Carbonic acid ester perfumes

Abstract

Carbonic acid esters of the formula ##STR1## wherein R.sub.1 is a member having from 8 to 12 carbon atoms selected from the group consisting of alkylcyclohexyl, alkenylcyclohexyl, alkynylcyclohexyl and cycloalkyl, and R.sub.2 is a member selected from the group consisting of alkyl having from 1 to 5 carbon atoms, alkenyl having from 2 to 5 carbon atoms and alkynyl having from 2 to 5 carbon atoms, which compounds have pleasing and persistent scents, as well as processes for producing them and perfume compositions containing them.

Description

OBJECTS OF THE INVENTION

An object of the present invention is the development of new ester compounds having very natural, pleasing and persistent scents, useful as perfumes.

Another object of the present invention is the development of a carbonic acid ester of the formula ##STR2## wherein R.sub.1 is a member having from 8 to 12 carbon atoms selected from the group consisting of alkylcyclohexyl, alkenylcyclohexyl, alkynylcyclohexyl and cycloalkyl, and R.sub.2 is a member selected from the group consisting of alkyl having from 1 to 5 carbon atoms, alkenyl having from 2 to 5 carbon atoms and alkynyl having from 2 to 5 carbon atoms.

A further object of the present invention is the development of a process for the production of the above carbonic acid esters consisting essentially of reacting a cycloaliphatic alcohol of the formula

R.sub.1 -OH wherein R.sub.1 is a member having from 8 to 12 carbon atoms selected from the group consisting of alkylcyclohexyl, alkenylcyclohexyl, alkynylcyclohexyl and cycloalkyl with a chloroformic acid ester of the formula ##STR3## wherein R.sub.2 is a member selected from the group consisting of alkyl having from 1 to 5 carbon atoms, alkenyl having from 2 to 5 carbon atoms and alkynyl having from 2 to 5 carbon atoms in an anhydrous, inert organic solvent in the presence of an HCl acceptor at a temperature of from 0.degree. to 5.degree. C, and recovering said carbonic acid ester.

A yet further object of the present invention is the production of a perfumery composition consisting essentially of from 1% to 50% by weight of the above carbonic acid esters and the remainder customary perfume constituents.

A still further object of the present invention is the improvement in the process of supplying a pleasing odor to a product by incorporating a perfume therein, of utilizing from 0.05 to 2% by weight of the above carbonic acid esters as said perfume.

These and other objects of the invention will become more apparent as the description thereof proceeds.

DESCRIPTION OF THE INVENTION

It has been found that carbonic acid esters of the general formula ##STR4## in which R.sub.1 represents a substituted cyclohexyl radical or a cycloaliphatic radical having 8 to 12 carbon atoms, and R.sub.2 represents a straight or branched chain, saturated or unsaturated aliphatic hydrocarbon radical having 1 to 5 carbon atoms, are valuable new perfumes having a very natural and complex scent.

More particularly the present invention relates to a carbonic acid ester of the formula ##STR5## wherein R.sub. 1 is a member having from 8 to 12 carbon atoms selected from the group consisting of alkylcyclohexyl, alkenylcyclohexyl, alkynylcyclohexyl and cycloalkyl, and R.sub.2 is a member selected from the group consisting of alkyl having from 1 to 5 carbon atoms, alkenyl having from 2 to 5 carbon atoms and alkynyl having from 2 to 5 carbon atoms. These compounds could also be called "alkyl cycloalkyl carbonates". The invention also consists of processes to produce the carbonic acid esters and to perfumery compositions.

The new compounds in accordance with the invention are produced by known processes by reacting cycloalkanols of the general formula R.sub.1 --OH with chloroformic acid esters of the general formula R.sub.2 O--COCl, in which R.sub.1 and R.sub.2 have the aforementioned significance, in anhydrous, inert solvents such as hexane, benzene, toluene in the presence of a hydrochloric acid acceptor such as an equivalent of pyridine at a reaction temperature of from 0.degree. to 5.degree. C.

Advantageously when tertiary cycloalkanols are employed such as 1-ethynylcyclohexanol, they are first converted into the corresponding sodium alcoholate by reaction with finely distributed sodium and are then reacted with chloroformic acid esters at about room temperature in an inert solvent to give the desired carbonic acid esters.

