Predict the major products of the following alkene halogenation reactions. [D is the symbol for deuterium, an isotope of hydrogen.]
(a)

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Identify the type of reaction: The reaction involves an alkene and HBr in the presence of H2O2, which indicates a radical addition reaction.

Understand the mechanism: In the presence of peroxides (H2O2), HBr adds to alkenes via a radical mechanism, leading to anti-Markovnikov addition.

Determine the regioselectivity: In anti-Markovnikov addition, the bromine atom will add to the less substituted carbon of the double bond.

Analyze the structure: The alkene shown is 2-methyl-2-butene. The double bond is between the second and third carbon atoms.

Predict the major product: The bromine will add to the terminal carbon (carbon 3), and the hydrogen will add to the more substituted carbon (carbon 2), resulting in the formation of 2-bromo-2-methylbutane.

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Alkene Reactivity

Alkenes are unsaturated hydrocarbons characterized by at least one carbon-carbon double bond. This double bond is a site of high reactivity, allowing alkenes to undergo various addition reactions, such as halogenation. In these reactions, halogens (like Cl2 or Br2) add across the double bond, resulting in the formation of vicinal dihalides.

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2:09

Alkene Metathesis Concept 1

Markovnikov's Rule

Markovnikov's Rule states that in the addition of HX (where X is a halogen) to an alkene, the hydrogen atom will attach to the carbon with the greater number of hydrogen atoms already attached. This principle helps predict the major product of the reaction, as it favors the formation of the more stable carbocation intermediate during the reaction process.

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The 18 and 16 Electron Rule

Stereochemistry of Halogenation

Halogenation of alkenes can lead to stereochemical outcomes, including the formation of enantiomers or diastereomers. The addition of halogens typically occurs in a trans fashion, resulting in anti-addition products. Understanding the stereochemical implications is crucial for predicting the specific isomers formed in the reaction.

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