Why are vinylic and allylic carbons named so? So, the carbons in vinyl group is "vinylic" carbon and the carbon in the extra methylene bridge is the "allylic" carbon () Regarding the origin of the word, the respective Wikipedia page has a good information In short: allyl comes from the scientific name for garlic, Allium sativum
organic chemistry - Why do vinylic carbocations generally not undergo . . . Why do vinylic carbocations generally not undergo hydride rearrangement from neighbouring sp 3 carbon to get more stability? According to me, a rearrangement would lead to an allylic carbocation, which is more stable than vinylic, hence the rearrangement should be favorable
organic chemistry - GOC allylic,vinylic, benzylic positions . . . allylic position explanation benzylic position explanation vinylic position explanation For carbocation stability, think about which case has opportunity for electron resonance, i e , which case (s) allows the positive charge to be delocalized to adjacent pi bonds This resource might help
Why are vinylic and arylic carbocations highly unstable? I have checked the internet and read quite a few books, but I still am not able to understand why vinylic and arylic carbocations are highly unstable What I found while surfing the internet is: For arylic carbocation, the carbon bearing postive charge cannot participate in resonance with adjacent carbons because it's p orbital is perpendicular
What is the difference between an Aryl Halide and a Vinyl Halide? Are aryl halides a type of vinyl halide? From my knowledge, when a Halogen atom is directly bonded to a doubly bonded carbon atom it is a Vinyl halide When we look at halogen atom directly bonded
Which is more stable? A phenyl carbanion or a disubstituted vinylic . . . 12 I came across a question which asks to work out the stability order for the following species- b c $\ce {R2C=CH-}$ Can the lone pair on phenyl carbanion participate in resonance? If yes, then how? Also, how is that more stable than the vinylic carbanion?
Which proton in cyclohexene is the most acidic? Therefore the compound would prefer losing H b Hence H b is the most acidic When comparing between Ha and Hc, Ha would be the more acidic as when we remove Hc there is a vinylic carbanion that is being formed And Vinylic Carbanions are very unstable Thus extricating Hb is more feasible thus making it more acidic
H-NMR conjugated pi system - Chemistry Stack Exchange I want to predict the relative chemical shift (H-NMR) of the aromatic hydrogens A, B, C, and the relative chemical shift of the vinylic hydrogens D, E, F, G For this, I have included the structures of the resonance contributors of the conjugated molecule (see image)
β-Effect in vinylsilanes - Chemistry Stack Exchange $\ce {C-Si}$ bond is too long and thus weak There is $\sigma$-donation effect in which the electrons of the C-Si bond get donated to the vinylic postion The reason why it is vinylic is because the orbitals are effectively parallel (the empty pure p-orbital and the $\ce {C-Si}$ (as you posted in your picture))<br> You might feel this effect is similar to hyperconjugation in carbocation
organic chemistry - Stability of vinylic carbocation in . . . According to MOC — Hydrohalogenation of Alkynes, during the addition of hydrogen halide HX to alkyne the mechanism proceeds through a carbocation pathway with the formation of vinylic cation: A vin