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The infrared spectra of thirteen aliphatic aldehydes of varying structure have been recorded and analyzed in the range of 700–400 cm −1 The structural configuration adjacent to the carbonyl group was found to affect the observed spectra in a specific manner It thus appears possible to differentiate α-branched and non-α-branched aliphatic aldehydes from their infrared spectra in this region.
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Pustinger et al. (1964) studied this question.
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