Chlorination of nitrophenols
US4827047A · kind A · utility
2Cited by
2References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 7, 1988 |
| Grant date | May 2, 1989 |
| Priority date | — |
| Expiry date | Mar 7, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C201/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The chloronitrophenols, e.g., 2,6-dichloro-4-nitrophenol (a known agrochemical/pharmaceutical intermediate), are efficiently prepared by chlorinating ortho- or para-nitrophenol with gaseous chlorine, characteristically in the molten state, and in the presence of a catalytically effective amount of a primary, secondary or tertiary amine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.