Journal
ADVANCED SYNTHESIS & CATALYSIS
Volume 347, Issue 1, Pages 161-171Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsc.200404264
Keywords
biphasic catalysis; Heck reaction; immobilization; leaching; palladium; pincer complex
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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.
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