Evidence that SCS Pincer Pd(II) Complexes are only Precatalysts in Heck Catalysis and the Implications for Catalyst Recovery and Reuse
作者： Kunquan Yu , William Sommer , John?M. Richardson , Marcus Weck , Christopher?W. Jones
关键词:
摘要: 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 evaluated in the Heck coupling of iodobenzene with n-butyl acrylate. Kinetic experiments poisoning studies indicate that all cases pincer merely act as precatalysts. Contrary to literature reports, there is no evidence for catalysis by intact amide-linked SCS-Pd(II) under any conditions studied here.
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