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A 1,2-rearrangement or 1,2-shift or Whitmore 1,2-shift  is an organic reaction where a substituent moves from one atom to another atom in a chemical compound. In a 1,2 shift the movement involves two adjacent atoms but moves over larger distances are possible. In the example below the substituent R moves from carbon atom C1 to C2.
The rearrangement is intramolecular and the starting compound and reaction product are structural isomers. The 1,2-rearrangement belongs to a broad class of chemical reactions called rearrangement reactions.
Additional recommended knowledge
A 1,2-rearrangement is often initialised by the formation of a reactive intermediate such as:
The driving force for the actual migration of a substituent in step two of the rearrangement is the formation of a more stable intermediate. For instance a tertiary carbocation is more stable than a secondary carbocation and therefore the SN1 reaction of neopentyl bromide with ethanol yields tert-pentyl ethyl ether.
Carbocation rearrangements are more common than the carbanion or radical counterparts. This observation can be explained on the basis of Hückel's rule. A cyclic carbocationic transition state is aromatic and stabilized because it holds 2 electrons. In an anionic transition state on the other hand 4 electrons are present thus antiaromatic and destabilized. A radical transition state is neither stabilized or destabilized.
The most important carbocation 1,2-shift is the Wagner-Meerwein rearrangement. A carbanionic 1,2-shift is involved in the benzilic acid rearrangement.
The first radical 1,2-rearrangement reported by Heinrich Otto Wieland in 1911  was the conversion of bis(triphenylmethyl)peroxide 1 to the tetraphenylethane 2.
The reaction proceeds through the triphenylmethoxyl radical A, a rearrangement to diphenylphenoxymethyl C and its dimerization. It is unclear to this day whether in this rearrangement the cyclohexadienyl radical intermediate B is a transition state or a reactive intermediate as it (or any other such species) has thus far eluded detection by ESR spectroscopy .
An example of a less common radical 1,2-shift can be found in the gas phase pyrolysis of certain polycyclic aromatic compounds . The energy required in an aryl radical for the 1,2-shift can be high (up to 60 kcal/mol or 250 kJ/mol) but much less than that required for a proton abstraction to an aryne (82 kcal/mol or 340 kJ/mol). In alkene radicals proton abstraction to an alkyne is preferred.
The following mechanisms involve a 1,2-rearrangement:
1,3-rearrangements take place over 3 carbon atoms. Examples:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "1,2-rearrangement". A list of authors is available in Wikipedia.|