Process for the preparation of a mixture of alkylated phenothiazines and diphenylamines
US6407231B1 · kind B1 · utility
1Cited by
5References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 5, 2000 |
| Grant date | Jun 18, 2002 |
| Priority date | — |
| Expiry date | Jul 5, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D279/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
This invention relates to a novel, technically advantageous process for the preparation of a mixture of alkylated phenothiazines and diphenylamines. Starting from diphenylamine, this is reacted with elemental sulfur in the presence of iodine, and the substance mixture of diphenylamine and phenothiazine is treated with an olefin in the presence of an acid catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.