Production of isocyanates

Details Production of isocyanates Production of isocyanates

C - Chemistry, Metallurgy

07

C

260/455

C07C 207/00 (2006.01) C07D 271/08 (2006.01) C07D 271/12 (2006.01) C08G 18/75 (2006.01) C08G 18/81 (2006.01)

Patent

CA 1047519

ABSTRACT OF THE DISCLOSURE A furoxan, especially one in which the furoxan ring is fused to a strained aliphatic ring system, is heated in the presence of sulphur dioxide to give an isocyanate. The process enables furoxans, such as di- cyclopentadiene furoxan, which ring-open at temperatures <180°C to be converted into isocyanates. In the absence of sulphur dioxide, may be difficult to control the reaction and, in some cases, no isocyanate is obtained. Diisocyanates prepared by the process may be converted into polyurethanes by reaction with suitable hydroxylic compounds.

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