Abstract
Esters have two characteristic absorptions arising from the C=O and C—O— groups. The carbonyl frequency is notably raised above that of normal ketones by the influence of the adjoining oxygen atom, so that differentiation of the two is usually possible. There is, however, a certain amount of overlap between, for example, unsaturated esters in which the CO frequency is lowered, and ketones such as α-halogen-substituted materials in which the CO frequency is raised. It is therefore necessary to take account of the intensity of the CO band, and also of the single bond C—O band which, in esters, is very strong and which can usually be differentiated from the weaker C—C bands of ketones which appear in the same spectral region. A similar enhancement of the carbonyl intensity under the influence of the adjacent oxygen atom also occurs, of course, in acids; but in practice the existence of these in polymeric form in the state in which they are usually examined results in a compensating shift to a lower frequency. There is still some degree of overlapping between the carbonyl frequency ranges of esters and acids, and the C—O stretching bonds also absorb in similar ranges, but, as has been shown (Chapter 10), the identification of acids from the OH region or by salt formation will usually resolve any difficulties, whilst again there are marked intensity differences in the carbonyl absorptions of the two classes.
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Bellamy, L.J. (1975). Esters and Lactones. In: The Infra-red Spectra of Complex Molecules. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-6017-9_11
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