A tandem ring-closing reaction was developed for the synthesis of 9-arylfluorenes and their derivatives. The reaction is metal-free, straightforward and efficient under warm conditions. More than 99% yield is obtained.
Q. Li, W. Xu, J. Hu, X. Chen, F. Zhang and H. Zheng, RSC Adv., 2014, 4, 27722 DOI: 10.1039/C4RA03126A
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