Chiral Jacobsen's catalyst immobilized on zinc poly(styrene-phenylvinylphosphonate)-phosphate functionalized by diamine as highly efficient and reusable catalyst for alkene epoxidation

摘要

Chiral Jacobsen's catalyst anchored on zinc poly(styrene-phenylvinylphosphonate)-phosphate (ZnPS-PVPA) functionalized by diamines shows superior catalytic activities (conversion up to 99%; enantiomeric excess up to 99%) in the enantioselective epoxidations of unfunctional olefins with m-chloroperoxybenzoic acid and NaIO4 as oxidants. The whole chiral salen Mn(III) catalyst, including the ZnPS-PVPA support and the linker as well as chiral salen Mn ligand together contribute to the chirality of products. The heterogeneous catalyst has the potential for use in industry owing to superior stability (recycling nine times) and activity in large-scale reactions (such as 200 times).