Chapter 12 - Structure Determination: Mass Spectrometry And Infrared Spectroscopy Page 33

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Carboxylic Acid Derivatives
Acyl Halides
Acyl Halides (RCOX)
The very reactive acyl halides absorb at frequencies significantly higher than
ketones.
-1;
C=O stretch:
X = F, 1860 ± 20 cm
X = Cl, 1800 ± 15; X = Br,1800 ± 15
33

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