Method for producing biphenyl and its derivatives
US6914152B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 2, 2002 |
| Grant date | Jul 5, 2005 |
| Priority date | — |
| Expiry date | Oct 2, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C2531/22
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for producing biphenyl and its derivative comprising oxidatively coupling a benzene aromatic compound in the presence of a catalyst comprising a palladium salt, a copper salt, and a bidentate ligand compound capable of forming a complex with the palladium salt via the nitrogen atom and the oxygen atom in the molecule thereof in an atmosphere containing molecular oxygen. In particular, an improved method for selectively producing an asymmetrically substituted biphenyl derivative, such as a 2,3,3′,4′-biphenyltetracarboxylic acid tetraester, which comprises oxidatively coupling a substituted aromatic compound, such as a phthalic diester, in the presence of the catalyst in an atmosphere containing molecular oxygen without replenishing with a ligand.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.