Out of the two indicated brominated system the one molecule that would undergo E2 reaction on treatment with sodium ethoxide in ethanol should be identified and explained. Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4- ( 1,1-dimethylethyl ) cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4- ( 1,1-dimethylethyl ) cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

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Q8: Propose an efficient synthesis of cyclopentene from cyclopentane.

Answer 1

Question

Chapter 7, Problem 64P

(a)

Interpretation Introduction

Interpretation: Out of the two indicated brominated system the one molecule that would undergo E2 reaction on treatment with sodium ethoxide in ethanol should be identified and explained.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

(b)

Interpretation Introduction

Interpretation:Whether anti or syn elimination occurs in the indicated reactions should be written.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

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Q8: Propose an efficient synthesis of cyclopentene from cyclopentane.

Q7: Use compound A-D, design two different ways to synthesize E. Which way is preferred? Please explain. CH3I ONa NaOCH 3 A B C D E OCH3

Predict major product(s) for the following reactions. Note the mechanism(s) of the reactions (SN1, E1, SN2 or E2).

Answer 2

Question

Chapter 7, Problem 64P

(a)

Interpretation Introduction

Interpretation: Out of the two indicated brominated system the one molecule that would undergo E2 reaction on treatment with sodium ethoxide in ethanol should be identified and explained.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

(b)

Interpretation Introduction

Interpretation:Whether anti or syn elimination occurs in the indicated reactions should be written.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

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Answer 3

Question

Chapter 7, Problem 64P

(a)

Interpretation Introduction

Interpretation: Out of the two indicated brominated system the one molecule that would undergo E2 reaction on treatment with sodium ethoxide in ethanol should be identified and explained.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

(b)

Interpretation Introduction

Interpretation:Whether anti or syn elimination occurs in the indicated reactions should be written.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

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Answer 4

Question

Chapter 7, Problem 64P

(a)

Interpretation Introduction

Interpretation: Out of the two indicated brominated system the one molecule that would undergo E2 reaction on treatment with sodium ethoxide in ethanol should be identified and explained.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

(b)

Interpretation Introduction

Interpretation:Whether anti or syn elimination occurs in the indicated reactions should be written.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

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Answer 5

Chapter 7, Problem 64P

(a)

Interpretation Introduction

Interpretation: Out of the two indicated brominated system the one molecule that would undergo E2 reaction on treatment with sodium ethoxide in ethanol should be identified and explained.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

(b)

Interpretation Introduction

Interpretation:Whether anti or syn elimination occurs in the indicated reactions should be written.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

Answer 6

Chapter 7, Problem 64P

(a)

Interpretation Introduction

Interpretation: Out of the two indicated brominated system the one molecule that would undergo E2 reaction on treatment with sodium ethoxide in ethanol should be identified and explained.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

Answer 7

Chapter 7, Problem 64P

(a)

Interpretation Introduction

Interpretation: Out of the two indicated brominated system the one molecule that would undergo E2 reaction on treatment with sodium ethoxide in ethanol should be identified and explained.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

Answer 8

(b)

Interpretation Introduction

Interpretation:Whether anti or syn elimination occurs in the indicated reactions should be written.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

Answer 9

(b)

Interpretation Introduction

Interpretation:Whether anti or syn elimination occurs in the indicated reactions should be written.

Concept introduction: Experimental evidence for E2 mechanism pathway suggests that it readily occurs if the leaving group with respect to the proton is in anti- orientation in stable chair conformation. For instance, when cis-1-bromo-4-(1,1-dimethylethyl)cyclohexane is treated with a strong base it leads to faster bimolecular elimination to afford the corresponding alkene relative to trans-1-bromo-4-(1,1-dimethylethyl)cyclohexane . This is because in the transition state for E2 elimination as illustrated below:

Answer 10

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Ch. 7.1 - Prob. 7.1E Ch. 7.2 - Prob. 7.2E Ch. 7.3 - Prob. 7.3E Ch. 7.3 - Prob. 7.5TIY Ch. 7.4 - Prob. 7.7TIY Ch. 7.5 - Prob. 7.9TIY Ch. 7.6 - Prob. 7.10E Ch. 7.7 - Prob. 7.11E Ch. 7.7 - Prob. 7.12E Ch. 7.7 - Prob. 7.13E

Solution Summary: The author explains the mechanism of E2 reaction on treatment with sodium ethoxide in ethanol.

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