Acid - c10 - terpenylbenzoique and its salts or esters, anhydrides, the preparation of these compounds and their use in the preparation of 3 - c10 - terpenylcyclohexanol

摘要

Para-C10-terpenylbenzoic acid and salts, esters, and anhydrides thereof, their preparation, and their use as starting material in the preparation of the aroma chemical 3- C10-terpenylcyclohexanol by converting e.g. para-C10- terpenylbenzoic acid into meta- terpenylbenzoic by oxidation and decarboxylation in the presence of a copper compound, and hydrogenating the meta-terpenylphenol formed. Para-C10-terpenylbenzoic acid is prepared by (1) converting a bicyclic terpene having the formula C10H16 or a hydrogen halide addition product thereof into C10-terpenylbenzene by reaction with benzene in the presence of a Friedel-Crafts catalyst, (2) acetylating the C10-terpenylbenzene to form para-C10-terpenylacetophenone, and (3) oxidizing the para-C10- terpenylacetophenone to form para- C10-terpenylbenzoic acid.