Using rational ligand design, we have developed of a second-generation ligand, bis (3, 5-di-
tert-butylphenyl)(tert-butyl) phosphine, for the preparation of allylsilanes using the palladium-
catalyzed silyl-Heck reaction. This new ligand provides nearly complete suppression of
starting material alkene isomerization that was observed with our first-generation catalyst,
providing vastly improved yields of allylsilanes from simple alkene starting materials. The
studies quantifying the electronic and steric properties of the new ligand are described …