Cyclic starting alkanols which may be mentioned are, for example, alkylcyclohexanols such as menthol, carvomenthol, trans-3,3,5-trimethylcyclohexanol, cis-3,3,5-trimethylcyclohexanol; alkenylcyclohexanols such as 3-allylcyclohexanol; alkynylcyclohexanols such as 1-ethynylcyclohexanol; cycloalkanols such as cyclooctanol, cyclononanol, cyclodecanol, cycloundecanol and cyclododecanol. In view of their availability, cyclooctanol and cyclododecanol are the most important of the last-mentioned cycloalkanols having 8 to 12 carbon atoms.

By way of example, alkyl chloroformates such as the chloroformic acid methyl esters, the chloroformic acid ethyl ester, the chloroformic acid propyl ester, the chloroformic acid i-propyl ester, the chloroformic acid n-butyl ester, the chloroformic acid i-butyl ester, the chloroformic acid tertbutyl ester, the chloroformic acid amyl ester; alkenyl chloroformates such as the chloroformic acid allyl ester; and alkynyl chloroformates such as the chloroformic acid propargylester, may be mentioned as reaction partners to be reacted with the cyclic alkanols, the greatest importance being attached to chloroformic acid methyl ester and chloroformic acid ethyl ester, since products having the most intensive scent are obtained with these substances.

Consequently, new perfume esters in accordance with the invention are the following carbonic acid esters

methyl menthyl carbonate methyl carvomenthyl carbonate methyl 1-ethynylcyclohexyl carbonate methyl trans-3,3,5-trimethylcyclohexyl carbonate methyl cis-3,3,5-trimethylcyclohexyl carbonate methyl cyclooctyl carbonate methyl cyclononyl carbonate methyl cyclodecyl carbonate methyl cycloundecyl carbonate methyl cyclododecyl carbonate ethyl menthyl carbonate ethyl carvomenthyl carbonate ethyl 1-ethynylcyclohexyl carbonate ethyl trans-3,3,5-trimethylcyclohexyl carbonate ethyl cis-3,3,5-trimethylcyclohexyl carbonate ethyl cyclooctyl carbonate ethyl cyclononyl carbonate ethyl cyclodecyl carbonate ethyl cycloundecyl carbonate ethyl cyclododecyl carbonate propyl menthyl carbonate propyl 1-ethynylcyclohexyl carbonate propyl trans-3,3,5-trimethylcyclohexyl carbonate propyl cyclooctyl carbonate propyl cyclododecyl carbonate i-propyl 1-ethynylcyclohexyl carbonate i-propyl cis-3,3,5-trimethylcyclohexyl carbonate i-propyl cyclooctyl carbonate i-propyl cyclodecyl carbonate i-propyl cycloundecyl carbonate i-propyl cyclododecyl carbonate tert-butyl 1-ethynylcyclohexyl carbonate tert-butyl cis-3,3,5-trimethylcyclohexyl carbonate tert-butyl cyclooctyl carbonate tert-butyl cyclodecyl carbonate tert-butyl cycloundecyl carbonate tert-butyl cyclododecyl carbonate amyl trans-3,3,5-trimethylcyclohexyl carbonate amyl cyclooctyl carbonate amyl cyclononyl carbonate amyl cyclododecyl carbonate allyl 1-ethynylcyclohexyl carbonate allyl cis-3,3,5-trimethylcyclohexyl carbonate allyl cyclooctyl carbonate allyl cyclododecyl carbonate propargyl trans-3,3,5-trimethylcyclohexyl carbonate propargyl cyclooctyl carbonate propargyl cyclododecyl carbonate methyl 2-tert.-butylcyclohexyl carbonate ethyl 2-tert.-butylcyclohexyl carbonate methyl 4-tert-butylcyclohexyl carbonate ethyl 4-tert-butylcyclohexyl carbonate.

The most important of the aforementioned compounds suitable as new perfumes are methyl 1-ethynylcyclohexyl carbonate, methyl cis-3,3,5-trimethylcyclohexyl carbonate, methyl trans-3,3,5-trimethylcyclohexyl carbonate, methyl cyclooctyl carbonate, ethyl trans-3,3,5-trimethylcyclohexyl carbonate, ethyl cyclooctyl carbonate, and the methyl and ethyl 2-tert.-butyl and 4-tert. butylcyclohexyl carbonates.

The new perfume esters in accordance with the invention are distinguished by particularly intensive and lasting flowery, herbal, fruity and fresh scents of high quality and fullness. A further advantage of the new perfume esters is that they can be very satisfactorily combined to form novel nuances of fragrance and that they have a particularly high degree of persistence.

