Conversion of Epoxides to Thiiranes with Thiourea or Ammonium Thiocyanate Catalyzed with Poly(4-Vinyl Pyridine)-Ce(OTf)₄

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• The polymeric catalyst can be easily reloaded by treating the polymeric filtrate from the reaction mixture with excess of Ce(OTf)4 according to the procedure for the preparation of catalyst.The reloaded catalyst was found to have the same reactivity as before
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