Abstract
Infrared and Raman spectra (3600–3620cm −1) of methyl propionate CH 3CH 2-COOCH 3, CH 3CH 2COOCD 3 and methyl isobutyrate (CH 3) 2CHCOOCH 3, (CH 3) 2CHCOOCD 3, in liquid and crystalline states, have been recorded. Rotational isomerism, by rotation around the C-C bond α to the carbonyl group, is detected and the energy difference between the conformers is 1.1 ±0.3 kcal mol −1 for methyl propionate and 0.5 ±0.1 kcal mol −1 for methyl isobutyrate. Vibrational assignments in terms of group frequencies are proposed for each conformer, only the more stable being present in the crystal.
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