Transmetalation reactions. The role of the stabilizing olefin in determining the overall reaction rate

A systematic study concerning the transmetalation reaction between the palladium butadienyl complexes [PdCl((ZCCZ)2Me)(L-L′)] (Z = COOMe; L-L′ = MeN-SPh (1A), N-SPh (1B), DPPQ-Me (1C), BiPy (1D), DPPE (1E)) and tributyl-phenylethynyl-stannane in the presence of some stabilizing olefins (ma, fn, nq, dmfu, and tmetc) was undertaken. The nature of the stabilizing olefin heavily affects the reaction rates which also depend on the donor capability and steric characteristics of the ligands.