Process for the preparation of asymmetrically substituted ureas

Details Process for the preparation of asymmetrically substituted ureas Process for the preparation of asymmetrically substituted ureas

1990-07-12

1991-08-27

Richter, Johann

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

Organic compounds

Four or more ring nitrogens in the bicyclo ring system

548538, 564 56, 564 57, 564 61, C07D26530, C07D20722, C07C27506, C07C27524

Patent

active

050434446

ABSTRACT:
Process for the preparation of asymmetrically substituted ureas by reaction of a gaseous mixture of isocyanic acid and ammonia having a temperature of 260.degree. to 600.degree. C. with a primary or secondary amine.

REFERENCES:
patent: 4354040 (1982-10-01), Inoue et al.
patent: 4616094 (1986-10-01), Bosho et al.
patent: 4931595 (1990-06-01), Rasshofer
Liebig's Annalen Der Chemie, vol. 364, pp. 129-146 (1909).

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