Acta Cryst. (2001). E57, o819-o821  [ doi:10.1107/S1600536801010856 ]

1-Amino-6-chloro-2-(1H-pyrrol-2-yl)benzimidazole (RS 1350)

A. Pifferi, M. Camalli, R. Silvestri, G. De Martino, S. Massa and M. Artico

Abstract: The title compound (RS 1350), C₁₁H₉ClN₄, was recently synthesized by a Smiles rearrangement of 1-[(5-chloro-2-nitrophenyl)sulfonyl]-1H-pyrrole-2-carbohydrazide or 1-(5-chloro-2-nitrophenyl)-1H-pyrrole-2-carbohydrazide in powdered iron-glacial acetic acid medium. From the crystallographic analysis, it is observed that, in the title compound, the benzimidazole moiety is planar and forms a dihedral angle of 3.8  (2)° with the pyrrole ring. The near planarity of the two rings indicates an extended conjugation.

Online 10 August 2001

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