Silica and polymer-tethered Pd-SCS-pincer complexes: Evidence for precatalyst decomposition to form soluble catalytic species in Mizoroki-Heck chemistry

Kunquan Yu, William Sommer, Marcus Weck, Christopher W. Jones

Research output: Contribution to journalArticle

Abstract

Palladium(II)-SCS-pincer complexes have been covalently immobilized on porous silica and polynorbornene supports and evaluated in the Mizoroki-Heck reaction of iodobenzene and n-butyl acrylate. Kinetic experiments and poisoning studies indicate that the pincer complexes decompose under reaction conditions via rupture of the palladium-ligand bonds to liberate active Pd(0) homogeneous species. There is no evidence for catalysis by the intact Pd(II) pincer complex under any conditions evaluated, ruling out a Pd(II)-Pd(IV) catalytic mechanism that has been postulated for palladacycle catalysts under the conditions used here.

Original languageEnglish (US)
Pages (from-to)101-110
Number of pages10
JournalJournal of Catalysis
Volume226
Issue number1
DOIs
StatePublished - Aug 15 2004

Keywords

  • Catalyst
  • Heck
  • Leaching
  • Organometallic
  • Palladium
  • Pincer
  • Silica

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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