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4-(Di­methyl­amino)­pyridinium 2-butoxy-3-di­cyano­methyl­ene-4-oxo­cyclo­but-1-en-1-olate

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In the crystal structure of the title compound, C7H11N2+·C11H9N2O3, both the cation and the anion lie on a mirror plane. Three C atoms of the butyl group are disordered over two positions related by this plane. The bond-length analysis shows that the surplus negative charge of the anion is delocalized between the cyclo­butene ring and the di­cyano­methyl­ene group. The 4-di­methyl­amino­pyridinium cation has an intermediate aromatic-quinoid structure.
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Document Type: Research Article

Publication date: December 1, 2004

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