Ethynylene-bridged polymers are currently synthesized by alkyne metathesis polymerization or Pd-catalyzed coupling between diethynylarene and dihaloarene. We report the formation of C≡C linkages in reductive coupling polymerization of bis(benzylic gem-tribromide)s promoted by Cu/polyamine under mild conditions. The polymer backbone was constructed through cascade formation of (Br)C═C(Br) bonds and C≡C bonds. This protocol provides a new method for synthesis of ethynylene-bridged polymers using monomers without alkynyl groups.

中文翻译：

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通过形成碳-碳三键构建的聚合物：双（苄基三溴化物）的还原偶联聚合

目前通过炔烃复分解聚合或二乙炔芳烃和二卤代芳烃之间的钯催化偶联来合成亚乙炔基桥接聚合物。我们报告了在温和条件下由铜/多胺促进的双（苄基宝石-三溴化物）还原偶联聚合中 C≡C 键的形成。通过(Br)C=C(Br)键和C≡C键的级联形成聚合物主链。该协议提供了一种使用不含炔基的单体合成乙炔基桥接聚合物的新方法。