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The ν CO IR analysis of the 2-fluoro-substituted N,N-dimethylacetamides RC(O)NMe 2 [R FCH 2 (1), F 2 CH (2) and F 3 C (3)] and of the parent N,N-dimethylacetamide [R CH 3 (4)] in solvents of increasing polarity suggests the occurrence of Fermi resonance for 2, 3 and 4 and of cis-gauche rotational isomerism for 1. The 1st overtone analysis along...