Chapter 12 - Structure Determination: Mass Spectrometry And Infrared Spectroscopy Page 21
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44Carbonyl Compounds
Aldehydes and Ketones
For simple aldehydes and ketones, the stretching vibration
of the carbonyl group gives rise to a strong and distinctive
-1
infrared absorption at 1710 to 1740 cm
.
Since alkyl substituents stabilize the carbocation character of
the ionic contributer, ketone carbonyls have slightly lower
-1
stretching frequencies, 1715 ± 7 cm
, compared with
-1
aldehydes, 1730 ± 7 cm
.
21
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