离子液体相转移催化氧化苯甲醛制备苯甲酸

Ionic liquid as phase transfer catalyst for oxidation of benzaldehyde to prepare benzoic acid

以N-甲基咪唑、四氟硼酸铵、正丁醇、溴化钠为主要原料合成了1-正丁基-3-甲基咪唑四氟硼酸咪唑盐型离子液体。以该离子液体作相转移催化剂研究了双氧水氧化苯甲醛制备苯甲酸的反应。结果表明,该氧化反应中加入离子液体可起到溶剂及相转移催化剂的作用,当反应5 h时,苯甲醛可达最大转化率88%。反应后离子液体可回收再利用。

Taking N-methyl imidazole,ammonium tetrafluoroborate and n-butanol,sodium bromide as reactants,1-butyl-3-methyll imidazolium tetraflurooborate ionic liquid were synthesized.Then using the ionic liquid synthesized as the phase transfer catalyst,hydrogen peroxide as oxidant,benzoic acid was prepared by oxidizing benzaldehyde.The results showed this kind of ionic liquid could be used as solvent and phase-transfer catalyst.The conversion rate of benzaldehyde was 88% when the reaction time was 5 h.Finally,ionic liquids will be recovered in order to recycle.