可溶性铜盐配合物Cu(OH)42-氧化扁桃酸制备香兰素

Oxidation of mandelic acid to vanillin by a soluble Cu(OH)42- complex

摘要:

以可溶性铜盐配合物Cu(OH)42-作为氧化剂，选择性氧化扁桃酸制备香兰素。当二价铜盐CuSO4•5H2O与扁桃酸的摩尔比为2.5，体系pH为13.5，温度为95℃，反应时间为8h，香兰素收率可达95.6%。二价铜盐在H2SO4溶液中由H2O2氧化Cu2O再生，再生后的二价铜盐的活性无明显下降，10次循环后香兰素的收率仍可达95.4%。

Abstract:

Mandelic acid was oxidized into vanillin by utilizing a soluble Cu(II) complex. When the molar ratio of CuSO4.5H2O to mandelic acid was 2.5, pH value was 13.5, reaction temperature was 95℃ and reaction time was 8 h, the oxidation yield reached 95.6%. The copper (II) salt can be efficiently recovered in H2SO4 solution by the oxidation of Cu2O in the presence of H2O2, and the activity of the regenerated copper (II) salt has no significant decrease. The yield of vanillin had almost no change each time, and kept at about 95.4% after ten cycles.