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This study presents the comparison of conformational behaviour of two similar push–pull ethylenes in which the possibility to form an intramolecular hydrogen bond exists. The IR, Raman and NMR spectroscopic studies as well as ab initio MP2 and DFT B3LYP theoretical calculations using 6-31G** basis set confirmed that the presence of intramolecular hydrogen bond has an important influence on conformational...
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