Anthracene-induced turnover enhancement in the manganese porphyrin-catalyzed epoxidation of olefins

Melissa L. Merlau, So Hye Cho, Shih Sheng Sun, Son Binh T. Nguyen, Joseph T. Hupp

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Anthracene and related compounds function as lifetime-extending cofactors in the (mesotetraphenylporphine)MnIII chloride-catalyzed epoxidation of olefins. An experiment with a chiral porphyrin catalyst shows that enantioselectivity is preserved in the presence of the cofactor. Additional experiments show that (a) turnover number enhancement is greatest for the least reactive substrates, (b) derivatization of anthracene at the 9 and 10 positions largely eliminates the enhancement effect, and (c) anthracene is ultimately converted to anthraquinone. The origin of the observed enhancements is in the reaction of anthracene with the normally unreactive dimeric oxo-bridged form of the catalyst. This reaction, which produces anthraquinone, regenerates the catalytically active monomeric form of the manganese porphyrin.

Original languageEnglish
Pages (from-to)5523-5529
Number of pages7
JournalInorganic Chemistry
Volume44
Issue number15
DOIs
Publication statusPublished - Jul 25 2005

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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