sp. tritici on Wheat and Erysiphe graminis f. sp. tritici on Wheat (refer to "Example 7" of the compound on these plant diseases).
In the cases where a mono-substituted benzene is brought into reaction with 3,3,3-trifluoropropylene, since the group CF.sub.3 -- is strongly electron-withdrawing, the basicity of the carbon-carbon double bond of 3,3,3-trifluoropropylene is far weaker than that of propylene, a presence of a strongly acidic Friedel-Crafts' catalyst is necessary in the reaction between the mono-substituted benzene and 3,3,3-trifluoropropylene. However, in this case, the use of aluminum chloride as a representative strongly acidic Friedel-Crafts' catalyst causes the substitution of halogen on the benzene ring and/or cyclization of the reactants.
Since the catalyst used in the present invention is a gaseous substance or a low-boiling liquid, the removal of the used catalyst is easily carried out by stripping, and the recovery and the reuse of the remaining catalyst are also easy. The catalyst is preferably used in the process of the present invention in an amount of more than 0.5 mole per mole of the mono-substituted benzene used as a starting material. In the case of n-octylbenzene or n-dodecylbenzene being used, the preferable catalyst is hydrogen fluoride or boron trifluoride. The temperature of the reaction of the process depends on the species of the starting materials and the catalyst, and from the viewpoint of the species and properties of the catalyst, the reaction temperature should be highest in the case of hydrogen fluoride, followed by boron trifluoride and then by a mixture thereof. On the other hand, from the viewpoint of the starting material, the temperature should be highest in the case of benzotrifluoride, followed by monohalogenobenzene and then by diphenyl ether.
Accordingly, for instance, the reaction is preferably carried out at -20.degree. to 150.degree. C. in the presence of hydrogen fluoride, boron trifluoride or a mixture thereof, however, the actual temperature of the reaction is determined considering the reaction system, for instance, in the case of benzotrifluoride, the reaction is preferably carried out in the presence of the mixture of hydrogen fluoride and boron trifluoride at a temperature of 130.degree. to 180.degree. C.
Since in the process of the present invention, the mono-substituted benzene is brought into reaction with an industrial raw material, 3,3,3-trifluoropropylene in the presence of an acid catalyst to synthesize a trifluoropropyl derivative of mono-substituted benzene, not only the process necessitates only one reaction step, but also there is no formation of byproducts such as water, and accordingly, the catalytic activity is maintained with the extremely easy recovery of the used catalyst.
Furthermore, while the derivative of mono-substituted benzene of the present invention is shown by the above-mentioned formula, the reaction product of a benzene or its derivative and propylene (CH.sub.3 CH.dbd.CH.sub.2) is a benzene or its derivative substituted by isopropyl group, (CH.sub.3).sub.2 CH--. The difference of the two products is caused by the difference of basicity between the carbon-carbon double bond in 3,3,3-trifluoropropylene and that in propylene, the former being weaker than the latter, and this is the characteristic feature of the reaction adopted in the present invention.
That the derivative of mono-substituted benzene obtained by the process of the present invention has 3,3,3-trifluoropropyl group(s) has been confirmed by its .sup.1 H-NMR spectrum and .sup.19 F-NMR spectrum (Nuclear Magnetic Resonance spectrum).
After the above-mentioned reaction is over, the residual gas in the reaction system is purged, and then the residual catalyst is stripped followed by neutralization or washing with water and further distillation under a reduced pressure to obtain the product.
The trifluoropropyl derivative of mono-substituted benzene having at least one benzene ring substituted by at least one 3,3,3-trifluoropropyl group is useful, for instance, as a synthetic intermediate for producing pharmaceuticals and agricultural chemicals.
The followings are the more detailed explanation of the present invention while referring to non-limitative examples:
EXAMPLE 1
Into a stainless steel reaction tube, 6 g of chlorobenzene, 3 g of hydrogen fluoride and 4.5 g of 3,3,3-trifluoropropylene were introduced, and boron trifluoride was pressured into the tube so that the internal pressure of the tube became 2 kg/cm.sup.2.G. The tube was heated to 135.degree. C. to bring the content into reaction, the reaction having been carried out for 40 hours at the same temperature.
