What is the major product of the reaction of 2 -methyl- 2...

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Key Concepts

Peroxide Effect

The peroxide effect occurs when peroxides initiate a free radical chain reaction in the addition of hydrogen halides to alkenes. This effect is most notable with HBr, where it overrides the conventional Markovnikov's rule, resulting in the halogen adding to the less substituted carbon.

Free Radical Mechanism

In the presence of peroxides, some addition reactions, particularly with HBr, proceed through a free radical mechanism rather than the typical electrophilic pathway. This mechanism involves radicals rather than carbocations, reversing the expected regiochemistry to yield anti-Markovnikov products.

Electrophilic Addition

This is a reaction mechanism in which an electrophile attacks a carbon-carbon double bond, leading to the formation of a carbocation intermediate that is then attacked by a nucleophile. The outcome of the addition depends largely on the stability of the intermediate formed, influencing the regiochemistry of the final product.

Markovnikov's Rule

Markovnikov's rule predicts that in the addition of a hydrogen halide to an unsymmetrical alkene, the hydrogen atom will attach to the carbon with more hydrogen substituents, and the halide will attach to the more substituted carbon. This rule is based on the relative stability of carbocation intermediates formed during the reaction.

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