Synthesis, Structure, and Reductive Elimination Chemistry of Three-Coordinate Arylpalladium Amido Complexes

摘要

Three-coordinate organopalladium(II) complexes are often claimed to be the species that forms the carbon-carbon or carbon-heteroatom bond in the product during reductive eliminations of palladium complexes with monodentate ligands.1-3 The intermediacy of such complexes has been deduced primarily from kinetic and computational studies. Three-coordinate organopalladium alkyl, aryl, alkoxo, or amido complexes have never been isolated or observed directly. The existence of true three-coordinate palladium(II) compounds without a donor in the open coordination site has even been called into question.4 We recently isolated arylpalladium halide complexes with a single phosphine,5 but each of these complexes contained an agostic interaction at the open site of a T-shaped geometry.