Write a note on peroxide effect
Answers
Answer:
When an unsymmetrical reagent is treated with unsymmetrical alkene in presence of peroxide,then addition takes place against the Markownikoff’s rule i.e. negative part of reagent adds to that carbon ot carbon-carbon double bond which carries more number of hydrogen atoms. This is known as peroxide effect.
For example, when isobutylene is treated with HBr in presence of peroxide,addition takes place to form isobutyl bromide (1-bromo-2-methyl propane).
Mechanism:-
Peroxide effect follows free radical mechanism. Peroxy linkage in peroxides is weaker.Hence they decompose to form free radicals which attack on HBr to form Bromine free radicals.These bromine free radicals attack on alkene to give alkyl free radicals,which attack on next mole of HBr to form alkyl bromide......
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