The 1,2-rearrangement belongs to a broad class of chemical reactions called rearrangement reactions. A rearrangement involving a hydrogen atom is called a 1,2-hydride shift. If the substituent being rearranged is an alkyl group, it is named according to the alkyl group's anion: i.e. 1,2-methanide shift, 1,2-ethanide shift, etc.
A 1,2-hydride shift is a carbocation rearrangement in which a hydrogen atom in a carbocation migrates to the carbon atom bearing the formal charge of +1 (carbon 2) from an adjacent carbon (carbon 1). eg: see also 1,2-alkyl shift, 1,2-aryl shift. Contributors.
A 1,2-hydride shift is a carbocation rearrangement in which a hydrogen atom in a carbocation migrates to the carbon atom bearing the formal charge of +1 (carbon 2) from an adjacent carbon (carbon 1). eg: see also 1,2-alkyl shift, 1,2-aryl shift
A sigmatropic reaction in organic chemistry is a pericyclic reaction wherein the net result is one σ-bond is changed to another σ-bond in an uncatalyzed intramolecular process. The name sigmatropic is the result of a compounding of the long-established sigma designation from single carbon–carbon bonds and the Greek word tropos, meaning turn.
Organic chemistry tutorial video on hydride shift and methyl shift in reaction mechanisms. Learn why carbocation rearrangements occur and recognize patterns to indicate a hydride or methyl shift based on the available groups on your organic compound
Another possibility is 1,2 hydride shift in which you could yield a secondary carbocation intermediate. Then, a further 1,2 hydride shift would give the more stable rearranged tertiary cation. More distant hydride shifts have been observed, such as 1,4 and 1,5 hydride shifts, but these arrangements are too fast to undergo secondary cation ...
Do shifts only occur between adjacent carbons? For example, if a shift between carbons 1 and 3 created a more stable carbocation, but a shift between 1 and 2 created a less stable carbocation, would the shift from 1 to 3 still occur? Or the rearrangement only occurs if a shift to an adjacent carbon produces a more stable carbocation? Thanks
A hydride shift is a rearrangement of atoms in which an unstable carbocation is transformed into a more stable one. Carbocations are ions with positively charged carbon atoms and are often found in organic chemistry.
Hydride and methanide shifts? What are those? Well, I'll tell you. Surely by now you've noticed that's what I'm doing here, no? Carbocation rearrangement is no exception. Learn Organic Chemistry ...
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