Purification of 2-mercaptobenzothiazole

Details Purification of 2-mercaptobenzothiazole Purification of 2-mercaptobenzothiazole

1980-06-23

1982-08-10

Springer, David B.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548176, C07D27772

Patent

active

043439462

ABSTRACT:
A process for the purification of crude 2-mercaptobenzothiazole, prepared by reacting aniline, carbon disulfide and sulfur at elevated temperature and pressure is described. The process comprises the reaction of crude 2-mercaptobenzothiazole with 5-20%, preferably 10-12%, molar excess aqueous alkali metal hydroxide having a concentration of 3 to 20% by weight alkali metal hydroxide at 70.degree. to 90.degree. C. for 0.5-4 hours, with vigorous agitation, followed by filtration of the insoluble impurities and acidification of the filtrate with a non-oxidizing mineral acid, such as hydrochloric and sulfuric acids. The precipitated, filtered product is washed with water and collected in 98-100% yield and 95-98.5% purity.

REFERENCES:
patent: 2117120 (1938-05-01), Smith et al.
patent: 2137820 (1938-11-01), Williams et al.
patent: 2631153 (1953-03-01), Paul et al.
patent: 2730528 (1956-01-01), Weyker et al.

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