please explain the cause of anti-markovnikov's rule? is it related with steric hinderance? why does it happen in presonce of peroxide

Asked by PRATIK SETHI | 30th Nov, 2010, 12:00: AM

Expert Answer:

Dear Student
If organic peroxides are present it is a free radical chain reaction rather than electrophillic addition reaction.

Step 1 : Chain initiation

The chain is initiated by free radicals produced by an oxygen-oxygen bond in the organic peroxide breaking.

These free radicals extract a hydrogen atom from a hydrogen bromide molecule to produce bromine radicals.

Step 2 : Chain propagation

A bromine radical joins to the ethene using one of the electrons in the pi bond. That creates a new radical with the single electron on the other carbon atom.

That radical reacts with another HBr molecule to produce bromoethane and another bromine radical to continue the process.


Step 3: Chain termination

Eventually two free radicals hit each other and produce a molecule of some sort. The process stops here because no new free radicals are formed
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Answered by  | 1st Dec, 2010, 04:28: PM

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