What is Markovnikov's rule?

Name: Problem 7, Chapter 24: Chemistry
Uploaded: 2020-06-27T15:33:32-08:00
Duration: 1 min 42 s
Channel: Sydney Atkins
Description: What is Markovnikov's rule?

Key Concepts

Markovnikov's Rule

Markovnikov's rule is a principle in organic chemistry that predicts the outcome of the addition of protic acids, like HX, to asymmetrical alkenes. It states that when a hydrogen halide adds to an unsymmetrical alkene, the proton (H+) attaches to the carbon with the greater number of hydrogen atoms, while the halide (X-) attaches to the more substituted carbon. This rule is based on the formation of the more stable carbocation intermediate during the reaction.

Carbocation Stability

Carbocation stability is a crucial concept in understanding many organic reaction mechanisms, including those that follow Markovnikov's rule. More substituted carbocations, which are stabilized by the electron-donating effects of nearby alkyl groups through hyperconjugation and inductive effects, are generally more stable. This stability determines the pathway of the reaction, leading to the major product formation as predicted by Markovnikov's rule.

Electrophilic Addition Reaction

An electrophilic addition reaction is a type of reaction in organic chemistry where an electrophile, such as a proton in HX, reacts with an unsaturated system like an alkene. This reaction typically occurs in two steps: first, the electrophile adds to the double bond to form a carbocation intermediate, and then a nucleophile adds to this intermediate, ultimately leading to the final addition product. The regioselectivity in these reactions is explained by principles like Markovnikov's rule.

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