Enantiomeric epoxidation of 4-Chlorostyrene (cas 1073-67-2) with H2O2 catalysed by robust chloromanganese(III)-5,10,15,20-tetrakis-[2-chloro-6-(2,3,4,6-tetraacetyl-O-β-d
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Add time:08/10/2019 Source:sciencedirect.com
Three new chiral managanese(III) porphyrins bearing chloro and glucosyl substituents have been used as catalysts for enantiomeric epoxidation of 4-Chlorostyrene (cas 1073-67-2) in the presence of diluted hydrogen peroxide as oxygen donor. With such complexes enantiomeric excesses (22%) are obtained, in the presence of 4-tert-butylpyridine or 2-methylimidazole with a very low destruction of the catalysts (ca. 5%) after 4 h of epoxidation.
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