Process for the production of 2-aryl-4-acyl-1.3.4-oxdiazolones-(

Details Process for the production of 2-aryl-4-acyl-1.3.4-oxdiazolones-( Process for the production of 2-aryl-4-acyl-1.3.4-oxdiazolones-(

1984-06-18

1986-03-25

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

521 90, 521180, 521182, 521184, C07D27110, C08J 910

Patent

active

045784760

ABSTRACT:
A process for the production of 2-aryl-4-acyl-1.3.4-oxdiazolones-(5), in which an aromatic carboxylic acid hydrazide is reacted at a pH value of from 1.8 to 3.0 with phosgene in a mixture consisting of water and acetone at a temperature of from 0.degree. C. to 50.degree. C., subsequently the pH is increased to from 9.5 to 11.0, then about 100 mol % of a carboxylic acid chloride or about 50 mol % of a dicarboxylic acid chloride (based on mols of carboxylic acid hydrazide) is added and optionally from 10.sup.-4 to 1.0 mol % (based on mols of carboxylic acid hydrazide) of a tertiary amine or phosphine is added as a catalyst and the reaction is completed at a temperature from 0.degree. C. to 50.degree. C.

REFERENCES:
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patent: 4500653 (1985-02-01), Schmidt et al.
Chem. Ber. 82, pp. 121-123, (1949).
Schmidt et al., Chem. Abst. 102-204918q.
Schmidt et al., Chem. Abst. 102-185087z.
Chemical Abstracts, vol. 98, No. 8, 21, Feb., 1983, 54598t.
Chemical Abstracts, vol. 98, No. 18, 2, May, 1983, 143927s.
Chemical Abstracts, vol. 91, No. 19, 5, Nov., 1979, 156918v.

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