- An efficient and environmental benign synthesis of 2-benzimidazoles and 2-benzothiazoles using CeCl3-NaI as catalyst
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A one-pot condensation of an aldehyde with 1,2-phenylenediamine or 2-aminothiophenol in dimethyl carbonate at 100°C under O2 in the presence of catalytic amounts of CeCl3-NaI gave an imine intermediate, which cyclised and dehydrogenated to give 2-arylbenzimidazoles or 2-arylbenzothiazoles in good yields.
- Zhu, Xun,Wei, Yunyang
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p. 119 - 121
(2013/04/23)
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- Synthesis and X-Ray Structure of the Tetrameric Molybdenum Complex (2+)2(2-)
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The reactions of MoCl5 with 2-(2'-thienyl)benzimidazole (I) and 2-(2'-thienyl)-1-(2'-thienyl-methyl)benzimidazole (II) have been carried out.From the reaction of (I) a molybdenum complex was obtained, which surprisingly was found to contain (II), by X-ray diffraction analysis.Crystals of the complex are triclinic, space group P1, with unit-cell dimensions, a = 10.524(2), b = 14.352(4), c = 10.213(2) Angstroem, α = 95.49(1), β = 100.68(3), γ = 118.79(1) deg, Z = 1, and R = 0.076 for 2 129 observed reflections.The structure has been solved by direct methods and refined by least squares.It consists of centrosymmetric tetramers, 4>(2-), surrounded by 2-(2'-thienyl)-1-(2'-thienylmethyl)benzimidazolium cations linked to the tetramers through O ...HN(1+) bridges.
- Belicchi, Marisa Ferrari,Fava, Giovanna Gasparri,Pelizzi, Corrado
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