Nuclear hydrogenation of n-aryl carbamates

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

1975-09-04

1978-01-17

Garner, Vivian

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

560 5, C07C12506

Patent

active

040692400

ABSTRACT:
N-Alicyclic carbamates, useful in making polyurethanes, 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.degree. C. for 1.3 hours under a pressure of 500-800 psi, to form dimethyl 4,4'-methylenedicyclohexylcarbamate. Acid activation of catalyst is a feature of the invention.

REFERENCES:
patent: 3511875 (1970-05-01), Brantley
patent: 3567764 (1971-03-01), Brantley
patent: 3600426 (1971-08-01), Grant et al.
patent: 3691234 (1972-09-01), Kiefer et al.
patent: 3699149 (1972-10-01), Yamamura et al.
patent: 3867443 (1975-02-01), Malz, Jr. et al.
Scopes et al., J. Chem. Soc., 1972, 2810-2811.
Weaver et al., Chem. and Ind., 4, pp. 187-188 (1973).
Weaver et al., Preprints, General Papers, Div. of Petrol. Chem., 18 (1), pp. 196-199 (1973).

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