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US 4,064,151 AGranted
Halosilyl carbamates
AssigneeUnited Carbide Corporation
InventorsEddie Hedaya, Theodoropulos Spyros
Life of this patent
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Abstract
Isocyanates are prepared directly from amines in a facile process which involves the reaction with halosilyl compounds to form novel halosilyl carbamates. The isocyanate may then be derived from the carbamate intermediate by gentle heating. In accordance with one aspect of the invention, isocyanates can be formed which contain a further reactive functional moiety, such as hydroxyl, amino, mercapto, nitro, sulfonamido, amido, carboxyl or the like.
Claims4
Halosilyl carbamates having the formula:
- RNHCOOSiXY.sub.2
- wherein R forms as either an amine or an amine salt a base of sufficient strength to form a carbamate salt with carbon dioxide, X is halogen and Y is a member selected from the group consisting of halogen, hydrogen, lower alkyl, alicyclics, aryl, alkaryl and aralkyl, each having no more than about 10 carbon atoms.
Dependencies are inferred from the claim text.