Zhao Shi-kui
2006
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Journal
Journal of Xuzhou Normal University
Abstract
3,4-Dihydroxybenzaldehyde was prepared from vanillin by demethylation.Optimum reaction conditions were found out.Molar ratio of catalyst anhydrous aluminum chloride,pyridine and methylene chloride to vanillin is 1.4∶3.2∶4.6∶1.At refluxing temperature at one atmosphere pressure,the yield was up to 96.0% and the purity was 99.8%.The reaction is analyzed according to the theory of hard-soft-acid-base.