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This is because ring strain forces more P character into the ring, leaving more S character for the sigma bond, hence a stronger bond and higher frequency.
How ring size affects external (exo) double bonds
Exo double bonds act opposite to endo double bonds, they increase in frequency with decreasing ring size:
This is because ring strain forces more P character into the ring, leaving more S character for the sigma bond, hence a stronger bond and higher frequency.
This is because ring strain forces more P character into the ring, leaving more S character for the sigma bond, hence a stronger bond and higher frequency.
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