Poly (N-bromosuccinimide) (PNBS) as a mild, efficient, non-acidic, polymeric and heterogeneous
catalyst was applied for simple conversion of epoxides into thiiranes by treatment with KSCN or (NH2)2CS
at room temperature. Aliphatic and aromatic epoxides converted into their corresponding thiiranes under
mild conditions. All reactions proceeded in short reaction times and afforded the corresponding products
in good to excellent yields. The catalyst could be recycled and reused for several times without any
deterioration in its activity. Advantages such as easy preparation of the catalyst, simple work up, excellent
yields of the products and recyclability of the catalyst makes this method more useful compared to the
known methodologies.
