Water → 6-Bromo-3,4-dimethoxybenzaldehyde

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Reaction Steps

3,4-Dimethoxybenzaldehyde (398.8 g) is dissolved in acetic acid (1.8 liter), and thereto is added dropwise bromine (136 ml) at room temperature over a period of four hours. The mixture is stirred overnight, and thereto is added dropwise slowly again bromine (60 ml), and the mixture is stirred overnight. The reaction solution is added to water (7 liters), and the precipitated crystals are collected by filtration, washed with water, and dissolved in chloroform (2 liters). The chloroform solution is washed, dried, concentrated, and the residue is crystallized from dilsopropyl ether to give 6-bromo-3,4-dimethoxybenzaldehyde (470 g) as a colorless crystal.

Provenance & Evidence