The new perfume esters in accordance with the invention may be mixed with other perfumes in a wide range of quantity ratios to form new perfumery compositions. However, in general, the proportion of the new perfume esters in the perfumery compositions will be from 1 to 50% by weight relative to the total composition. The remainder of the composition is conventional perfume constituents. Such compositions can act directly as perfumes or, alternatively, to perfume cosmetics such as creams, lotions, toilet waters, aerosols, toilet soaps, etc. Alternatively, however, they may be used to improve the odor of technical products such as washing and cleaning agents, disinfectants, agents for treating textiles etc., as is also possible in the case of the new compounds themselves.

The present invention will now be further described by means of the following Examples which are not to be limitative in any manner.

EXAMPLES

The production of the new perfumes will be described in the first instance.

EXAMPLE 1

Methyl cyclooctyl carbonate

18.9 gm of methyl chloroformate were added drop-by-drop under agitation to a solution of 25.6 gm of cyclooctanol and 15.8 gm of absolute pyridine in 150 ml of dry benzene under external cooling at 0.degree. to 5.degree. C. After the methyl chloroformate had been added, agitation was continued for 12 hours at room temperature. Then, the benzene phase was drawn off from the precipitated pyridine hydrochloride, and washed with diluted hydrochloric acid, sodium hydroxide solution and water, and dried. After the solvent had been distilled off, the raw ester was distilled in vacuo by means of a Vigreux column. A colorless liquid was obtained which had a herbal, very natural and complex fragrance which is distinguished by a strong and long-clinging flowery jasmine scent.

Characteristic values:

______________________________________Boiling point 47.degree. C at 0.01 mm HgRefractive index n.sub.D.sup.20 = 1.4580IR (film) 1735, 1445, 1275, 945, 800/cmNMR (CCl.sub.4) .delta. = 1.60 (m), 14 H; 3.7 (s), 3 H (--OCH.sub.3); 4.75 (m), 1 H ppm______________________________________

EXAMPLE 2

Ethyl cyclooctyl carbonate

The product was obtained similarly as in Example 1 by reacting cyclooctanol with ethyl chloroformate and a colorless liquid was obtained.

______________________________________Odor flowery, sweet, fruity, very natural and complex, syringa fragranceBoiling point 55.degree. C at 3.0 mm HgRefractive index n.sub.D.sup.20 = 1.4572IR (film) 1730, 1450, 1265, 953, 790/cmNMR (CCl.sub.4) .delta. = 1.27 (t), J = 7 Hz, 3 H (C--CH.sub.3); 1.57 (m), 14 H; 4.08 (q) J = 7 Hz, 2 H (O-- CH.sub.2 --C); 4.75 (m), 1 H (CH--O) ppm.______________________________________

EXAMPLE 3

Methyl trans-3,3,5-trimethylcyclohexyl carbonate

This substance was produced, analogously to Example 1, from trans-3,3,5-trimethylcyclohexanol and methyl chloroformate.

______________________________________Odor earthy, fruity, very natural smell, fragrance of forest soil or humus.Boiling point 88.degree. C at 3.2 mm Hg; colorless liquidRefractive index n.sub.D.sup.20 = 1.4428IR (film) 1750, 1445, 1275, 1240, 1180, 930/cmNMR (CCl.sub.4) .delta. = 3.65 (s), 3 H (OCH.sub.3); 4.87 (m), 1 H (CH--0) ppm______________________________________

EXAMPLE 4

Ethyl trans-3,3,5-trimethylcyclohexyl carbonate

The substance was produced from trans-3,3,5-trimethylcyclohexanol and ethyl chloroformate in accordance with the procedure given in Example 1.

______________________________________Odor fruity, camphoric, similar to piconia, suitable for cedar fragrancesBoiling point 56.degree. C at 0.01 Hg; colorless liquidRefractive index n.sub.D.sup.20 = 1.4412IR (film) 1740, 1375, 1270, 1240, 1180, 1010/cmNMR (CCl.sub.4) .delta. = 1.32 (t), J = 7 Hz, 3 H; 4.17 (q), J = 7 Hz, 2 H; 4.95 (m), 1 H ppm.______________________________________

EXAMPLE 5

Methyl cis-3,3,5-trimethylcyclohexyl carbonate

The substance was produced, analogously to Example 1, from cis-3,3,5-trimethylcyclohexanol and methyl chloroformate.

