A Brønsted acid-catalyzed generation of palladium complexes: efficient head-to-tail dimerization of alkynes

Abstract

A Brønsted acid Ph₂P(O)OH can efficiently catalyze the reaction of a Pd(0) complex with an alkyne to produce a novel alkenyl(alkynyl)palladium complex via selective hydropalladation and ligand exchange processes. On the basis of this finding, an efficient Pd(0)/Ph₂P(O)OH mediated head-to-tail dimerization of alkynes was disclosed.