Abstract
Conversion of epoxides to thiiranes with ammonium thiocyanate or thiourea in the presence of poly(4-vinyl pyridine)-Ce(OTf)4 as catalyst and under non-aqueous condition is reported. Stereospecific conversion of R-(+)-styrene oxide to S-(-)-styrene sulfide was achieved in high optical purity. The polymer can be easily reloaded.
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