Process for the preparation of acyl isocyanates

Details Process for the preparation of acyl isocyanates Process for the preparation of acyl isocyanates

C - Chemistry, Metallurgy

07

C

260/295, 260/537

C07C 265/14 (2006.01) C07C 273/18 (2006.01) C07D 213/78 (2006.01) C07D 307/68 (2006.01)

Patent

CA 1339804

The invention relates to a process for the preparation of acyl isocyanates of formula (see fig. I) in which R is an alkyl radical, a substituted or unsubstituted naphthyl or phenyl radical or a substituted or unsubstituted aromatic heterocyclic radical, which consists in reacting an acyl halide of formula (see fig. II), in which R has the above meaning and X denotes a fluorine, chlorine or bromine atom, with a sodium or potassium cyanate in the presence of a compound chosen from tin(IV), zinc or nickel(II) halides. The acyl isocyanates thus prepared are very useful for forming ureas or carbamates.

594547

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