# What is “dancing resonance”?

While searching the Internet for information about the tricyclopropylmethyl carbocation, I found a site (askiitians.com) where it said that its stability was due to "dancing (superfast) resonance".

What is "dancing resonance"? How does it take place, and what are the prerequisites for it?

• – DHMO Dec 30 '16 at 14:06
• Are you asking about the homoallyl cation? You might want to look at nonclassical carbocations. – Zhe Dec 30 '16 at 14:35
• – ringo Dec 31 '16 at 2:47
• youtube.com/watch?v=8HGskL5M4cQ – Prakhar Apr 25 '17 at 5:44

Although the above post is right about the misconceptions of resonance, dancing resonance also known as sigma resonance, seems to explain the stability of tricyclopropylmethyl carbocation as the result of increased p orbital character due to the $$\mathrm{sp^3}$$ bond angle in the cyclic compound being lesser than the theoretical 109.5°. This further pushes the pi electron cloud into the $$\mathrm{sp^2}$$ hybrid orbital, stabilizing the structure. Although I am unaware the exact explanation for the increased stability, this seems to be a theoretical explanation.