______________________________________Odor very natural, fresh, metallic, suit- able for artifical neroli petit- grain palmarosa oilBoiling point 60.degree. C at 0.1 mm Hg; colorless liquidRefractive index n.sub.D.sup.20 = 1.4401IR (film) 1750, 1445, 1270, 1240, 960/cmNMR (CCl.sub.4) .delta. = 3.6 (s), 3 H; 4.66 (m), J.sub.ae = 4.5 Hz, J.sub.aa = 11.5 Hz, 1 H ppm______________________________________

EXAMPLE 6

Methyl 1-ethynylcyclohexyl carbonate

A solution of 36.0 gm of 1-ethynylcyclohexanol in 50 ml of benzene was slowly added drop-by-drop to an agitated suspension, cooled to 0.degree. to 5.degree. C, of 5.5 gm of finely distributed sodium in 50 ml of absolute toluene and 250 ml of benzene, and was agitated at room temperature until reaction had been completed. 26.0 gm of methyl chloroformate were added under cooling to the sodium salt which has been formed. The mixture was allowed to react for 12 hours at room temperature and was washed several times with water and dried. After distilling off the solvent, the raw ester was fractionated by means of a 20 cm Vigreux column. The methyl 1 -ethynylcyclohexyl carbonate thus obtained constitutes a colorless liquid having a fruity, herbal, complex odor and a distinctive fragrance of dill, and has the following characteristic values;

______________________________________Boiling point 47.degree. C at 3.5 mm HgRefractive index n.sub.D.sup.20 = 1.4630IR (film) 3280, 2940, 2110, 1755, 1440, 1280, 1245, 1020/cmNMR (CCl.sub.4) .delta. = 1.1 - 2.4 (m), 10 H; 2.55 (s) 1 H (C.tbd.CH); 3.7 (s), 3 H (OCH.sub.3) ppm______________________________________

EXAMPLE 7

Methyl 2-tert.-butylcyclohexyl carbonate

The product was obtained, analogously to Example 1, from 2-tert-butylcyclohexanol and methyl chloroformate.

______________________________________Odor camphoric, earthy, fruit fragranceBoiling point 67.degree. C at 0.05 Hg; colorless liquid setting up to crystals on standing.______________________________________

EXAMPLE 8

Ethyl 2-tert.-butylcyclohexanol and ethyl chloroformate.

The product was obtained, analogously to Example 1, from 2-tert.-butylcyclohexanol and ethyl chloroformate.

______________________________________Odor woody, fruity fragranceBoiling point 73.degree. C at 0.05 Hg; colorless liquidRefractive index n.sub.D.sup.20 = 1.4517______________________________________

EXAMPLE 9

Methyl 4-tert.-butylcyclohexyl carbonate

The product was obtained, analogously to Example 1, from 4-tert.-butylcyclohexanol and methyl chloroformate.

______________________________________Odor fruity, spicy, woody fragranceBoiling point 95.degree. C at 0.8 Hg; colorless liquidRefractive index n.sub.D.sup.20 = 1.4534______________________________________

EXAMPLE 10

Ethyl 4-tert.-butylcyclohexyl carbonate

The product was obtained, analogously to Example 1, from 4-tert.-butylcyclohexanol and ethyl chloroformate.

______________________________________Odor fruity, woody fragranceBoiling point 106.degree. C at 1.5 Hg; colorless liquidRefractive index n.sub.D.sup.20 = 1.4512______________________________________

All the compounds given in the above Examples have natural flowery, herbal, fruity, fresh fragrances with excellent clinging properties or persistency which render them suitable for producing a wide variety of perfume compositions. Such compositions can be used to perfume a wide variety of products, such as cosmetics, washing agents, soaps as well as technical products in concentrations of approximately 0.05 to 2% by weight. Examples of perfumery compositions having a content of the new perfume esters in accordance with the invention are given hereinafter.

