Process for the preparation of isocyanate derivatives of...

Details Process for the preparation of isocyanate derivatives of... Process for the preparation of isocyanate derivatives of...

C - Chemistry, Metallurgy

07

C

260/455

C07C 275/06 (2006.01)

Patent

CA 1123449

GW 31835 PROCESS FOR THE PREPARATION OF ISOCYANATE DERIVATIVES OF ALIPHATIC, CYCLOALIPHATIC AND ARALIPHATIC COMPOUNDS ABSTRACT OF THE DISCLOSURE A process for the preparation of derivatives of aliphat- ic, cycloaliphatic, and araliphatic compounds containing from 1 to 3 isocyanate groups bonded to from 1 to 3 secondary or tertiary carbon atoms, or a combination thereof, is disclosed. The process comprises reacting a compound of the formula R.- (CO - NHCl)n, wherein R represents an aliphatic, cycloaliphatic, or araliphatic radical, with a tertiary amine having a PKa greater than 7, at a temperature from about 20 to about 180°C, in an inert solvent, to form a compound of the formula R - (N = C = 0)n, wherein the isocyanate groups are bonded to secondary or tertiary carbon atoms.

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