The sodium acetate-buffered peracetic acid oxidation of various 1-methoxybicyclo [2.2. 2] oct- 5-enones (4a-f), and (14), prepared by hydrolysis of the adducts (3)[(13)] derived from dihydroanisole derivatives (2)[(12)] and 2-chloroacrylonitrile leads to 4-substituted cyclohex- 2-en-1-one 4-acetic acid derivatives (7)[(15)].