Process for preparing 2-carboxy-5-nitrobenzenesulfonic acid and salts thereof by oxidation
US6127572A · kind A · utility
1Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 17, 1998 |
| Grant date | Oct 3, 2000 |
| Priority date | — |
| Expiry date | Aug 17, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C303/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention is directed to a simple process for the preparation of the product 2-carboxy-5-nitrobenzenesulfonic acid (=4-nitro-2-sulfo-benzoic acid) or a salt thereof. The product can be prepared by the oxidation reaction of 2-methyl-5-nitrobenzenesulfonic acid with metal hypochlorites in the presence of metal bases from the group consisting of hydroxides and carbonates, essentially with the exclusion of heavy metal salts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.