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  • 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 (Picture source) 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 - 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
  • 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
  • β-Effect in vinylsilanes - Chemistry Stack Exchange
    However, if the silicon is in the vinylic position, I don't see how it can help in stabilizing the β-carbocation The filled σ-bond cannot interact with the vacant p-orbital
  • 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
  • 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?
  • 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)
  • Chemical Forums: Allylic and Vinylic Reactions Question
    Allylic and Vinylic Reactions Question Vinylic halides: There are instances where nucleophilic substitution will occur for a vinylic halide, though I don't know that you'll cover them in your course One is an Sn2' (Sn2 "prime") reaction Another is addition-elimination reaction of a nucleophile with a vinylogous halide (such as 3-chloro-2-cyclohexen-1-one) Aryl halides: Substitution rxns can
  • organic chemistry - Why do vinylic carbocations have an empty sp2 . . .
    Clarification: If I wasn't completely clear, my main question is why vinylic carbocations have an empty sp2 orbital while tertiary carbocations have an empty p orbital





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