Plasmas interacting with organic liquids can lead to novel synthetic processes that are not feasible with conventional vacuum systems due to vapor pressure limitations. Of particular interest are processes that eliminate the generation of waste-streams. Here we show that He+O2 plasma can drive the epoxidation of alkenes in solution, in a process that generates epoxides without oxidant waste-streams, runs at room temperature and atmospheric pressure, and requires no catalyst. The reactions between different reactive oxygen species generated in the plasma and the target alkene, trans-stilbene in this study, have been identified and optimization of the plasma conditions within the constraints of the current experimental set-up have led to yields of ~70%, which are of preparative interest.

中文翻译：

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He+O 2 常压等离子体的反式二苯乙烯环氧化：无氧化剂废物流的环氧化

等离子体与有机液体相互作用可导致新的合成过程，由于蒸气压的限制，传统的真空系统无法实现这些过程。特别令人感兴趣的是消除废物流产生的过程。在这里，我们展示了 He+O2 等离子体可以驱动烯烃在溶液中的环氧化，在这个过程中生成环氧化物没有氧化剂废物流，在室温和大气压下运行，并且不需要催化剂。等离子体中产生的不同活性氧与本研究中的目标烯烃（反式二苯乙烯）之间的反应已被确定，并且在当前实验装置的限制内优化等离子体条件已导致约 70% 的产率，这是准备兴趣。