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

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

Research output: Contribution to journalArticle

66 Citations (Scopus)

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 - 2007

Fingerprint

Epoxidation
Catalyst supports
Polymers
Catalysts
Centrifugation
Enantioselectivity
Oxidants
Organic solvents
Catalysis
Metal ions
Catalyst activity
Water
disalicylaldehyde ethylenediamine
catechol

Keywords

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

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Bis(catechol)salen]MnIII coordination polymers as support-free heterogeneous asymmetric catalysts for epoxidation. / Cho, So Hye; Gadzikwa, Tendai; Afshari, Mitra; Nguyen, SonBinh T.; Hupp, Joseph T.

In: European Journal of Inorganic Chemistry, No. 31, 2007, p. 4863-4867.

Research output: Contribution to journalArticle

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AU - Gadzikwa, Tendai

AU - Afshari, Mitra

AU - Nguyen, SonBinh T.

AU - Hupp, Joseph T

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AB - 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.

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