Process for preparing n,n'-disubstituted urea using selenium-bas

Details Process for preparing n,n'-disubstituted urea using selenium-bas Process for preparing n,n'-disubstituted urea using selenium-bas

1999-09-13

2000-10-03

Killos, Paul J.

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

Organic compounds

Amino nitrogen containing

564 57, 564 58, 564 67, C07C27300

Patent

active

061275751

ABSTRACT:
A process is disclosed for preparing N,N'-disubstituted urea by reacting an amine and CO/O.sub.2 mixture gas in the presence of a catalyst system comprising at least one selenium compound selected from SeO.sub.2, (CH.sub.3 O)Se(O)(OH) and (CH.sub.3 CH.sub.2 O)Se(O)(OH), and M.sub.2 CO.sub.3 (M=alkali metal) as a co-catalyst. The process enables less active aromatic amine with a low reactivity as well as an aliphatic amine to be easily transformed into disubstituted urea avoiding the use of expensive precious metal catalysts.

REFERENCES:
patent: 4052454 (1977-10-01), Zajacek et al.
Kiyoshi, Kondo, et al., "A New Synthesis of Carbamates, The Reaction of Carbon Monoxide With Amine and Alcohol In the Co-Presence of Selenium and Triethylamine", Published by The Chemical Society of Japan, Chemistry Letters, pp. 373-374 (1961).
R.A. Franz, et al.; "A New Synthesis of Ureas, III, The Reaction of Aromatic Amines with Carbon Monoxide and Sulfur", J. Org. Chem, pp. 3309-3319, 3303, (1961).

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