Process for the preparation of 2-mercaptobenzothiazole

Details Process for the preparation of 2-mercaptobenzothiazole Process for the preparation of 2-mercaptobenzothiazole

1979-03-26

1982-02-16

Daus, Donald G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

546176, 564416, 568949, C07D27772

Patent

active

043160310

ABSTRACT:
A process for the preparation of 2-mercaptobenzothiazole is disclosed. The process comprises heating a reaction mixture comprising nitrosobenzene, hydrogen sulfide and carbon disulfide in a molar ratio of about 1:1.5 to 4:1 to 3, respectively, to a temperature from about 200 to about 300.degree. C., for a time sufficient to convert at least a portion of the reactants into 2-mercaptobenzothiazole. In an alternative process, there is first reacted nitrosobenzene with hydrogen sulfide in a molar ratio of about 1:1.5 to 4, at a temperature from about 20 to about 100.degree. C. for a period of time sufficient to substantially reduce the nitrosobenzene, and subsequently reacting the resulting product mixture with from about 1 to about 3 mole equivalents of carbon disulfide per mole of originally charged nitrosobenzene, at a temperature from about 200.degree. C. to about 300.degree. C.

REFERENCES:
patent: 1631871 (1927-06-01), Kelly
patent: 1785656 (1930-12-01), Sebrell et al.
patent: 2001587 (1935-05-01), Semon et al.
patent: 2247894 (1941-07-01), Smith
patent: 3142705 (1964-07-01), Freytag et al.

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