Infrared spectra of Acid Anhydride, (RCO)2O
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11-11-2019
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Infrared spectra of Acid Anhydride, (RCO)2O
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Acid Anhydride, (RCO)2O
acyclic
6-membered ring
5-membered ring
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C=O stretch (2 bands)
1750 & 1820 cm-1
1750 &1820
1785 & 1865
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Conjugation lowers the C=O frequencies reported here, as with aldehydes & ketones. The two stretching bands are separated by 60 ± 30 cm-1, and for acyclic anhydrides the higher frequency (asymmetric stretching) band is stronger than the lower frequency (symmetric) absorption. Cyclic anhydrides also display two carbonyl stretching absorptions, but the lower frequency band is the strongest.
One or two -CO-O-CO- stretching bands are observed in the 1000 to 1300 cm-1 region.
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