ON RESIN ACIDS. SYNTHESIS OF AN ANHYDRIDE OF 1:3-DIMETHYL- 1:3-DICARBOXYCYCLOHEXYL-2-ACETIC ACID

Diethyl 1:3-dimethylcyclohexane.2-one-1:3-dicarboxylate reacts with zinc end ethyl bromoacetate to give the corresponding hydroxy-ester, which on dehydration, catalytic reduction and subsequent hydrolysis affords the anhydride of 1:3-dimethyl-1:3-dicarboxycyclochexyl-2-acetic acid.