1-Phosphabarrelene Complexes of Palladium and Their Use in Suzuki-Miyaura Coupling Reactions.

A bulky 1-phosphabarrelene, 2, was obtained from the reaction of a phosphinine with benzyne; two palladium complexes of 2 were successfully employed in the Suzuki–Miyaura coupling of several aryl chlorides with phenylboronic acid at a relatively low catalyst loading, and activated aryl chlorides were coupled at room temperature in the absence of strong bases.