Abstract
The shoulders and/or splittings of the carbonyl band of 5-substituted 2-acetyl thiophenes (1–13) are interpreted as a Fermi resonance by means of the solvent variation method. The unperturbed carbonyl frequencies are calculated by the intensity method and checked by correlation analysis of solvent and substituent effects. The acetyl group is more sensitive to substituent effects in acetylthiophenes than in acetylbenzenes, as shown by infrared spectroscopy and by chemical reactivity.
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