作者机构：
[Fu, Wei-Wei; Liang, Yan-Fei; Liu, Yang; Zhu, Xiao-Ming] Key Laboratory of Functional Organometallic Materials of General Colleges and Universities in Hunan Province, Department of Chemistry and Materials Science, Hengyang Normal University, Hengyang 421008, People's Republic of China
通讯机构：
[Fu, W.-W.] D;Department of Chemistry and Materials Science, Key Laboratory of Functional Organometallic Materials of General Colleges, Hengyang Normal University, Hengyang 421008, China
摘要：
The title compound, C20H14N4, is a new polymorph of the previously reported structures, which were orthorhombic, space group Pbca [Bei et al. (2000). Acta Cryst. C56, 718-719] and monoclinic, space group P21/c [Dudd et al. (2003). Green Chem. 5, 187-192]. The asymmetric unit consists of two independent molecules in which the dihedral angels between the central benzene ring and the outer benzimidazole ring systems are 16.81 (10) and 14.23 (10)° in one molecule and 26.09 (10) and 37.29 (10)° in the other. In the crystal, molecules are linked by N-H⋯N and C-H⋯N hydrogen bonds into a tape running along the c-axis direction.
摘要：
An efficient protocol for ligand-free Cu-catalyzed N-arylation of heteroarylamines has been developed. With the use of 1% CuI, a wide range of aryl iodides and bromides coupled with heteroarylamines to afford the corresponding products in high yields. Further, this protocol is particularly suitable for reactions of the most hindered aryl iodides with 2-aminopyridines. (C) 2014 Elsevier Ltd. All rights reserved.
作者机构：
[Huang, Geng; Liu, Yang; Fu, Wei-Wei; Zhu, Xiao-Ming] Key Lab. of Funct. Organometallic Materials of General Colleges and Universities in Hunan Province, Department of Chemistry and Materials Science, Hengyang Normal University, Hengyang 421008, China
通讯机构：
[Fu, W.-W.] K;Key Lab. of Funct. Organometallic Materials of General Colleges and Universities in Hunan Province, Department of Chemistry and Materials Science, Hengyang Normal University, China
摘要：
The asymmetric unit of the title compound, C6H9N3, contains three crystallographically independent molecules of similar geometry. All of the molecules are almost planar, with r.m.s. deviations of 0.003, 0.016 and 0.005 14;Å. In the crystal, the molecules are linked by N - HN hydrogen bonds into zigzag ribbons parallel to the c axis, generating rings of R 2 2(8) graph-set motif.
