Method for preparation of para-brominated hydroxyaromatic compounds
US6982356B2 · kind B2 · utility
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27Claims
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Key dates
| Filing date | Sep 17, 2003 |
| Grant date | Jan 3, 2006 |
| Priority date | — |
| Expiry date | Dec 25, 2023 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method for preparing hydroxyaromatic compounds brominated in the para-position, such as p-bromophenol, is disclosed. The method yields overall high process selectivity through isomeric equilibration and separation of the brominated products, thereby eliminating the need for high para selectivity in the products of catalytic oxybromination reactions of hydroxyaromatic compounds using oxygen, a bromine source, and an acidic medium in the presence of a metal catalyst. Furthermore, the invention provides an efficient method for recycling the metal catalyst, as well as reagents used in the bromination, to further reactions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.