Chemistry of alkylaromatic metallacycles. Regiochemistry of C-C coupling in ring opening or enlargement reactions of a palladacycle with alkynes

Article abstract of DOI:10.1016/0022-328X(95)05738-B

A phenylnorbornylpalladacycle containing methyl isonicotinate ligands was shown to undergo either ring opening or ring enlargement by reaction with acetylenic compounds to give norbornylalkynes regioselectively and ring-enlarged tetracyclic compounds non-regioselectively. However, in the case of ethyl propiolate regioselective ring enlargement takes place.