Preparation process for aromatic hydroxycarboxylic acid
US4950781A · kind A · utility
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12Claims
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Key dates
| Filing date | Nov 21, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Nov 21, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/15
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of aromatic hydroxycarboxylic acids by reacting alkali metal salts of phenol with carbon dioxide in organic phosphine oxides containing straight or branched alkyl groups having from 1 to 8 carbon atoms and phenyl groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.