Synthesis of isocyanate precursors from primary formamides
AssigneeArco Chemical Technology, L.P.
InventorMahmoud K. Faraj
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Abstract
A selective process for the production of unsymmetric carbamates and ureas is disclosed. In the process, a primary formamide is reacted with a dialkyl amine or an alcohol in the presence of a Group VIII transition metal catalyst. The unsymmetric carbamates and ureas are useful precursors to isocyanates.
Claims14
A selective process for making a carbamate, said process comprising reacting a primary formamide with an alcohol in the presence of a Group VIII transition metal compound at a temperature and for a time sufficient to produce the carbamate.
A selective process for making an aromatic carbamate, said process comprising reacting a primary aromatic formamide with a an alcohol in the presence of a Group VIII transition metal compound at a temperature greater than about 150.degree. C. for a time sufficient to produce the aromatic carbamate.
Dependencies are inferred from the claim text.