Process for the production of 1-substituted-3-hydroxy-5-chloro-1

Details Process for the production of 1-substituted-3-hydroxy-5-chloro-1 Process for the production of 1-substituted-3-hydroxy-5-chloro-1

Filed on

1979-07-05

Date issued

1981-02-24

Examiner

Rollins, Alton D.

Patent Class

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

SubClass

Organic compounds

SubSubClass

Heterocyclic carbon compounds containing a hetero ring...

Other Related Categories

C07D24912

Type

Patent

Status

active

Patent number

042529654

Description

ABSTRACT:
An improved process is provided for the production of 1-substituted-3-hydroxy-5-chloro-1,2,4-triazoles which involves reacting in dilute solution a 1-substituted-1-cyanohydrazine with phosgene in tetrahydrofuran as the specific inert solvent, treating the reaction mixture with anhydrous ammonia to form an ammonium salt of the 1,2,4-triazole, said ammonium salt being insoluble in tetrahydrofuran, and liberating from said isolated salt the 1,2,4-triazole in yields from about 85 to 92% of theory and in very pure state by treating said salt with an acid. The 1,2,4-triazoles are valuable intermediates in the manufacture of pesticides.

REFERENCES:
patent: 3867396 (1975-02-01), Dawes et al.
patent: 3992398 (1976-11-01), Bohner et al.

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