Process for the production of diurethanes and their use for the

Details Process for the production of diurethanes and their use for the Process for the production of diurethanes and their use for the

1994-12-02

1998-04-28

Shippen, Michael L.

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

Organic compounds

Carboxylic acid esters

560158, C07C26100

Patent

active

057446334

ABSTRACT:
A new process for the production of high purity (cyclo)aliphatic diurethanes from (cyclo)aliphatic diamines, alcohols and urea in a multistep reaction in which (1) urea is reacted with alcohol with elimination of ammonia, (2) diamine is then introduced into the reaction mixture, optionally in the form of a solution in alcohol, and reacted with continuous release of ammonia and (3) the reaction mixture is freed from volatile components by distillation. The diurethanes produced by this process are useful as starting materials for the production of the corresponding diisocyanates by thermal urethane cleavage.

REFERENCES:
patent: 2409712 (1946-10-01), Schweitzer
patent: 2806051 (1957-09-01), Brockway
patent: 4388238 (1983-06-01), Heitkamper et al.
patent: 4388246 (1983-06-01), Sundermann et al.
patent: 4430505 (1984-02-01), Heitkamper
patent: 4497963 (1985-02-01), Merger
patent: 4596678 (1986-06-01), Merger et al.
patent: 4596679 (1986-06-01), Hellbach et al.
patent: 4611079 (1986-09-01), Merger et al.
patent: 4692550 (1987-09-01), Engbert et al.
patent: 4713476 (1987-12-01), Merger et al.
patent: 4851565 (1989-07-01), Merger et al.
patent: 5087739 (1992-02-01), Bohmholdt et al.
patent: 5284969 (1994-02-01), Hauner et al.
ADAMS, Chemical Reviews, vol. 65, pp. 567-602, 1965.
Ault, "Techniques and Experiments for Organic Chemistry," 4th Ed., pp. 304-306, 1983.

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