ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.)
ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.)
4th Edition
ISBN: 9781119761068
Author: Klein
Publisher: WILEY
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Chapter 5.4, Problem 5.20P

Propose a mechanism for each of the following reactions:

Chapter 5.4, Problem 5.20P, Propose a mechanism for each of the following reactions:

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Interpretation Introduction

Interpretation:

Mechanism for the given transformation has to be proposed.

ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.), Chapter 5.4, Problem 5.20P , additional homework tip  1

Explanation of Solution

Given reaction is,

ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.), Chapter 5.4, Problem 5.20P , additional homework tip  2

Mechanism:

Looking into the reaction it is found that the nucleophile is a strong one namely hydroxide and the reactant has all the three important criteria to undergo SNAr mechanism.  In the reactant, nitro group (electron withdrawing group) and chlorine (leaving group) are present ortho to each other.

First step is the attack of nucleophile on the carbon atom that bears that chlorine atom which is a leaving group resulting in formation of Meisenheimer complex.

ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.), Chapter 5.4, Problem 5.20P , additional homework tip  3

The formed Meisenheimer complex has the following resonance structures.

ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.), Chapter 5.4, Problem 5.20P , additional homework tip  4

Second step is the expelling of the leaving group to give the product.

ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.), Chapter 5.4, Problem 5.20P , additional homework tip  5

As the given condition is basic, deprotonation takes place.

ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.), Chapter 5.4, Problem 5.20P , additional homework tip  6

Under acidic condition the formed ion is protonated to give the product.  This is the reason for using acid in order to complete the reaction.

ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.), Chapter 5.4, Problem 5.20P , additional homework tip  7

Complete mechanism can be given as shown below,

ORGANIC CHEMISTRY-NEXTGEN+BOX (2 SEM.), Chapter 5.4, Problem 5.20P , additional homework tip  8

Mechanism for the given transformation is proposed.

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