Bromination of hydroxyaromatic compounds and further conversion to dihydroxyaromatic compounds
US7045666B2 · kind B2 · utility
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7References
19Claims
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Key dates
| Filing date | Jan 16, 2003 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Jan 16, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C37/62
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Brominated hydroxyaromatic compounds such as p-bromophenol are prepared by contacting a hydroxyaromatic compound with oxygen and a bromine source such as hydrogen bromide or an alkali metal or alkaline earth metal bromide in an acidic medium, in the presence of elemental copper or a copper compound as catalyst. The brominated product of this reaction may be converted alternately to a dihydroxyaromatic compound such as hydroquinone by hydrolyses, or a dihydroxybiphenyl compound such as 4,4′-dihydroxybiphenyl by reductive coupling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.