poly(n- bromosuccinimide) (pnbs) as a mild, efficient, non-acidic, polymeric and heterogeneous catalyst applied for easy conversion of epoxides into thiiranes by treatment with kscn or (nh2)2cs at room temperature

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