Bromination of substituted benzaldehydes
US4551558A · kind A · utility
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17Claims
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Key dates
| Filing date | Dec 24, 1984 |
| Grant date | Nov 5, 1985 |
| Priority date | — |
| Expiry date | Dec 24, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C47/575
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Substituted bromobenzaldehydes, e.g., 5-bromovanillin, are facilely prepared with overall avoidance of HBr by-product, by (i) first brominating the corresponding benzaldehyde with a less than stoichiometric amount of bromine, and (ii) completing said bromination reaction with a brominating couple which comprises (1) the hydrobromic acid generated in situ in the step (i) and (2) a bromide ion oxidizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.