The effect of near-UV irradiation on the oxygenation of toluene dissolved in MeCN was studied in a stainless-steel reactor upon O₂ bubbling at 80°C and 100°C and 10 atm using Co (acac)₂ and 9-mesityl-2,7,10-trimethylacridinium perchlorate (Me₂Acr⁺–Mes ClO₄⁻) as the catalyst and photocatalyst, respectively. In the absence of the process mediator N-hydroxyphthalimide (NHPI), the rate of PhCH₃ oxidation was extremely low, leading to trace amounts of the products formed. The presence of NHPI and the irradiation with UV light enhanced the substrate oxygenation and benzyl alcohol, benzaldehyde, and benzoic acid yield substantially by three to four times. The relative content of the last product was lowest at the beginning of the process as well as in light-excited oxygenation. In this report, we highlight the mechanism of catalyst, photocatalyst, and mediator combined effect on product yield and composition.

中文翻译：

---

Co (acac)2/9-mesityl-10-methylacridinium 离子/N-羟基邻苯二甲酰亚胺串联增强甲苯的紫外线诱导氧化

近UV照射对甲苯溶于MeCN的氧合作用是在一个不锈钢反应器后ö研究₂鼓泡于80℃和100℃，10个大气压使用的Co（ACAC）₂和9均三甲苯基-2- , 7,10-三甲基吖啶鎓高氯酸盐（Me ₂ Acr ⁺ –Mes ClO ₄ ^-）分别作为催化剂和光催化剂。在不存在过程介体N-羟基邻苯二甲酰亚胺(NHPI) 的情况下，PhCH ₃的速率氧化极低，导致形成痕量产物。NHPI 的存在和紫外线照射增强了底物氧化作用，苯甲醇、苯甲醛和苯甲酸的产率显着提高了三到四倍。最后一个产品的相对含量在过程开始时以及光激发氧化时最低。在本报告中，我们重点介绍了催化剂、光催化剂和介体对产品收率和组成的综合影响的机制。