After the reaction was over, the gas in the tube was purged, and the content of the tube was poured onto a mixture of iced water and sodium hydrogen carbonate. Then the mixture was extracted with dichloromethane and the extract was washed with water. After separating the organic layer from the aqueous layer, the former was dried and then subjected to evaporation for the removal of dichloromethane. By subjecting the thus treated content to distillation under a reduced pressure, the three fractions were obtained, namely, 4.1 g of that of chloro-(3,3,3-trifluoropropyl)benzene boiling at 76.degree. C./25 mmHg, 1.2 g of that of chloro-bis(3,3,3-trifluoropropyl)benzene boiling at 105.degree. to 108.degree. C./8 mmHg and 0.2 g of that of chloro-tris(3,3,3-trifluoropropyl)benzene boiling at 176.degree. to 198.degree. C./5 mmHg.
The followings are the analytical data of the three fractions:
(i) chloro-(3,3,3-trifluoropropyl)benzene:
(a) Mass spectrography: 208 (M.sup.+), 173 (M.sup.+ --Cl) and 125 (M.sup.+ --CH.sub.2 CF.sub.3),
(b) Nuclear magnetic resonance spectroscopy: No signal of methyl was found in .sup.1 H-NMR spectrum and a signal of trifluoromethyl was observed in .sup.19 F-NMR spectrum at the position of nearby +3.4 ppm from the internal standard, benzotrifluoride, as a triplet.
(c) Elementary analysis:
______________________________________ C (%) H (%) Cl (%) F (%)______________________________________Found: 52.0 3.8 17.1 27.1Calcd. as C.sub.9 H.sub.8 ClF.sub.3 : 51.80 3.84 17.03 27.33______________________________________
(ii) chloro-bis(3,3,3-trifluoropropyl)benzene:
(a) Mass spectroscopy: 304(M.sup.+) and 221(M.sup.+ --CH.sub.2 CF.sub.3).
(iii) chloro-tris(3,3,3-trifluoropropyl)benzene:
(a) Mass spectroscopy: 400(M.sup.+) and 317(M.sup.+ --CH.sub.2 CF.sub.3).
EXAMPLE 2
Into a 300-ml stainless steel autoclave, 100 g of bromobenzene and 66 g of 3,3,3-trifluoropropylene were introduced, and boron trifluoride was further pressured into the autoclave so that the internal pressure of the autoclave became 60 kg/cm.sup.2.G. Then, the content was heated to 100.degree. C. while stirring to bring it into reaction, and the reaction was carried out for 21 hours at 100.degree. C. under agitation. After the reaction was over, the gas in the autoclave was purged and after dissolving the content of the autoclave into n-hexane, the hexane layer was washed with water and dried. After evaporating n-hexane from the organic layer, the residue was examined by gas chromatography. The results of ion-gas chromatography with raising the temperature of the specimen of the residue of evaporation at a rate of 10.degree. C. per min, of mass spectroscopy of the fractions of gas chromatography and of nuclear magnetic resonance spectrum of .sup.1 H and .sup.19 F, respectively of gas chromatography were set forth below.
Table 2 shows the respective areas of peaks in the gas chromatogram, representing the compounds shown in Table 2, expressed by percentage of the total area of all the peaks.
TABLE 2______________________________________Composition of the reaction product volatile ingas chromatography Composition (% by weight) based on the ratio of peak-areas of components appearing in the gas chromatogram of theComponent residue of evaporation______________________________________Bromo-(3,3,3-trifluoro- 42.2propyl)benzeneBromo-bis(3,3,3-trifluoro- 2.3propyl)benzeneBromo-tris(3,3,3-trifluoro- 0.1propyl)benzeneBromobenzene 55.4______________________________________
The identification of the compounds in Table 2 was carried out as in Example 1.
By subjecting the above-mentioned residue to distillation under a reduced pressure, 48 g of bromo-3,3,3-trifluoropropyl-benzene boiling at 90.degree. to 93.degree. C./4 mmHg was obtained. The followings are the analytical data of bromo-3,3,3-trifluoropropyl-benzene:
(a) Mass spectroscopy: 252(M.sup.+) and 169(M.sup.+ --CH.sub.2 CF.sub.3).
