When 3-methyl-1-butene reacts with HBr, two alkyl halides...

Key Concepts

Carbocation Stability and Rearrangement

Carbocation intermediates are key species in these reactions, and their stability plays a critical role in determining the product distribution. More substituted carbocations are typically more stable. In some cases, a less stable initial carbocation can undergo a rearrangement, such as a hydride or alkyl shift, to form a more stable carbocation before the nucleophilic attack occurs. This rearrangement can lead to the formation of different structural isomers of the final product.

Markovnikov's Rule

Markovnikov's rule predicts that in the electrophilic addition of HX to an unsymmetrical alkene, the hydrogen atom attaches to the carbon with more hydrogen substituents while the halogen attaches to the carbon with fewer hydrogen atoms. This rule guides the regioselectivity of the reaction by favoring the formation of the more stable carbocation intermediate during the protonation step.

Electrophilic Addition Reaction

This is a reaction mechanism where an electrophile, in this case a proton (H+), adds to the double bond of an alkene, forming a carbocation intermediate. The subsequent nucleophilic attack by a halide (Br–) leads to the formation of alkyl halide products. The addition is guided by the nature of the electrophile and the structure of the alkene, which determines the site of initial protonation.

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