Preparation and Intramolecular CC Coupling Reaction for Bis‐benzimidazolium Salt |
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| Authors: | Rui Liu Ran Huo Yue Bi Zhixiang Zhao Qingxiang Liu |
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| Affiliation: | Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic‐Organic Hybrid Funtional Material Chemistry, Ministry of Education, College of Chemistry, Tianjin Normal University, Tianjin 300387, China |
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| Abstract: | Bis‐benzimidazolium salt 1 was prepared via a series of reactions using 2,2′‐diphenol as starting material. Compound 2 was afforded through the intramolecular C? C coupling reaction of 1 under the catalysis of Pd(OAc)2. The structure of 2 is characterized through X‐ray diffraction analyses, 1H NMR and 13C NMR. In 2 , two boat‐like seven‐membered rings are contained, where the C? C bond distance newly formed is 1.461(5) Å, and it is between regular C? C single bond (1.54 Å) and C?C double bond (1.34 Å). This shows that new C? C bond has partial double‐bond character. In the crystal packing of 2 , the 2D supramolecular layers are formed via C? H···F hydrogen bond. |
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| Keywords: | bis‐benzimidazolium salt coupling reaction palladium catalysis |
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