A visible light-mediated (blue LED: λ= 455±10 nm), rose bengal-catalyzed intramolecular cycloaromatization reaction of alkyl 1, 1’-biaryl-2-ones for the synthesis of 10-alkylphenanthren-9-ols in water under open air atmosphere at ambient conditions has been developed. Experimental studies demonstrate that the reaction proceeded via a radical pathway. This protocol is applicable to a wide variety of substrates giving expected 10-alkylphenanthren-9-ols in good yields, appropriate for the gram-scale synthesis, atom economy, and eco-friendly as compared to literature reported methodology for the preparation of phenanthrol derivatives. Moreover, to the best of our knowledge, no instance has hitherto been accounted on the visible light-induced transformation of readily available alkyl 1,1’-biaryl-2-ones to 10-alkylphenanthren-9-ols.

可见光介导的（蓝色LED：λ= 455±10 nm），玫瑰孟加拉催化的烷基1，1'-联芳基-2-酮的玫瑰孟加拉催化的分子内芳环化反应，用于在水中在10-A的条件下合成10-烷基菲蒽9-醇。已经开发出在环境条件下的露天气氛。实验研究表明，该反应通过自由基途径进行。与文献报道的制备菲咯啉衍生物的方法相比，该方案适用于各种底物，可提供预期的10-烷基菲咯啉9-醇，收率良好，适用于克级合成，原子经济和生态友好。而且，据我们所知，迄今为止，尚无关于可见光诱导的容易获得的烷基1，1'-联芳基-2-酮向10-烷基菲蒽-9-醇的转化的实例。