Process for the preparation of 2,4-dinitrophenyl urea

Details Process for the preparation of 2,4-dinitrophenyl urea Process for the preparation of 2,4-dinitrophenyl urea

1979-12-20

1981-07-28

Waltz, Thomas A.

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

Organic compounds

Amino nitrogen containing

C07C12604

Patent

active

042811872

ABSTRACT:
2,4-Dinitrophenyl urea is obtained in a technologically simple manner with high yield, if 2,4-dinitro-1-chlorobenzene 1s reacted with cyanamide, advantageously in an excess amount, at a temperature at from about 55.degree. to 75.degree. C. to yield 2,4-dinitrophenyl cyanamide which is subsequently hydrolyzed without intermediate isolation in an aqueous acid medium at a temperature of from about 40.degree. to 75.degree. C. 2,4-Dinitrophenyl urea serves as starting compound for the preparation of 5-amino-benzimidazolones which may be employed, for example, when preparing azo compounds.

REFERENCES:
patent: 2826611 (1958-03-01), Fischback et al.
patent: 3119867 (1964-01-01), Lecher et al.
J. Prakt. Chemie 110, pp. 300-301, (1925).

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