Process for preparing isocyanates from urethanes by a novel...

Details Process for preparing isocyanates from urethanes by a novel... Process for preparing isocyanates from urethanes by a novel...

C - Chemistry, Metallurgy

07

C

C07C 263/04 (2006.01) C07C 265/00 (2006.01) C08G 18/02 (2006.01)

Patent

CA 2141643

Urethanes are converted to isocyanates by reaction with a chloro-, bromo- or iodo- borane compound and a tertiary amine in a nonpolar solvent. With the preferred borane compound, chlorocatecholborane, the reaction goes speedily and under gentle conditions to give the isocyanate in good yield. Also formed is a borate which can be readily converted to the borane compound, for reuse.

Les uréthanes sont convertis en isocyanates par réaction avec un chloro-, bromo- ou iodoborane et une amine tertiaire dans un solvant non polaire. Comme borane, on privilégie le chlorocatécholborane, qui donne une réaction rapide, dans des conditions douces, produisant l'isocyanate avec un bon rendement. Il se forme également un borate qui peut être facilement converti en borane pour réutilisation.

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