Pearson eText Organic Chemistry -- Instant Access (Pearson+)
Pearson eText Organic Chemistry -- Instant Access (Pearson+)
8th Edition
ISBN: 9780135213711
Author: Paula Bruice
Publisher: PEARSON+
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Chapter 28, Problem 35P
Interpretation Introduction

Interpretation:

The two product in the given reaction are formed after [1, 7] sigmatropic rearrangement, one due to hydrogen migration and the other to deuterium migration.  It should be represented the configuration of product by replacing the A and B with appropriate atoms (H or D)

Concept introduction:

In a sigmatropic reaction “ one new sigma-bond is formed as another breaks.”

Pearson eText Organic Chemistry -- Instant Access (Pearson+), Chapter 28, Problem 35P , additional homework tip  1

Sigma tropic rearrangement reactions are designated with digits.  For example a [1, 3] sigma tropic rearrangement describe a reaction in which the residue migrates from position 1 to position 3

Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.

Woodward – Hoffmann rules for sigma tropic rearrangement reactions are listed below

SumofthenumberofbondsinthereactingsytemsofbothreagentsReactionconditionsAllowedmodeofbond formationEvennumberThermalAntarafacialPhotochemicalSuprafacialOddnumberThermalSuprafacialPhotochemicalAntarafacial

Migration of carbon and hydrogen will occur in a sigmatropic rearrangement reaction.  Migration of hydrogen in suprafacial and antarafacial rearrangement can be represented as follows,

Pearson eText Organic Chemistry -- Instant Access (Pearson+), Chapter 28, Problem 35P , additional homework tip  2Pearson eText Organic Chemistry -- Instant Access (Pearson+), Chapter 28, Problem 35P , additional homework tip  3

Carbon migrating with one lobe of its p orbital interacting

Pearson eText Organic Chemistry -- Instant Access (Pearson+), Chapter 28, Problem 35P , additional homework tip  4 Pearson eText Organic Chemistry -- Instant Access (Pearson+), Chapter 28, Problem 35P , additional homework tip  5

Carbon migrating with both lobe of its p orbital interacting

Pearson eText Organic Chemistry -- Instant Access (Pearson+), Chapter 28, Problem 35P , additional homework tip  6Pearson eText Organic Chemistry -- Instant Access (Pearson+), Chapter 28, Problem 35P , additional homework tip  7

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