(b) Elementary analysis:
______________________________________ C (%) H (%) Br (%) F (%)______________________________________Found: 42.5 3.2 31.9 22.4Calcd. as C.sub.9 H.sub.8 BrF.sub.3 : 42.69 3.16 31.62 22.53______________________________________
(c) Nuclear magnetic resonance spectrometry: .sup.1 H--NMR: .delta.1.9.about.3.2 ppm (m, 4H: --CH.sub.2 --), .delta.6.9.about.7.7 ppm (m, 4H: Ar--H), .sup.19 F--NMR: a signal due to trifluoromethyl group was observed in the neighbourhood of position of +2.5 ppm from that of benzotrifluoride as an internal standard.
EXAMPLE 3
Into a stainless steel reaction tube, 13 g of benzotrifluoride, 5 g of hydrogen fluoride and 10 g of 3,3,3-trifluoropropylene were introduced, and boron trifluoride was pressured into the tube so that the internal pressure of the tube became to 2 kg/cm.sup.2.G and by heating the tube at 165.degree. C. and keeping at the same temperature for 24 hours, the reaction was carried out. After the reaction was over, the gas within the tube was purged, and the content of the tube was treated as in Example 1. The thus treated content was subjected to distillation under a reduced pressure to give the following three fractions, namely, 1.5 g of the first fraction of (3,3,3-trifluoropropyl)benzotrifluoride boiling at 65.degree. to 68.degree. C./18 mmHg, 5.9 of the second fraction of bis(3,3,3-trifluoro)benzotrifluoride boiling at 88.degree. to 91.degree. C./7 mmHg and 2.6 g of the third fraction of tris(3,3,3-trifluoropropyl)benzotrifluoride boiling at 188.degree. to 192.degree. C./9 mmHg. The analytical data on the three fractions are shown as follows:
(i) (3,3,3-trifluoropropyl)benzotrifluoride:
(a) Mass spectroscopy: 242(M.sup.+) and 159(M.sup.+ --CH.sub.2 CF.sub.3),
(b) Nuclear magnetic resonance spectrography:
No signal of methyl group was observed on .sup.1 H--NMR spectrum and signal of trifluoromethyl was observed as a triplet in .sup.19 F--NMR spectrum nearby +4.0 ppm from the benzotrifluoride as the internal standard.
(c) Elementary analysis:
______________________________________ C (%) H (%) F (%)______________________________________Found: 49.8 3.1 47.1Calcd. as C.sub.10 H.sub.8 F.sub.6 : 49.59 3.31 47.10______________________________________
(ii) Bis(3,3,3-trifluoropropyl)benzotrifluoride:
(a) Mass spectrography: 338(M.sup.+) and 255(M.sup.+ --CH.sub.2 CF.sub.3).
EXAMPLE 4
Into a one-liter stainless steel autoclave, 340 g of diphenyl ether and 230 g of 3,3,3-trifluoropropylene were introduced, and further boron trifluoride was pressured into the autoclave so that the internal pressure was raised from 2 to 58 kg/cm.sup.2.G. Then the content of the autoclave was heated to 50.degree. C. and kept at the same temperature for 20 hours to bring the content into reaction. After the reaction was over, the content was collected, washed with water and dried while following the conventional procedures. The gas chromatographical examination of the thus treated reaction mixture gave the results in the same manner as in Example 1, in Table 3.
TABLE 3______________________________________ Area of each peak (%)Component (refer to Table 2)______________________________________Monosubstituted diphenyl ether 53.1by 3,3,3-trifluoropropyl groupDisubstituted diphenyl ether 18.9by 3,3,3-trifluoropropyl groupTrisubstituted diphenyl ether 10.9by 3,3,3-trifluoropropyl groupUnsubstituted diphenyl ether 17.1______________________________________
Identification of the compounds in Table 3 was carried out as in Example 1.
