Efficient olefin epoxidation by robust re4 cluster-supported MnIII complexes with peracids: Evidence of simultaneous operation of multiple active oxidant species, Mnv=O, MnIV=O, and MnIII-OOC(O)R

Sun Hwa Lee, Li Xu, Byeong Kwon Park, Yuri V. Mironov, Soo Hyun Kim, Young Ju Song, Cheal Kim, Youngmee Kim, Sung Jin Kim

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40 Scopus citations

Abstract

Two new tetranuclear chalcocyanide cluster complexes, [(Mn(SaloPh)H 2O}4Re4Q4(CN)12] ·4CH3OH· 8 H2O (saloph = N,N'-o-phenylenebis-(salicylidenaminato), Q=Se (1-Se), Te (2-Te)), have been synthesized by the diffusion of a methanolic solution of [PPh4] 4[Re4Q4(CN)12] into a methanolic solution of [Mn(saloph)]+. The structure of 2-Te has been determined by X-ray crystallography. These rhenium cluster-supported [Mn III(saloph)] complexes have been found to efficiently catalyze a wide range of olefin epoxidations under mild experimental conditions in the presence of meta-chloroperbenzoic acid (mCPBA). Olefin epoxidation by these catalysts is proposed to involve the multiple active oxidants MnV=O, Mn IV=O, and MnIIIOOC(O)R. Evidence in support of this interpretation has been derived from reactivity and Hammett studies, H 218Oexchange experiments, and the use of peroxyphenylacetic acid as a mechanistic probe. Moreover, it has been observed that the participation of MnV= O, MnIV=O, and Mn III-OOC(O)R can be controlled by changing the substrate concentration. This mechanism provides the greatest congruity with related oxidation reactions that employ certain Mn complexes as catalysts.

Original languageEnglish
Pages (from-to)4678-4685
Number of pages8
JournalChemistry - A European Journal
Volume16
Issue number15
DOIs
StatePublished - 19 Apr 2010

Keywords

  • Cluster compounds
  • Epoxidation
  • Manganese
  • Rhenium

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