CO₂-catalyzed transition-metal-free oxidation of alcohols has been achieved. Earlier, several methodologies have been explored for alcohol oxidations based on transition-metal catalysts. However, owing to the cheaper price, easy separation and nontoxicity, transition-metal-free systems are in high demand to the pharmaceutical industries. For this reason, various primary and secondary alcohols have been selectively oxidized to the corresponding carbonyl compounds using CO₂ as a catalyst in the presence of different functional groups such as nitrile, nitro, aldehyde, ester, halogen, ether, and so on. At the end, transition-metal-free syntheses of pharmaceuticals have also been achieved. Finally, the role of CO₂ has been investigated in detail, and the mechanism is proposed on the basis of experiments and DFT calculations.

中文翻译：

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DMSO的CO ₂催化氧化苯甲醇和烯丙醇

已经实现了CO ₂催化的无过渡金属醇的氧化。早先，已经探索了几种基于过渡金属催化剂的醇氧化方法。但是，由于价格便宜，易于分离且无毒，因此对制药行业的无过渡金属体系的需求很高。因此，在不同的官能团如腈，硝基，醛，酯，卤素，醚等的存在下，使用CO ₂作为催化剂将各种伯醇和仲醇选择性氧化为相应的羰基化合物。最后，还实现了药物的无过渡金属合成。最后，CO ₂的作用 对此进行了详细的研究，并在实验和DFT计算的基础上提出了该机制。