IMPROVED PROCESS FOR PRODUCING 3,4,5-TRIMETHOXY-BENZALDEHYDE OF HIGH PURITY

摘要

Improved prepn. of high purity 3,4,5-methoxy-benzaldehyde from an acetal, formed by 5-bromo-vanillin or 3,5-di:bromo-4-hydroxy y-benzaldehyde-orthoformate and alcohols or glycols, with an alkaline-metal-methylate. The obtd. - syringaldehyde or its alkaline-metal-salt is methylated by di:methysulphate or methylchloride. A 3,4,5-tri:methoxy-benzaldehyde deriv. or its alkalinee metal salt is obtd. and subjected to decompsn. in aq. acid.