Acta Cryst. (2006). E62, o1673-o1675  [ doi:10.1107/S1600536806011135 ]

Unexpected formation of a thiazolo[3,2-a]pyridinium methide: a novel subclass of mesoionic compounds

V. B. Rybakov, A. A. Bush, S. I. Troyanov, E. V. Babaev and E. Kemnitz

Abstract: While trying to prepare mesoionic thiazolo[3,2-a]pyridinium-2-thiolate by reaction of 2-bromo-1-(ethoxycarbonylmethyl)pyridinium bromide with CS₂, an unexpected product was formed, namely (ethoxycarbonyl)[3-(ethoxycarbonyl)-1,3-thiazolo[3,2-a]pyridin-4-ium-2-yl](2-thioxo-1,2-dihydropyridin-1-yl)methanide, C₁₉H₁₈N₂O₄S₂. The structure of the product corresponds to a previously unknown subclass of mesoionic thiazolo[3,2-a]pyridinium-2-methylides.

Online 5 April 2006

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