Starting from geranyl‐acetoacetic ester, 3,6,10‐trimethyl‐3‐carbohydroxyundeca‐1,5,9‐triene has been prepared. This sesquiterpenic acid, a new isomer of farnesic acid, is converted by action of a mixture of formic and sulphuric acid, into a bicyclic hydroxyacid, the skeleton of which is derived from 1,1,7,7,10‐pentamethyl‐decalin. The possibilities for sesquiterpene chains to cyclize to bicyclic systems containing gem. dimethyl groups are discussed.
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RE et al. (1958) studied this question.