Environmentally Friendly and Highly Efficient Co(OAc)<sub>2</sub>-Catalyzed Aerobic Oxidation to Access 2,6-Di-Electron-Donating Group Substituted 4-Hydroxybenzaldehydes
作者:Jian-An Jiang、Jia-Lei Du、Zhong-Nan Zhang、Jiao-Jiao Zhai、Ya-Fei Ji
DOI:10.1080/00397911.2013.813052
日期:2014.5.19
developed for selectively preparing a series of valuable 2,6-dialkyl-, dialkoxyl-, and alkoxylalkyl-substituted 4-hydroxybenzaldehydes from corresponding 4-cresols in good to excellent yields, using a catalytic system of Co(OAc)2 · 4H2O (1.0 mol%)–NaOH (1.0 equiv)–O2 (1.0 atm) in aqueous ethylene glycol (EG/H2O = 20/1, v/v) at 50 °C. Furthermore, a plausible mechanism was proposed for the direct oxyfunctionalization
摘要 开发了一种高效、绿色的好氧氧化,用于从相应的 4-甲酚中选择性地制备一系列有价值的 2,6-二烷基-、二烷氧基-和烷氧基烷基-取代的 4-羟基苯甲醛,使用催化系统。 Co(OAc)2 · 4H2O (1.0 mol%)–NaOH (1.0 equiv)–O2 (1.0 atm) 在乙二醇水溶液 (EG/H2O = 20/1, v/v) 中的浓度为 50 °C。此外,提出了一种将芳香甲基直接氧基官能化为醛基的合理机制。图形概要