Cycloalkylation of Benzene with Mono- and Dimethylsubstituted 3- Cyclohexenecarboxylic Acids and Corresponding Bicyclic γ- and . delta.-Lactones. Part 3. Reaction of 1,3-, 1,4-Dimethyl-, 4-Methyl-3- cyclohexenecarboxylic Acid, γ-Lactones of 3-Oxy-1,3-, 3-Oxy-1,4- dimethyl-, 3-Oxy-4-methyl- and δ-Lactone of 4-Oxy-1,4- dimethylcyclohexenecarboxylic Acid.