Process for the manufacture of thianthrene
US3997560A · kind A · utility
2Cited by
0References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1974 |
| Grant date | Dec 14, 1976 |
| Priority date | — |
| Expiry date | Nov 5, 1994 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D339/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Thianthrene is prepared by adding sulfur monochloride to an excess of benzene in the presence of aluminum chloride, and reacting at a temperature of 60.degree. to 80.degree. C to form thianthrene as an insoluble thianthrene-aluminum chloride complex; separating the complex by filtration, slurrying the complex in an inert organic liquid; treating the slurry with a Lewis base, such as ammonia to free the thianthrene from the complex and recovering a relatively high purity thianthrene product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.