The study of the spectra of thirty-six aliphatic ketones in the seven to ten micron region has led to the recognition of bands which permit the facile differentiation of ketones of the three following types. CH<sub>3</sub>COCH<sub>2</sub>R, CH<sub>3</sub>CH<sub>2</sub>COCH<sub>2</sub>R, and RCH<sub>2</sub>CH<sub>2</sub>COCH<sub>2</sub>CH<sub>2</sub>R. The differentiation is based upon the fact that the spectra of methyl ketones show bands at 7.38 and 8 60 microns, while those of ethyl ketones have a characteristic band at 9 03 microns The 9 03 micron band in the spectra of ethyl ketones is in addition to bands at 8.60 and 8 82 microns, which are present also in the spectra of ketones of the type RCH<sub>2</sub>CH<sub>2</sub>COCH<sub>2</sub>CH<sub>2</sub>R (R≠H).
M. A. Gianturco and R. G. Pitcher, "New Spectra-Structure Correlations of Aliphatic Ketones," Appl. Spectrosc. 19, 109-110 (1965)
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