Improved oxidation methods are provided wherein a reaction mixture comprising a substrate to be oxidized (e.g., phenols, alkenes) and an oxidation catalyst (typically dispersed in an organic solvent system) is supplemented with a compressed gas which expands the reaction mixture, thus accelerating the oxidation reaction. In preferred practice pressurized subcritical or supercritical carbon dioxide is used as the expanding gas, which is introduced into the reaction mixture together with an oxidizing agent. The inventive methods improve the substrate conversion and product selectivity by increasing the solubility of the oxidizing agent in the reaction mixture.
提供了改进的氧化方法,其中包括待氧化基质(如
酚、烯)和氧化催化剂(通常分散在有机溶剂体系中)的反应混合物,辅以压缩气体,使反应混合物膨胀,从而加速氧化反应。首选的做法是使用加压的亚临界或超临界
二氧化碳作为膨胀气体,与氧化剂一起引入反应混合物中。本发明的方法通过增加氧化剂在反应混合物中的溶解度,提高了底物转化率和产品选择性。