Organic Chemistry
Organic Chemistry
2nd Edition
ISBN: 9781118452288
Author: David R. Klein
Publisher: WILEY
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Chapter 17, Problem 48PP
Interpretation Introduction

Interpretation:

The trend of reactivity for Cyclopentadiene, 1,3-cyclohexadiene and 1,3-cycloheptadiene are rapidly reactive, mild reactive and unreactive respectively in Diels-Alder reaction should be explained.

Concept introduction:

  • Cycloaddition reaction is a concerted addition reaction of two reactants to form a ring; in which two π-bonds are converted to two σ-bonds.
  • Diels-Alder reaction is a [4+2] cycloaddition reaction, in which a π-system having four atoms (diene) and a π-system having two atoms (dienophile) are undergoing in cycloaddition reaction and producing a substituted cyclohexene.
  • The mechanism of the ring formation in the Diels-Alder reaction is drawn by using three arrows representing the shifting of π-bonds in the two π-systems in a clockwise or counter clockwise fashion, so that the ring formation will take place.
  • The more steric hindrance in the dienes will be less reactive for the Diels-Alder reaction.

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Organic Chemistry

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