antimarkovnikov addition
1) B2H6, THF2) H202, OH-adds on OH to double bonded C (C then becomes single bonded)
Antimarkovnikov addition is a type of addition reaction in which the addition of a neutral or electrophilic reagent to an unsaturated compound occurs in a way that the electrophile is added to the less substituted carbon atom. This is in contrast to the traditional Markovnikov addition, where the electrophile adds to the more substituted carbon atom.
The reaction occurs when the unsaturated compound is treated with peroxide (such as H2O2 or di-tert-butyl peroxide) and a suitable electrophile (such as HBr or HCl). The presence of peroxide produces a free radical intermediate, which reacts with the electrophile to form the final product.
For example, consider the addition of HBr to propene using peroxide. In a regular Markovnikov addition, the H+ ion would add to the more substituted carbon atom, resulting in 2-bromopropane. However, in an antimarkovnikov addition, the Br- ion would add to the less substituted carbon atom, resulting in 1-bromopropane.
The antimarkovnikov addition reaction is important in organic chemistry as it allows for the synthesis of compounds that cannot be easily prepared by the Markovnikov addition. It is also a useful tool in designing new reactions and can be applied in the synthesis of complex molecules in pharmaceutical or materials chemistry.
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