Production of 2-hydroxynaphthalene-3-carboxylic acid
US4032568A · kind A · utility
2Cited by
6References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 24, 1975 |
| Grant date | Jun 28, 1977 |
| Priority date | — |
| Expiry date | Sep 24, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/15
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
2-HYDROXYNAPHTHALENE-3-CARBOXYLIC ACID IS PRODUCED BY HEATING A MIXTURE OF POTASSIUM .beta.-NAPHTHOLATE AND SODIUM .beta.-NAPHTHOLATE TO A TEMPERATURE OF AT LEAST 180.degree. C, reacting it with carbon dioxide and treating the salt formed with an acid. The product is a dye intermediate, a coupling component of surface coating dyes and chrome dyes, and a developer for diazo dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.