Enhanced activity of enantioselective (salen)Mn(III) epoxidation catalysts through supramolecular complexation

Gregory A. Morris, Son Binh T. Nguyen*, Joseph T. Hupp

*Corresponding author for this work

Research output: Contribution to journalArticle

49 Scopus citations

Abstract

(Salen)Mn(III) catalysts show increased turnover numbers in the catalytic asymmetric epoxidation of conjugated olefins upon addition of bulky Lewis acids (LA) such as zinc tetraphenylporphyrin (ZnTPP). Up to 3-fold increase in total catalytic activity and at least a 20-fold increase in catalyst stability was observed with a (salen)Mn catalyst bearing pendant 5,5′-bis-pyridyl groups. This latter enhancement is primarily attributed to formation of a coordination triad, which provides steric protection for the catalyst from bimolecular decomposition. Supramolecular complex formation enhanced the catalyst's stability without compromising its enantioselectivity.

Original languageEnglish (US)
Pages (from-to)15-20
Number of pages6
JournalJournal of Molecular Catalysis A: Chemical
Volume174
Issue number1-2
DOIs
StatePublished - Oct 1 2001

Keywords

  • Asymmetric epoxidation
  • Catalytic epoxidation
  • Manganese
  • Salen
  • Supramolecular chemistry

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology
  • Physical and Theoretical Chemistry

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