Process for the preparation of N- and O-substituted diurethanes

Details Process for the preparation of N- and O-substituted diurethanes Process for the preparation of N- and O-substituted diurethanes

1984-12-05

1986-06-03

Helfin, Bernard

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

Organic compounds

Carboxylic acid esters

560 9, 560148, 560115, 560158, C07C125073, C07C125077

Patent

active

045931178

ABSTRACT:
Low molecular weight N- and O-substituted diurethanes and/or polyurethanes are prepared by reacting a diamine and/or polyamine containing a primary amino group with an N-aryl-0-alkyl urethane in the presence of at least one high boiling alcohol. This reaction may be carried out at a temperature of from 180.degree. to 350.degree. C. and a pressure of approximately 0.1 to 1,500 mbar. The arylamine corresponding to the N-ary-0-alkyl urethane which forms during this reaction is continuously removed from the reaction mixture.

REFERENCES:
patent: 4278805 (1981-07-01), Merger et al.
patent: 4290970 (1981-09-01), Merger et al.

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