Process for manufacturing chlorothianthrenes
US3989715A · kind A · utility
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12Claims
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Key dates
| Filing date | Aug 1, 1975 |
| Grant date | Nov 2, 1976 |
| Priority date | — |
| Expiry date | Aug 1, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D339/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Thianthrene in monochlorotoluene, is reacted with excess chlorine in the presence of a Lewis acid catalyst, to yield a mixture of chlorothianthrenes, the major component of which is 2,3,7,8-tetrachlorothianthrene. Recrystallization of the chlorothianthrene mixture from a suitable solvent, such as tetrahydrofuran yields 2,3,7,8-tetrachlorothianthrene of greater than 90 percent purity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.