Bis(catechol)salen]MnIII coordination polymers as support-free heterogeneous asymmetric catalysts for epoxidation

So Hye Cho, Tendai Gadzikwa, Mitra Afshari, Son Binh T. Nguyen, Joseph T. Hupp

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Abstract

The formation of coordination polymers by the reaction of [bis(catechol)salen]MnIII with several di- and trivalent metal ions is reported. These polymers are insoluble in a wide range of organic solvents and water but can be dissolved upon addition of excess pyrocatechol. They function as enantioselective heterogeneous epoxidation catalysts and exhibit catalytic activity comparable to that of the homogeneous [bis(catechol)salen] MnIII building block alone when used for the enantioselective epoxidation of 2,2-dimethyl-2H-chromene. After catalysis, catalyst isolation from the reaction mixture can be readily achieved by centrifugation and decantation. Under practical oxidant concentrations, the cata lyst can be recycled up to ten times with little loss of activity and no loss of enantioselectivity.

Original languageEnglish
Pages (from-to)4863-4867
Number of pages5
JournalEuropean Journal of Inorganic Chemistry
Issue number31
DOIs
Publication statusPublished - Nov 16 2007

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Keywords

  • Asymmetric catalysis
  • Coordination polymers
  • Heterogeneous catalysis
  • Manganese
  • Salen ligands

ASJC Scopus subject areas

  • Inorganic Chemistry

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