Well-defined ruthenium olefin metathesis catalysts: Mechanism and activity

Eric L. Dias, SonBinh T. Nguyen, Robert H. Grubbs*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

662 Scopus citations

Abstract

Several ruthenium-based olefin metathesis catalysts of the formula (PR3)2X2Ru=CHCHCPh2 have been synthesized, and relative catalyst activities were determined by monitoring the ring-closing metathesis of the acyclic diene diethyl diallylmalonate. The following order of increasing activity was determined: X = I < Br < Cl and PR3 = PPh3 << P(i)Pr2Ph < PCy2Ph < P(i)Pr3 < PCy3. Additional studies were conducted with the catalyst (PCy3)2-Cl2Ru=CH2 to probe the mechanism of olefin metathesis by this class of catalysts. The data support a scheme in which there are two competing pathways: the dominant one in which a phosphine dissociates from the ruthenium center and a minor one in which both phosphines remain bound. Higher catalyst activities could be achieved by the addition of CuCl to the reaction.

Original languageEnglish (US)
Pages (from-to)3887-3897
Number of pages11
JournalJournal of the American Chemical Society
Volume119
Issue number17
DOIs
StatePublished - Apr 30 1997

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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