EBK ORGANIC CHEMISTRY-STUD.SOLNS.MAN+SG
EBK ORGANIC CHEMISTRY-STUD.SOLNS.MAN+SG
4th Edition
ISBN: 9781119659525
Author: Klein
Publisher: WILEY CONS
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Chapter 18.6, Problem 9CC
Interpretation Introduction

Interpretation:

The inefficacy of the synthesis of the following compound –

                    EBK ORGANIC CHEMISTRY-STUD.SOLNS.MAN+SG, Chapter 18.6, Problem 9CC

  By Friedel Crafts reaction has to be explained.

Concept Introduction:

Friedel Crafts reaction is an electrophilic substitution reaction. This reaction is useful to introduce alkyl, aryl or acyl group onto benzene ring. So this reaction is commonly known as Friedel Crafts acylation if acyl group is imparted on benzene ring or Friedel Crafts alkylation if alkyl group is imparted on benzene ring.

Benzene is highly stable that the sole presence of any alkyl or acyl halide is not enough to initiate the reaction. Lewis acids such as AlCl3,FeCl3,BF3etc is required to initiate the reaction. The Lewis acid catalyst assists in the formation of electrophile. Alkyl halide reacts with Lewis acid to generate alkyl ion as electrophile. The so formed alkyl ion must be highly stable in order to bond with benzene Carbon. Of all the carbocations primary, secondary and tertiary, tertiary carbocation is the most stable.

The type of carbocation initially formed depends upon the alkyl halide. But it rearranges itself to the most stable form. This phenomenon poses some drawbacks to Friedel Crafts reaction that some compounds can’t be prepared by this reaction.

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Chapter 18 Solutions

EBK ORGANIC CHEMISTRY-STUD.SOLNS.MAN+SG

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