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

Gregory A. Morris, SonBinh T. Nguyen, Joseph T Hupp

Research output: Contribution to journalArticle

48 Citations (Scopus)

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

Fingerprint

epoxidation
Epoxidation
Complexation
catalysts
Catalysts
Bearings (structural)
Lewis Acids
Enantioselectivity
Alkenes
alkenes
Olefins
catalytic activity
Catalyst activity
Zinc
zinc
Mn-salen
Decomposition
decomposition
acids
Acids

Keywords

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

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Enhanced activity of enantioselective (salen)Mn(III) epoxidation catalysts through supramolecular complexation. / Morris, Gregory A.; Nguyen, SonBinh T.; Hupp, Joseph T.

In: Journal of Molecular Catalysis A: Chemical, Vol. 174, No. 1-2, 01.10.2001, p. 15-20.

Research output: Contribution to journalArticle

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