NN-linked biazoles. Part 2. Attempted routes to the benzimidazol-1-yl radical. Synthesis of 2,2′-dimethyl-1,1′-bibenzimidazole
作者:Javier de Mendoza、Carles Millan、Pedro Rull
DOI:10.1039/p19810000403
日期:——
A synthesis of a 1,1′-bibenzimidazole (2; R = Me), through two successive heterocyclizations on 2,2′-azoaniline, is reported. Alternative routes to (2) by direct formation of the N–N bond from the appropriate N-substituted-benzimidazoles were unsuccessful. The dimer (2) shows great thermal and photochemical stability towards hydrogen abstraction and addition to olefins. Although the N–N bond can be
据报道,通过在2,2'-偶氮苯胺上连续两次杂环化,合成了1,1'-联苯并咪唑(2; R = Me)。通过适当的N-取代的苯并咪唑类化合物直接形成N-N键而形成(2)的替代方法是不成功的。二聚体(2)表现出极强的热和光化学稳定性,对氢的提取和向烯烃的添加均具有稳定性。尽管N–N键很容易在乙醇中被辐射裂解,但从(2)中检测中性自由基苯并咪唑-1-基(1; R = Me)的所有尝试均未成功。但是,以1-碘代苯并咪唑为前体观察到了由(1)提取的氢。