Evidence that SCS Pincer Pd(II) Complexes are only Precatalysts in Heck Catalysis and the Implications for Catalyst Recovery and Reuse

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...

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Bibliographic Details
Published in:Advanced synthesis & catalysis 2005-01, Vol.347 (1), p.161-171
Main Authors: Yu, Kunquan, Sommer, William, Richardson, John M., Weck, Marcus, Jones, Christopher W.
Format: Article
Language:English
Subjects:
biphasic catalysis
Heck reaction
immobilization
leaching
palladium
pincer complex
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Summary: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 for catalysis by the intact amide‐linked SCS‐Pd(II) complexes under any conditions studied here.
ISSN:1615-4150
1615-4169
DOI:10.1002/adsc.200404264