Preparation of trialkoxybenzaldehydes
US4933498A · kind A · utility
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Key dates
| Filing date | Aug 7, 1989 |
| Grant date | Jun 12, 1990 |
| Priority date | — |
| Expiry date | Aug 7, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C45/71
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
3,4,5-Trialkoxybenzaldehydes, notably 3,4,5-triamethoxybenzaldehyde, are prepared by hydrolyzing 5-bromo-4-hydroxy-3-methoxybenzaldehyde with an alkali metal hydroxide, in water and in the presence of a copper catalyst, and then directly sequentially (i.e., without separating any reaction intermediates) etherifying the 4,5-dihydroxy-3-methoxybenzaldehyde thus produced with a lower alkyl halide, in an aqueous medium and at a pH maintained at a value of from 6 to 12, optionally in the presence of a catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.