Process for the preparation of aromatic hydroxy compounds
US4657707A · kind A · utility
1Cited by
6References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 22, 1985 |
| Grant date | Apr 14, 1987 |
| Priority date | — |
| Expiry date | May 22, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09B1/08
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The invention relates to a process for the preparation of aromatic hydroxy compounds, starting from the corresponding halogenated aromatic compounds and replacing the halogen atom or atoms by the hydroxyl group. The process comprises converting the halogenated aromatic compound into the hydroxy compound by treatment with concentrated sulfuric acid, with the addition of an aldehyde and at elevated temperature. The aromatic hydroxy compounds are used as intermediates, for example for the manufacture of disperse and vat dyes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.