Method of manufacturing aromatic urethanes

Details Method of manufacturing aromatic urethanes Method of manufacturing aromatic urethanes

1990-03-16

1992-07-14

Dees, Jose G.

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

Organic compounds

Carboxylic acid esters

560 25, 560 27, 560 28, 560 30, 560 31, 560 32, C07C26900, C07C27100

Patent

active

051304643

ABSTRACT:
A method of manufacturing aromatic urethanes utilizes a urea production process wherein a primary aromatic amine, an aromatic nitro-compound and carbon monoxide are made to react together in the presence of a catalyst and solvents, to produce N,N'-disubstituted urea, the solvlent used in the urea production process consisting at least partly of an amide or oxygen-containing sulfur compound, and having the functions of stabilizing the catalyst and preventing it from separating out in a solution, and of increasing the activity of the catalyst, the quantity of the solvent being sufficient to permit it to fulfill these functions effectively. The method additionally includes an aromatic urethane production process wherein the N,N'-disubstituted urea produced is made to react with an organic compound containing hydroxyl groups, to produce a primary aromatic amine and aromatic urethane, the primary aromatic amine being separated to obtain the aromatic urethane.

REFERENCES:
patent: 4678856 (1987-07-01), Ikariya et al.
patent: 4705883 (1987-11-01), Grate et al.
patent: 4709073 (1987-11-01), Grate et al.

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