The Gomberg-type dimerization of bifluorenylidene radicals: an X-ray crystallographic investigation
作者:Laura E. Harrington、James F. Britten、Michael J. McGlinchey
DOI:10.1016/j.tetlet.2003.09.050
日期:2003.10
The reaction of phenylethynyllithium with 9-bromofluorene yields 9,9′-bifluorenylidene, 8, 9,9′-bifluorenyl, 9, and a molecule 10, of formula C52H32, in which coupling has occurred between a 9,9′-bifluorenyl fragment and a 9,9′-bifluorenylidene moiety such that a C(9) position of the former is attached to a C(3) site of the latter. This parallels the unsymmetrical radical coupling of triphenylmethyl
phenylethynyllithium与9-溴芴收率9,9'- bifluorenylidene,反应8,9,9'- bifluorenyl,9,和一个分子10,式C 52 H ^ 32,在其中有一个9,9'之间发生耦合-双芴基片段和9,9'-联芴基亚基部分,使得前者的C(9)位置与后者的C(3)位相连。这与三苯基甲基自由基的不对称自由基偶联作用平行,这导致了Gomberg二聚体,而不是六苯基乙烷。X射线晶体学已阐明了10的结构,并提供了机械原理。