The difference in the values of Δ E for the given reactions is to be rationalized. Concept introduction: The bond energy is defined as the amount of energy which is required to break a chemical bond in a molecule or it is the measure of chemical bond strength. It depends on many factors like size of atoms which are involved in a reaction, electron affinities , electronegativity differences and the structure of the molecule. For a shorter bond length the value of bond energy is higher. To determine: The differences in the values of Δ E for the given reactions.

Question

Kumada Coupling: 1. m-Diisobutylbenzene below could hypothetically be synthesized by Friedel-Crafts reaction. Write out the reaction with a mechanism and give two reasons why you would NOT get the desired product. Draw the reaction (NOT a mechanism) for a Kumada coupling to produce the molecule above from m-dichlorobenzene. Calculate the theoretical yield for the reaction in question 2 using 1.5 g of p-dichlorobenzene and 3.0 mL isobutyl bromide. What signals appeared/disappeared/shifted that indicate that you have your intended product and not starting material? What other impurities are present in your product and how do you know?

Answer 1

Question

Chapter 4, Problem 117CP

Interpretation Introduction

Interpretation: The difference in the values of ΔE for the given reactions is to be rationalized.

Concept introduction: The bond energy is defined as the amount of energy which is required to break a chemical bond in a molecule or it is the measure of chemical bond strength. It depends on many factors like size of atoms which are involved in a reaction, electron affinities, electronegativity differences and the structure of the molecule. For a shorter bond length the value of bond energy is higher.

To determine: The differences in the values of ΔE for the given reactions.

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