Stretching Force Constant of the Carbonyl Bond in Unconjugated Ketones

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Abstract
The secular equation derived for the normal frequencies of a Y‐shaped C2CO model can be used with fair accuracy to obtain the carbonyl bond force constant from the measured carbonyl frequency of any symmetrical ketone if the carbon‐carbon force constant and the bond angles are known or can be reasonably assigned.The narrow spread of carbonyl frequencies observed for unconjugated ketones, with assumed ``normal'' angles and carbon‐carbon force constant, indicates a nearly constant carbonyl stretching force constant in the range 10.2±0.3 (×105 dynes/cm). This value should be equally reliable for unsymmetrical unconjugated ketones.In formaldehyde, the calculated force constant is usually above 12.5 units

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