EXAMPLE 11

"Jasmine" perfume composition

______________________________________Methyl cyclooctyl carbonate 230 parts by weightBenzyl acetate 350 parts by weightLinalool 60 parts by weightLinalyl acetate 60 parts by weightHydroxycitronellal 60 parts by weightYlang oil I 40 parts by weightAurantesin B, H&R 25 parts by weightHedion, Firmenich 25 parts by weightLilial L.G. 20 parts by weightBenzyl salicylate 35 parts by weightGeranyl acetate 25 parts by weightAldehyde C 14 so-called 10% 15 parts by weightIsoraldein 70 L.G. 15 parts by weightParacresylphenyl acetate 10% 15 parts by weightPhenylethyl acetate 20 parts by weightIndoflor H&R 5 parts by weight______________________________________

EXAMPLE 12

Wood base perfume composition

______________________________________Ethyl trans-3,3,5-trimethyl-cyclo hexyl carbonate 500 parts by weightOryclon 100 parts by weightVetiveryl acetate 100 parts by weightSandalwood oil 100 parts by weightIsoraldein 70 50 parts by weightGuaiyl acetate 50 parts by weightCumarine 50 parts by weightPhenylethyl alcohol 50 parts by weight______________________________________

In the preceding Examples 11 and 12 a number of ingredients were indicated by tradename. These ingredients are as follows:

Aurantesin B, H & R - A Schiff's base from the methyl ester of anthranilic acid + hydroxycitronellal Hedion, Firmenich - methyl dihydrojasmonate Lilial L. G. - 4-tert.-butyl-.alpha.-methyl-hydrozimtaldehyde Aldehyde C 14 - .gamma.-undecalactone Isoraldein 70 L.G. - a mixture of .alpha.-, .beta.- and .gamma.-methylionone Indoflor, H & R - Indeno-dioxan having the formula ##STR6##

Orclon - cis-/trans-p-tert.-butyl-cyclohexyl acetate

EXAMPLE 13

Soap perfume composition

______________________________________Citrenes 450 parts by weightEthyl cyclooctyl carbonate 325 parts by weightMethyl anthralinate 100 parts by weightIndole 5 parts by weightBergamot oil 70 parts by weightTolu balsam 50 parts by weight______________________________________

This soap perfume composition is added to a toilet soap in amounts of from 0.5 to 1% by weight.

The preceeding specific embodiments are illustrative of the practice of the invention. It is to be understood however, that other expedients known to those skilled in the art or disclosed herein may be employed without departing from the spirit of the invention or the scope of the appended claims.

Claims

1. A perfumery composition consisting essentially of from 1% to 50% by weight of a carbonic acid ester of the formula ##STR7## wherein R.sub.1 is a member having from 8 to 12 carbon atoms selected from the group consisting of alkylcyclohexyl alkenylcyclohexyl, alkynylcyclohexyl and cycloalkyl, and R.sub.2 is a member selected from the group consisting of alkyl having from 1 to 5 carbon atoms, alkenyl having from 2 to 5 carbon, and alkynyl having from 2 to 5 carbon atoms, and the remainder customary constituents of perfumery compositions.

2. The perfumery composition of claim 1 wherein R.sub.1 is a member selected from the group consisting of 1-ethynylcyclohexyl, cis-3,3,5-trimethylcyclohexyl, trans-3,3,5-trimethylcyclohexyl, 2-tert.-butylcyclohexyl and 4-tert.-butylcyclohexyl.

3. The perfumery composition of claim 1 wherein R.sub.1 is a member selected from the group consisting of cyclooctyl and cyclododecyl.

4. The perfumery composition of claim 1 wherein R.sub.2 is a member selected from the group consisting of methyl and ethyl.

5. The perfumery composition of claim 1 wherein R.sub.1 is methyl and R.sub.2 is cyclooctyl.

6. The perfumery composition of claim 1 wherein R.sub.1 is ethyl and R.sub.2 is cyclooctyl.

7. The perfumery composition of claim 1 wherein R.sub.1 is methyl and R.sub.2 is trans-3,3,5-trimethylcyclohexyl.

8. The perfumery composition of claim 1 wherein R.sub.1 is ethyl and R.sub.2 is trans-3,3,5-trimethylcyclohexyl.

9. The perfumery composition of claim 1 wherein R.sub.1 is methyl and R.sub.2 is cis-3,3,5-trimethylcyclohexyl.

10. The perfumery composition of claim 1 wherein R.sub.1 is methyl and R.sub.2 is 1-ethynylcyclohexyl.

11. The perfumery composition of claim 1 wherein R.sub.1 is methyl and R.sub.2 is tert.-butylcyclohexyl.

12. The perfumery composition of claim 1 wherein R.sub.1 is ethyl and R.sub.2 is 2-tert.-butylcyclohexyl.

13. The perfumery composition of claim 1 wherein R.sub.1 is methyl and R.sub.2 is 4-tert.-butylcyclohexyl.

14. The perfumery composition of claim 1 wherein R.sub.1 is ethyl and R.sub.2 is 4 -tert.-butylcyclohexyl.