Spectroscopy of Aldehydes and Ketones. IR Spectrum of Acetone. C=O. IR Spectrum of Acetophenone. C=O. IR Spectrum of Acetaldehyde. Ald. C-H. C=O. IR Spectrum of p-Tolualdehyde. Ald. C-H. Ald. C-H. C=O. C=O. Summary of Spectral Features.
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IR: 1710-1730 cm-1 (C=O stretching frequency)
(lower by ~ 20 to 30 cm-1 if C=O is conjugated)
aldehydes only: C-H stretch: 2820 & 2720 cm-1
13C-NMR: both aldehydes and ketones have a characteristic C=O peak at 190-215 d.
1H-NMR: aldehydes only: ald. C-H absorbs at 10 d.
both aldehydes and ketones have Hs a to C=O at 2.2-2.5 d.