Structural
unit
Frequency, cm-1
Frequency, cm-1Stretching vibrations (carbonyl groups)
Aldehydes and ketones1710-1750
1710-1750Carboxylic acids1700-1725
1700-1725Acid anhydrides1800-1850
and 1740-1790
1800-1850
and 1740-1790Esters1730-1750
1730-1750Amides1680-1700
1680-1700Table 13.4 (p 519)
Infrared Absorption Frequencies
Infrared Absorption Frequencies
C
O