Chapter 14.SE, Problem 19VC

Interpretation Introduction

Interpretation:

The structure of the conjugated diene that reacts with HBr to give the carbocation intermediate shown and that of the final products obtained during the reaction are to be given.

Concept introduction:

Conjugated dienes undergo electrophilic addition reactions through the formation of an allyl carbocation. The allyl cation is resonance stabilized and the attack of bromide ion on each of these forms leads to the formation of a mixture of 1, 2- and 1, 4-addition products.

To give:

The structure of the conjugated diene that reacts with HBr to give the carbocation intermediate shown and that of the final product obtained during the reaction.