Process for the preparation of 2-mercaptobenzothiazole

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

C - Chemistry, Metallurgy

07

D

260/309.5

C07D 277/72 (2006.01)

Patent

CA 1123838

GW 31827 PROCESS FOR THE PREPARATION OF 2-MERCAPTOBENZOTHIAZOLE ABSTRACT OF THE DISCLOSURE 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°C, fc. a time sufficient to convert at least a portion of the reactants into 2-mercaptoben- zothiazole. 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°C for a period of time sufficient to substantially reduce the nitrosoben- zene, 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°C to about 300°C.

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