Process for the preparation of acyl isocyanates
AssigneeSociete Nationale des Poudres et Explosifs
InventorsJean-Pierre Senet, Serge Lecolier, Paul Caubere, Deng Min-Zhi
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Abstract
The invention relates to a process for the preparation of acyl isocyanates of formula ##STR1## 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 ##STR2## 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.
Claims9
A process for the preparation of acyl isocyanates of formula ##STR25## wherein R is methyl or ethyl;
- phenyl or naphthyl carrying the groups R.sup.1, R.sup.2 and R.sup.3, wherein R.sup.1 is hydrogen, fluorine, chlorine, C.sub.1 -C.sub.2 alkyl, C.sub.1 -C.sub.2 alkoxy, CF.sub.3, CCl.sub.3, CBr.sub.3 or OCF.sub.3, R.sup.2 is hydrogen, fluorine, chlorine, C.sub.1 -C.sub.2 alkyl, C.sub.1 -C.sub.2 alkoxy, CF.sub.3, CCl.sub.3, CBr.sub.3, or OCF.sub.3, R.sup.3 is hydrogen, fluorine, chlorine, C.sub.1 -C.sub.2 alkyl, CF.sub.3, CCl.sub.3, CBr.sub.3 or when it is not attached to a carbon neighboring the carbon bonded to the ##STR26## nitro or phenoxy, a furyl, thienyl or pyridyl;
- which consists of reacting an acyl halide of formula ##STR27## wherein R has the above meaning and X is fluorine, chlorine or bromine with a sodium or potassium cyanate in an inert solvent in the presence of at least one compound which is a tin (IV), zinc or nickel (II) halide.
Process according to claim 11 characterized in that the metal halide is a chloride.
Dependencies are inferred from the claim text.