Chapter 8, Problem 8.32P

(a)

Interpretation Introduction

Interpretation:

Major product of the given reaction has to be identified.

Concept introduction:

$HBr$ addition to alkene under radical condition:

Non-markonikov addition of $HBr$ to alkenes occur by a radical mechanism in presence of peroxide, in which a $Br·$ reacts with the $\pi$ bond of the alkene to create a radical intermediate that $H·$ from $H-Br$ to continue the chain process. The regioselectivity of the products is the opposite of the ordinary Markonikov addition products that form under polar conditions; hence it is useful alternative to polar addition of $H-Br$ in organic synthesis.

(b)

Interpretation Introduction

Interpretation:

Major product of the given reaction has to be identified.

Concept introduction:

$HBr$ addition to alkene under radical condition:

Non-markonikov addition of $HBr$ to alkenes occur by a radical mechanism in presence of peroxide, in which a $Br·$ reacts with the $\pi$ bond of the alkene to create a radical intermediate that $H·$ from $H-Br$ to continue the chain process. The regioselectivity of the products is the opposite of the odinary Markonikov addition products that form under polar conditions; hence it is useful alternative to polar addition of $H-Br$ in organic synthesis.