Process for the preparation of aromatic carboxylic acids
US5081252A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 5, 1989 |
| Grant date | Jan 14, 1992 |
| Priority date | — |
| Expiry date | Jun 5, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D209/88
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A process for the preparation of aromatic carboxylic acids or their salts comprises heating carboxyl-free aromatic compounds and aromatic carboxylic acid salts whose basic structures differ from those of the aromatic compounds, or heating polycyclic aromatic compounds with three or more rings and monocyclic or bicyclic aromatic carboxylic acid salts, under carbon dioxide pressure in the presence of one or more metal compounds selected from group (a) of compounds of zinc, cadmium, and thallium and one or more compounds selected from group (b) of compounds of cesium, Group II metals, And Group IIIa metals to effect the intermolecular transfer of the carboxyl groups.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.