Production of 2-hydroxynaphthalene-3-carboxylic acid
US4038309A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1975 |
| Grant date | Jul 26, 1977 |
| Priority date | — |
| Expiry date | Dec 22, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/15
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The production of 2-hydroxynaphthalene-3-carboxylic acid by heating sodium .beta.-naphtholate in the presence of an araliphatic compound containing two aromatic radicals and/or in the presence of an aromatic ether having at least one aromatic radical etherified with an aliphatic, cycloaliphatic or araliphatic radical at a temperature of at least 200.degree. C, reaction with carbon dioxide and reaction of the salt formed with acid. The resultant 2-hydroxy-naphthalene-3-carboxylic acid is a starting material for the production of dyes, a coupling component of surface coating colors and chrome dyes and also a developer for diazotizable dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.