Patent · US Expired

Process for the preparation of 2-mercaptobenzothiazole

US4316031A · kind A · utility

4Cited by

5References

11Claims

0Family size

Assignee

Akzona Incorporated · US

Inventors

Manfred Bergfeld · Zell am Harmersbach, DE
Hans Zengel · Kleinwallstadt, DE
Heinz Praetorius · Lendersdorf, DE

Key dates

Filing date	Mar 26, 1979
Grant date	Feb 16, 1982
Priority date	—
Expiry date	Mar 26, 1999

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D277/72
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.