Process for preparation of 3,3',4,4'-biphenyltetracarboxylic acid salts
US4727185A · kind A · utility
5Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Jan 21, 2006 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/347
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
When a 4-halogenoorthophthalic acid salt is dissolved together with a base in an alkaline aqueous solution and the solution is heated in the presence of a catalyst comprising a noble metal supported on a carrier, a formic acid salt and a small amount of an aliphatic compound containing a hydroxyl group, a 3,3',4,4'-biphenyltetracarboxylic acid salt is obtained in a high yield.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.