Abstract
A series of N,N’-disubstituted 3,4-ethylenedioxythiophene-2,5-dicarboxamides was synthesised by amide bond formation between 3,4-ethylenedioxythiophene-2,5-dicarbonyl chloride and corresponding primary amines, where the size and the nature of the substituent were varied. The crystal structures of prepared compounds were determined by X-ray structure analysis. Mechanism and reaction rates of interconversion between conformational isomers were obtained by DFT calculations. All studied compounds reveal axial chirality with molecular symmetry C 2. Amide bond isomerisation and twisting of the dioxane ring in studied compounds results in the formation of series of conformers of which the s-trans/s-trans conformer is energetically most favourable.
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The financial support from the Croatian Ministry of Science, Education and Sports (Programs 098-1191344-2943 and 053-0982914-2965) is gratefully acknowledged.
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Stolić, I., Molčanov, K., Kovačević, G. et al. Axial chirality of N,N′-disubstituted 3,4-ethylenedioxythiophene-2,5-dicarboxamides. Struct Chem 23, 425–432 (2012). https://doi.org/10.1007/s11224-011-9885-x
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DOI: https://doi.org/10.1007/s11224-011-9885-x