Preparation of 2-chlorobenzthiazole
US4764621A · kind A · utility
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6Claims
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Key dates
| Filing date | Aug 26, 1983 |
| Grant date | Aug 16, 1988 |
| Priority date | — |
| Expiry date | Aug 26, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D277/68
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of 2-chlorobenzthiazole comprising reacting benzthiazole with elementary chlorine in an inert, boiling solvent in the presence of a catalyst. Advantageously the solvent is phosphorus oxychloride or chlorobenzene, the catalyst is iron-III chloride or aluminum chloride and phosphorus trichloride or pyridine is also present as a co-catalyst. The desired product is obtained in high yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.