Process for the preparation of pure tolutriazoles

Details Process for the preparation of pure tolutriazoles Process for the preparation of pure tolutriazoles

1974-10-08

1976-07-20

Coughlan, Jr., Paul M.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D24916

Patent

active

039706672

ABSTRACT:
The process for the preparation of tolutriazoles by diazotation of toluylene-o-diamines and subsequent ring closure to form the tolutriazole ring, was improved and the tolutriazoles are now obtained in a simpler way and in a pure form. The improvement comprises dissolution of the tolutriazoles without preceding isolation after their synthesis by means of an alkaline agent, preferably a sodium hydroxide solution of 20 - 33% strength, and subsequent precipitation at a pH of from 4.5 to 6 by addition of a mineral acid, preferably nitric acid or hydrochloric acid, and avoids a subsequent technically complicated and expensive purification process as well as the use of organic solvents. The tolutriazoles obtained according to this novel process are sufficiently pure for the use as corrosion inhibition.

REFERENCES:
patent: 2861078 (1958-11-01), Miller et al.
patent: 3564001 (1971-02-01), Long
patent: 3639431 (1972-02-01), Meteer et al.
patent: 3732239 (1973-05-01), Spatz et al.

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