Multiple bonds between transition metals and main-group elements part 168. 1 methyltrioxorhenium/Lewisbase catalysts in olefin epoxidation

Wolfgang A. Herrmann, Hao Ding, Roland M. Kratzer, Fritz E. Kühn, Joachim J. Haider, Richard W. Fischer

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

Methyltrioxorhenium(VII) (MTO) forms with H2O2 and Lewis bases, e.g., pyridine, a powerful, highly selective oxidant for olefins, both under mono-phase (alcohols as solvents) and biphasic conditions (CH2Cl2/H2O). Large excess of pyridine is required to maintain the catalytic activity due to rapid oxidation of pyridine to pyridine N-oxide, which reaction is catalyzed by MTO, too. The selectivity to epoxides, however, remains high throughout the course of the catalysis, since pyridine N-oxide also forms a highly selective but much less active co-catalyst with MTO/H2O2. Under two-phase conditions, the presence of the aqueous phase ensures high epoxidation activities due to rapid, efficient removal of the pyridine N-oxide.

Original languageEnglish
Pages (from-to)319-322
Number of pages4
JournalJournal of Organometallic Chemistry
Volume549
Issue number1-2
DOIs
StatePublished - 18 Dec 1997
Externally publishedYes

Keywords

  • Methyltrioxorhenium
  • Olefins
  • Pyridine

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