Ethyl cyclopentanone-2-carboxylate (I) was prepared from diethyl adipate by a Dieckmann condensation in 88% yield. The 2-allyl derivative I1 was then made in 90% yield by a general alkylation procedure. Isomerization of the 2-allyl compound 11 to the 5-allyl derivative I11 was effected by the general method originally discovered by Openshaw and Robinson4 for isomerization of a cyclohexanone derivative and applied by Chatterjee and ...
