Novel process of alkoxy and aryloxy isothiocyanate preparation

Details Novel process of alkoxy and aryloxy isothiocyanate preparation Novel process of alkoxy and aryloxy isothiocyanate preparation

C - Chemistry, Metallurgy

07

C

C07C 331/32 (2006.01)

Patent

CA 2101193

Alkoxy and aryloxy isothiocyanates are produced by the reaction of a haloformate and an alkali or alkaline earth metal thiocyanate in the presence of water and (i) a catalyst comprising a six membered mononuclear or ten membered fused polynuclear aromatic, heterocyclic compound having 1 or 2 nitrogen atoms as the only hetero atoms in the ring and (ii) a co-catalyst comprising an alkali metal or alkaline earth metal salt of an acid having a pKa of about 10 -3 or below. The co-catalyst accelerates the reaction rate, increases product purity and reduces the adverse effects of impurities in certain grades of the thiocyanate reactants.

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