Air-stable CpPd(NHC)Cl (NHC = N-heterocyclic carbene) complexes as highly active precatalysts for Kumada–Tamao–Corriu coupling of aryl and heteroaryl chlorides
A very straightforward one-pot method has been developed for preparation of air-gable CpPd(NHC)Cl complexes 1a-d. This new class of well-defined NHC-Pd complexes exhibits high catalytic activity in Kumada-Tamao-Corriu cross-coupling reaction involving various aryl and heteroaryl chlorides. Notably, the less sterically encumbered NHC ligand around Pd centre showed higher catalytic activity. (C) 2010 Elsevier B.V. All rights reserved.