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:

Question

3. Assign absolute configuration (Rors) to each chirality center. a. H Nitz C. он b. 0 H-C. C H 7 C. ་-4 917-417 refs H 1つ ८ ડુ d. Но f. -2- 01 Ho -OH 2HN

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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3. Assign absolute configuration (Rors) to each chirality center. a. H Nitz C. он b. 0 H-C. C H 7 C. ་-4 917-417 refs H 1つ ८ ડુ d. Но f. -2- 01 Ho -OH 2HN

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