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Improved Synthesis of 2,2‘-Dibromo-9,9‘-spirobifluorene and Its 2,2‘-Bisdonor-7,7‘-bisacceptor-Substituted Fluorescent Derivatives

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posted on 18.08.2005, 00:00 by Chih-Long Chiang, Ching-Fong Shu, Chin-Ti Chen
Pure 2,2‘-Dibromo-9,9‘-spirobifluorene was synthesized by a method that did not involve troublesome dibromination of 9,9‘-spirobifluorene or Sandmeyer reaction of 2,2‘-diamino-9,9‘-spirobifluorene. A series of donor−acceptor orthogonally substituted 9,9‘-spirobifluorene was subsequently prepared showing rich variation of fluorescence in solution and in solid state.

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