Production of 2-hydroxynaphthalene-3-carboxylic acid
US4020102A · kind A · utility
4Cited by
4References
22Claims
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Assignee
Inventors
Key dates
| Filing date | Sep 25, 1975 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Sep 25, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/48
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
2-Hydroxynaphthalene-3-carboxylic acid is prepared by the reaction of sodium-.beta.-naphtholate with carbon dioxide, extraction of the reaction mixture in the presence of water with benzene or a benzene derivative in a specific ratio and separation of the end product from the extracted mixture. The product is a starting material for the production of dyes and a coupling component in the manufacture of azo dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.