Nuclear hydrogenation of n-aryl carbamates

Details Nuclear hydrogenation of n-aryl carbamates Nuclear hydrogenation of n-aryl carbamates

B - Operations, Transporting

01

J

260/469

B01J 23/46 (2006.01) B01J 23/40 (2006.01)

Patent

CA 1075259

Abstract of the Disclosure N-Alicyclic carbamates, useful in making poly- urethanes, are prepared by nuclear hydrogenation of an N-aryl carbamate using a group VIII transition metal catalyst. E.g., dimethyl 4,4'-methylenedicarbanilate is contacted with hydrogen and ruthenium catalyst in 2-propanol medium, at 50°C. for 1.3 hours under a pressure of 500-800 psi, to form dimethyl 4,4'-methylene- dicyclohexylcarbamate. Acid activation of catalyst is a feature of the invention.

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