Palladium(II)‐N‐heterocyclic carbene complexes: synthesis, characterization and catalytic application
N‐Heterocyclic carbenes (NHCs) are of great importance and are powerful ligands for transition metals. A new series of sterically hindered benzimidazole‐based NHC ligands (LHX) (2a, 2b, 2c, 2d, 2e, 2f), silver–NHC complexes (3a, 3b, 3c, 3d, 3e, 3f) and palladium–NHC complexes (4a, 4b, 4c, 4d, 4e, 4f) have been synthesized and characterized using appropriate spectroscopic techniques. Studies have focused on the development of a more efficient catalytic system for the Suzuki
coupling reaction of aryl chlorides. Catalytic performance of Pd–NHC complexes and in situ prepared Pd(OAc)2/LHX catalysts has been investigated for
the Suzuki cross‐coupling reaction under mild reaction conditions in aqueous N,N‐dimethylformamide (DMF). These complexes smoothly catalyzed the Suzuki–Miyaura
reactions of electron‐rich and electron‐poor aryl chlorides. Copyright © 2014 John Wiley & Sons, Ltd.
These catalysts showed smoothly catalytic performance towards the Suzuki‐Miyaura reactions of the electron‐reach and electron‐poor aryl chlorides.
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