Process for the recovery of dihydroxybiaryl compounds
US7002046B2 · kind B2 · utility
0Cited by
2References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2003 |
| Grant date | Feb 21, 2006 |
| Priority date | — |
| Expiry date | Jun 14, 2024 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/64
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for preparing and isolating dihydroxybiaryl compounds, such as 4,4′-dihydroxybiphenyl, is disclosed. The alkali metal salt of the dihydroxybiaryl compound is protonated with the monohydroxyaryl halide compound initially used in the reductive coupling reaction which produced the alkali metal salt. In addition, the alkali metal salt of the monohydroxyaryl halide compound is produced by the process, which can then be recycled as the base and monohydroxyaryl halide in a further reductive coupling reaction to form the alkali metal salt of the dihydroxybiaryl compound.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.