Conformations of some saturated carbonyl compounds. Part I. Infrared spectra of methyl formate, acetate, propionate, and n-butyrate; [2H3]methyl propionate and [2H3]methyl n-butyrate
- 1 January 1972
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 8,p. 1029-1032
- https://doi.org/10.1039/p29720001029
Abstract
I.r. spectra of methyl formate, acetate, propionate, n-butyrate; and [2H3]methyl propionate and n-butyrate are reported. The effects of cooling solutions in carbon disulphide from 35 to –110°, and of solidification, on these spectra are interpreted in terms of conformational equilibria. One pair of conformers is suggested for methyl propionate for which the additional enthalpy (ΔH°) for the high energy form is 87 ± 19 cal mol–1. Two pairs of conformers are suggested for methyl n-butyrate for which the additional enthalpies of the high-energy forms are 92 ± 27 and 440 ± 20 cal mol–1. It was not possible to determine ΔS° from the data.Keywords
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