Abstract: The chloropalladation reactions of methylenecyclopropanes bearing phenyl substituents on the cyclopropane ring are shown to involve 1, 3 addition of the elements of Pd-C1 to the organic molecule, with cleavage of the 2, 3 u bond of the ring. Chloropalladation of 2, 2-diphenylmethylenecyclopropane in CDC13 or C6D6 solution gives a 1: l mixture of 1 and 4 as the kinetic products; 4 subsequently isomerizes to 1. In ...