Evidence that SCS pincer Pd (II) complexes are only precatalysts in Heck catalysis and the implications for catalyst recovery and reuse

…, W Sommer, JM Richardson, M Weck…

Index: Yu, Kunquan; Sommer, William; Richardson, John M.; Weck, Marcus; Jones, Christopher W. Advanced Synthesis and Catalysis, 2005 , vol. 347, # 1 p. 161 - 171

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Citation Number: 261

Abstract

Abstract SCS-pincer Pd (II) complexes have been covalently immobilized onto porous silica, cross-linked polymer (Merrifield resin) and soluble poly (norbornene) supports via either amide or urea linkages and evaluated in the Heck coupling of iodobenzene with n-butyl acrylate. Kinetic experiments and poisoning studies indicate that in all cases the pincer complexes merely act as precatalysts. Contrary to literature reports, there is no evidence ...