Fuchibe K, Akiyama T. Low-Valent Niobium-Mediated Double Activation of C−F/C−H Bonds: Fluorene Synthesis fromo-Arylated α,α,α-Trifluorotoluene Derivatives.
J Am Chem Soc 2006;
128:1434-5. [PMID:
16448098 DOI:
10.1021/ja0565323]
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Abstract
By the treatment of 0.3 molar amount of NbCl5 and LiAlH4, o-arylated alpha,alpha,alpha-trifluorotoluenes afforded fluorene derivatives in good yields. C-F bonds of the CF3 group and the neighboring ortho C-H bond were doubly activated to give the coupling products.
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