2016年12月30日 · Resonance is not ‘dancing’. Resonance is often confused by undergraduates (and sometimes even professors) as some kind of oscillation back and forth between multiple structures. That is not the case.

2014年11月3日 · I wish to seek some clarification. My prof taught that cyclopropyl methyl cation is stabilized by "banana bonds" (aka bent bonds) and "dancing resonance". He didn't detail these concepts in as much detail as you did yours, so I don't know their internal details.

2018年6月26日 · A combination of these two resonance hybrids leads to generation of partial positive charge on carbon and partial negative charge on the net resonance hybrid. Next, we have to observe the structure of the 1-methylcycloropyl carbocation. Due to ring strain the bonds are bent and a special kind of resonance involving the σ C-C single bond is ...

2016年8月21日 · The number of significant resonance structures for the tropylium cation is 7, the positive charge can be delocalized to each of the seven carbons as shown below. However 7 resonance structures can also be drawn for the tricyclopropylcarbinyl carbocation. So actually both carbocations have the same number of resonance structures.

2021年9月4日 · In resonance, we have delocalization of electrons and the delocalization can be of several types such as pi-electron delocalization, sigma electron delocalization, dancing resonance, etc (these phenomena are shown in images below) but in mesomeric effect, we can only have pi-electron delocalization. Dancing Resonance. Sigma Bond Resonance

2019年2月11日 · According to me it should be: C>D>B>A..... I came to this conclusion because both C and D have equal number of resonating structures i.e.7.However Bend orbital Bond seems to stabalise more than Resonance so C is assigned higher priority.

2021年9月29日 · $\begingroup$ 'Dancing resonance' is a somewhat distasteful term to describe the case of cyclopropyl methyl cation. It would sound better (to me, atleast) as sigma-resonance. $\endgroup$ – TRC

2019年12月11日 · The An cation is more stable than the Ph cation but that doesn't mean that An can't react. For 2b move the lefthand cyclopropane bond to the right--follow the red arrow-- and now you have a resonance stabilized double bond. 2b either deprotonates to form 3 or, since 2b = 4, undergoes Nazarov cyclization. $\endgroup$ –

2018年4月7日 · In your described case, theoretically, it looks fine, because of more stability due to non-classical resonance (sometimes called dancing resonance). But, if you want to perform that experimentally, the percentage yield may not be guaranteed. It is possible to form the desired carbocation, as it is thermodynamically more stable.

2017年10月31日 · The stability order of the following is: A.III > II > I > IV B.II > III > I > IV C.I > III > IV > II D.I > III > II > IV. Answer: