Chiral salen Mn (III) immobilized on ZnPS-PVPA through alkoxyl-triazole for superior performance catalyst in asymmetric epoxidation of unfunctionalized olefins

Publication date: Available online 20 February 2019Source: Journal of Organometallic ChemistryAuthor(s): Jing Huang, Sirui Liu, Yan Ma, Jiali CaiAbstractChiral salen Mn (III) catalysts anchored onto ZnPS-PVPA via click chemistry are prepared and applied in asymmetric epoxidations of unfunctionalized olefins. Superior catalytic performances (conv%, up to>99; ee%, up to>99) are achieved in the epoxidations of α-methylstyrene, styrene, indene and 1-octene. According to 6-cyano-2,2-dimethylchromene and 6-nitro-2,2-dimethylchromene, configuration of epoxides are reversed. And then the catalysts are selective in not only oxidative systems, but also substrates. Moreover, superior reusability (yield, 82%; ee, 86%) after recycling for nine times could also be obtained, which provide the potential application in industry.Graphical abstractChiral salen Mn (III) anchored on ZnPS-PVPA through alkoxyl-triazole display superiorv catalytic ability either for the experimental scale reactions or for the large-scale reactions.

Source: Journal of Organometallic Chemistry - February 21, 2019 Category: Chemistry Source Type: research