An Oxone-mediated oxidative ring-opening reaction of 4,5-disubstituted 9H-fluoren-9-ols by cleavage of a carbon–carbon bond is reported. 2-Hydroxy-2′-aroyl-1,1′-biaryls can be efficiently prepared by simply heating the mixture of fluoren-9-ols, Oxone, and 1,1,1,3,3,3-hexafluoroisopropanol at 60 °C for 4 h. The persulfate-involved ring-expansion processes were proposed and supported by the DFT calculations.

中文翻译：

---

通过 9H-Fluoren-9-ols 的氧化开环合成 2-Hydroxy-2'-aroyl-1,1'-biaryls

4,5-二取代的 9 H -fluoren-9-ols的 Oxone 介导的氧化开环反应通过碳-碳键的断裂进行了报道。2-Hydroxy-2'-aroyl-1,1'-biaryls 可以通过简单地在 60° 下加热 fluoren-9-ols、Oxone 和 1,1,1,3,3,3-hexafluoroisopropanol 的混合物来有效地制备C 4 小时。DFT计算提出并支持过硫酸盐涉及的扩环过程。