Chapter 12 - Structure Determination: Mass Spectrometry And Infrared Spectroscopy Page 36
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44Carboxylic Acid Derivatives
Amides & Lactams
Amides & Lactams (RCONR
): The relatively unreactive amides absorb at lower
2
-1
frequencies. C=O bands : 1° & 2°-amides, 1510 to 1700 cm
(2 bands)
3°-amides, 1650± 15 (one band); 6-membered lactams, 1670 ± 10 (one band)
5-membered lactams, 1700 ± 15 ; 4-membered lactams, 1745 ± 15.
36
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