Results Cyclopentanone Syntheses. The cyclopentanones necessary for the study of bicyclic ring formation required (Y hydrocarbon chains in which a terminal double bond was separated from the ring by one, two, and three methylenes. The first of these, 2- allylcyclopentanone (4) was prepared through the thermolysis of an allyl ketal of cyclopentanone according to the procedure of Lorette and H~ ward.~