By subjecting the above-mentioned reaction mixture to fine distillation under a reduced pressure, three fractions boiling respectively at 103.degree. C./2 mmHg, 124.degree. C./2 mmHg and 135.degree. to 137.degree. C./2 mmHg were obtained, the first fraction and the second fraction being monosubstituted diphenyl ether and the third fraction being disubstituted diphenyl ether, three fractions having respective purities higher than 99%. Their structures were confirmed by their mass spectra and their nuclear magnetic resonance spectra to be those shown above, respectively.
(a) Nuclear magnetic resonance spectrometry: .sup.1 H--NMR: .delta.1.9.about.3.0 ppm (m, 4H: --CH.sub.2 --), .delta.6.6.about.7.5 ppm (m, 9H: Ar--H), .sup.19 F--NMR: a signal due to trifluoromethyl group was observed in the neighbourhood of position of +3.9 ppm from that of benzotrifluoride as an internal standard.
EXAMPLE 5
In a stainless steel autoclave of a capacity of one liter, 262 g of n-octylbenzene and 172 g of 3,3,3-trifluoropropylene were introduced in the above-mentioned order, and then boron trifluoride was pressured into the autoclave to the internal pressure of 70 kg/cm.sup.2.G. After that, while maintaining the autoclave at a temperature of 40.degree. C., the reaction was carried out for 17 hours with stirring. After the reaction was over, the gas in the autoclave was purged, and the content of the autoclave was poured onto a mixture of iced water and sodium hydrogen carbonate. Then the mixture was extracted with dichloromethane and the extract was washed with water. After separating the organic layer from the aqueous layer, the former was dried and then subjected to evaporation for the removal of dichloromethane. By subjecting the resultant reaction mixture to a fine distillation under a reduced pressure, 182 g of a fraction boiling at 111.degree. to 117.degree. C./0.9 mmHg was obtained. That the fraction contained more than 99% of a novel compound, n-octyl-(3,3,3-trifluoropropyl)benzene, was confirmed by gas-chromatography and the following results of analyses:
(a) Mass spectrographical analysis at 20 eV: (m/e) 286 The mass spectrogram is shown in FIG. 7.
(b) Nuclear magnetic resonance spectrometry (CCl.sub.4 soln): .sup.1 H--NMR: .delta.6.9.about.7.3 ppm (m, 4H: Ar--H), .delta.1.1.about.3.2 ppm (m, 18H: --CH.sub.2 --), .delta.0.9 ppm (t, 3H: --CH.sub.3). .sup.19 F--NMR: a signal due to trifluoromethyl group was observed in the neighbourhood of positions from +2.8 and +3.0 ppm of that of benzotrifluoride as an internal standard as the overlap of two kinds of triplet.
(c) Elementary analysis:
______________________________________ C (%) H (%) F (%)______________________________________Found: 71.5 8.7 19.8Calcd. as C.sub.17 H.sub.25 F.sub.3 : 71.33 8.74 19.93______________________________________
(d) Infrared absorption spectrometry: The infrared absorption spectrogram was shown in FIG. 6.
(e) B.p.: 111.about.117.degree. C./0.9 mmHg.
(f) Specific gravity: 1.006 (20.degree. C.).
(g) Refractive index: 1.4547 (20.degree. C.).
The electrical properties of n-octyl(3,3,3-trifluoropropyl)benzene are shown in Table 4.
TABLE 4______________________________________Dielectric constant 4.18Dielectric loss (tan.delta.) (%) 0.095Volume resistivity (.OMEGA. .multidot. cm) 1.08 .times. 10.sup.14______________________________________
EXAMPLE 6
In a stainless steel autoclave of capacity of one liter, 369 g of n-dodecylbenzene and 166 g of 3,3,3-trifluoropropylene were introduced in the above-mentioned order, and then boron trifluoride was pressured into the autoclave to the internal pressure of 73 kg/cm.sup.2.G. After that, while maintaining the autoclave at a temperature of 40.degree. C., the reaction was carried out for 18 hours while stirring. After the reaction was over, the gas in the autoclave was purged, and the content of the autoclave was poured onto a mixture of iced water and sodium hydrogen carbonate. Then the mixture was extracted with dichloromethane and the extract was washed with water. After separating the organic layer from the aqueous layer, the former was dried and then subjected to evaporation for the removal of dichloromethane. By subjecting the resultant reaction mixture to a fine distillation under a reduced pressure, 117 g of a fraction boiling at 154.degree. C./0.8 mmHg to 152.degree. C./0.65 mmHg was obtained. That the fraction contained more than 99% of a novel compound, n-dodecyl-(3,3,3-trifluoropropyl)benzene, was confirmed by gas-chromatography and the following results of analyses:
(a) Mass spectrographical analysis at 20 eV: (m/e) 342 The mass spectrogram is shown in FIG. 9.
