Kalpana Kalpana (Editor)

1,2 rearrangement

Updated on
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Covid-19
1,2-rearrangement

Ie organic lecture 19 3 1 2 rearrangement


A 1,2-rearrangement or 1,2-migration 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 C2 to C3.

Contents

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.

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.

Reaction mechanism

A 1,2-rearrangement is often initialised by the formation of a reactive intermediate such as:

  • a carbocation by heterolysis in a nucleophilic rearrangement or anionotropic rearrangement
  • a carbanion in a electrophilic rearrangement or cationotropic rearrangement
  • a free radical by homolysis
  • a nitrene.
  • 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.

    Radical 1,2-rearrangements

    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.

    1,2 rearrangements

    The following mechanisms involve a 1,2-rearrangement:

  • 1,2-Wittig rearrangement
  • Alpha-ketol rearrangement
  • Beckmann rearrangement
  • Benzilic acid rearrangement
  • Brook rearrangement
  • Criegee rearrangement
  • Curtius rearrangement
  • Dowd–Beckwith ring expansion reaction
  • Favorskii rearrangement
  • Friedel–Crafts reaction
  • Fritsch–Buttenberg–Wiechell rearrangement
  • Halogen dance rearrangement
  • Hofmann rearrangement
  • Lossen rearrangement
  • Pinacol rearrangement
  • Seyferth–Gilbert homologation
  • SN1 reaction (generally)
  • Stevens rearrangement
  • Wagner–Meerwein rearrangement
  • Westphalen–Lettré rearrangement
  • Wolff rearrangement
  • 1,3-Rearrangements

    1,3-rearrangements take place over 3 carbon atoms. Examples:

  • the Fries rearrangement
  • a 1,3-alkyl shift of verbenone to chrysanthenone
  • References

    1,2-rearrangement Wikipedia


    Similar Topics
    Gold (1974 film)
    Alberto Joshimar Acosta
    Paul Gilbert
    Topics
     
    B
    i
    Link
    H2
    L