The structure of the expected product (2) has to be drawn. Concept introduction: PBr 3 is a good brominating agents. In bromination process it is used to convert alcoholic group in to alkyl bromide. S N 2 Reaction: It is a nucleophilic substitution reaction in which the rate determining step depends on both of the molecules involved. The bond making and the bond breaking process happens simultaneously in this reaction. A general S N 2 reaction mechanism is given as, Structure of the substrate plays major role in the reactivity of S N 2 reaction. If the substrate is more substituted then the rate of the reaction will becomes slower. This is due to reason that the mechanism of S N 2 reaction proceeds through backside attack on the substrate, it depends on steric factor that if more groups are attached near the leaving group then reactivity becomes slower. The S N 2 reactivity increases in molecule with better leaving group.

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Chapter 12.9, Problem 18ATS

(a)

Interpretation Introduction

Interpretation:

The structure of the expected product (2) has to be drawn.

Concept introduction:

$PBr3$ is a good brominating agents. In bromination process it is used to convert alcoholic group in to alkyl bromide.

$SN2$ Reaction: It is a nucleophilic substitution reaction in which the rate determining step depends on both of the molecules involved. The bond making and the bond breaking process happens simultaneously in this reaction. A general $SN2$ reaction mechanism is given as,

Structure of the substrate plays major role in the reactivity of $SN2$ reaction. If the substrate is more substituted then the rate of the reaction will becomes slower. This is due to reason that the mechanism of $SN2$ reaction proceeds through backside attack on the substrate, it depends on steric factor that if more groups are attached near the leaving group then reactivity becomes slower. The $SN2$ reactivity increases in molecule with better leaving group.

(b)

Interpretation Introduction

Interpretation:

The possible mechanism for formation of by-product 3 and its stereochemical outcome have to be discussed.

Concept introduction:

$PBr3$ is a good brominating agents. In bromination process it is used to convert alcoholic group in to alkyl bromide.

$SN2$ Reaction: It is a nucleophilic substitution reaction in which the rate determining step depends on both of the molecules involved. The bond making and the bond breaking process happens simultaneously in this reaction. A general $SN2$ reaction mechanism is given as,

Structure of the substrate plays major role in the reactivity of $SN2$ reaction. If the substrate is more substituted then the rate of the reaction will becomes slower. Since the mechanism of $SN2$ reaction proceeds through backside attack on the substrate, it depends on steric factor that if more groups attached near the leaving group the reactivity becomes slower. The $SN2$ reactivity increases in molecule with better leaving group.

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