(b) Nuclear magnetic resonance spectrometry (CCl.sub.4 soln): .sup.1 H--NMR: .delta.7.0.about.7.3 ppm (m, 4H: Ar--H), .delta.1.1.about.3.2 ppm (m, 26H: --CH.sub.2 --), .delta.0.9 ppm (t, 3H: --CH.sub.3). .sup.19 F--NMR: a signal due to trifluoromethyl group was observed in the neighbourhood of positions from +2.7 and +2.9 ppm of that of benzotrifluoride as an internal standard as the overlap of two kinds of triplet.
(c) Elementary analysis:
______________________________________ C (%) H (%) F (%)______________________________________Found: 73.9 9.6 16.5Calcd. as C.sub.22 H.sub.33 F.sub.3 : 73.68 9.65 16.67______________________________________
(d) Infrared absorption spectrometry: The infrared absorption spectrogram was shown in FIG. 8.
(e) B.P.: 154.degree. C./0.8 mmHg to 152.degree. C./0.65 mmHg.
(f) Specific gravity: 0.978 (20.degree. C.).
(g) Refractive index: 1.4561 (20.degree. C.).
The electrical properties of n-dodecyl-(3,3,3-trifluoropropyl)benzene at a temperature of 20.degree. C. are shown in Table 5.
TABLE 5______________________________________Dielectric constant 3.89Dielectric loss (tan.delta.) (%) 0.015Volume resistivity (.OMEGA. .multidot. cm) 8.79 .times. 10.sup.14______________________________________
EXAMPLE 7
On the seedlings of wheet (Triticum aestivum) variety Norin No. 64 grown in soil in pots of 10 cm in diameter at three leaf-stage (16 seedlings/pot), an aqueous suspension of 3,3,3-trifluoropropylphenol (hereinafter referred to simply as "the phenol derivative") at a concentration of 500 ppm prepared by at first dissolving the phenol derivative in a small amount of acetone and diluting the solution with water was sprayed to wet the leaves and stems of the seedlings thoroughly. After the natural drying of the sprayed leaves and stems, an aqueous suspension of spores of the pathogenic fungus which were collected from the infected leaves of wheat plant by the fungus was sprayed on the thus treated seedlings and the seedlings not treated with the aqueous suspension of the phenol derivative to inoculate. The sprayed pots were kept in a glass house.
After 10 days of the artificial infection, the degree of infection by the plant diseases on the leaves of the seedlings was assessed by observation of the seedlings according to the following criterion.
TABLE 6______________________________________Degree of infection Extent of damage.sup.(1) observed______________________________________0 none0.5 less than 10%1 10 to 25%2 25 to 50%3 50 to 75%4 larger than 75%5 withered______________________________________ Note: ##STR6##
The results are shown in the following table 7.
TABLE 7______________________________________Degree of InfectionClassification Disease by (1) Disease by (2)______________________________________Treated by the phenol 1 0.5derivativeNot treated (control) 5 5______________________________________ Notes: (1) Pathogenic fungus: Puccinia recondita f. sp. tritici (2) Pathogenic fungus: Erysiphe graminis f. sp. tritici

Number	Date	Country
55-21094	Feb 1980	JPX
55-164435	Nov 1980	JPX
55-186563	Dec 1980	JPX
55-186564	Dec 1980	JPX

Number	Name	Date	Kind
3080428	Weinmayr	Mar 1963
4324929	Kobayashi et al.	Apr 1982

Substituted benzene derivatives having at least one benzene ring substituted by 3,3,3-trifluoropropyl group and process for their production

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