Selective oxidation of aldehydes by oxygen over macroporous alkaline resin,Reaction Chemistry & Engineering

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Selective oxidation of aldehydes by oxygen over macroporous alkaline resin
Reaction Chemistry & Engineering ( IF 3.4 ) Pub Date : 2022-08-06 , DOI: 10.1039/d2re00200k
Xiaojing Fu ₁ , Yuchan Han ₁ , Rui Chen ₁ , Qi Han ₁ , Rongfan Zhang ₁ , Jun Li ₁

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An OH-type macroporous strong-base resin was evaluated as a heterogeneous catalyst for the oxidation of aldehydes to the corresponding carboxylic acids by molecular oxygen. A wide range of aldehydes, such as aromatic, aliphatic and cyclohexyl aldehydes, were found to be oxidized to the goal acids with high yields in a short time. Neither metals, hazardous oxidants, nor cocatalysts were involved in the reaction system. Solvents, temperature and O₂ pressure may have a significant impact on the product distribution. These process parameters were tested to determine the optimal conditions for the oxidation of 3,5,5-trimethylhexanal. The yield of the goal 3,5,5-trimethylhexanoic acid reached 88.1% under 0.3 MPa of oxygen at 45 °C after a 40 minute reaction with acetonitrile as a solvent and the alkaline resin as the sole catalyst. Cycle tests of the catalyst showed that it was easy to separate and recycle the resin, indicating the good application prospects of the alkaline resin for the title reaction.

中文翻译：

大孔碱性树脂上氧对醛的选择性氧化

将 OH 型大孔强碱树脂作为非均相催化剂，用于通过分子氧将醛氧化成相应的羧酸。发现多种醛，如芳香醛、脂肪醛和环己醛，可以在短时间内以高产率氧化成目标酸。反应系统中不涉及金属、有害氧化剂和助催化剂。溶剂、温度和 O ₂压力可能会对产品分布产生重大影响。测试这些工艺参数以确定氧化 3,5,5-三甲基己醛的最佳条件。以乙腈为溶剂，碱性树脂为唯一催化剂，45℃、0.3MPa氧气条件下，目标3,5,5-三甲基己酸的收率达到88.1%。催化剂循环试验表明，树脂易于分离和回收利用，表明碱性树脂在标题反应中具有良好的应用前景。

更新日期：2022-08-06

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