Spectres de vibration et conformations du propionate et de l'isobutyrate de méthyle |
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Authors: | Rose Marie Moravie Jacques Corset |
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Institution: | Laboratoire de Chimie Physique et Laboratoire F. N. F. P. V. E.I., 2 rue Henri Dunant, 94, ThiaisFrance |
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Abstract: | Infrared and Raman spectra (3600–3620cm?1) of methyl propionate CH3CH2-COOCH3, CH3CH2COOCD3 and methyl isobutyrate (CH3)2CHCOOCH3, (CH3)2CHCOOCD3, 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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