The mode of ring closure for each of the given electro cyclic reactions has to be identified. Concept introduction: In an electrocyclic reaction “one new sigma- bond is formed or brocken.” 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 Electrocyclic reactions are listed below Number of conjugated Π bonds Reaction conditions Allowed mode of rong closure Even number Thermal Conrotatory Photochemical Disrotatory Odd number Thermal Disrotatory Photochemical Conrotatory Woodward – Hoffmann rules for the configuration of electrocyclic reactions are, Substituents in the reactant Mode of ring closure Configuration of the product Point in opposite directions Disrotatory cis Conrotatory trans Point in the same directions Disrotatory trans Conrotatory cis In conrotatory mode both the atomic orbitals of the end groups turn in the same direction. But in the disrotatory the turning direction is different.

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Answer 1

Question

Chapter 28.3, Problem 8P

(a)

Interpretation Introduction

Interpretation: The mode of ring closure for each of the given electro cyclic reactions has to be identified.

Concept introduction:

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

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 Electrocyclic reactions are listed below

Number of conjugated Π bondsReaction conditionsAllowed mode of rong closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

In conrotatory mode both the atomic orbitals of the end groups turn in the same direction.

But in the disrotatory the turning direction is different.

(b)

Interpretation Introduction

Interpretation: The configuration of the indicated hydrogens in the reactions has to be predicted.

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Instructions: Complete the questions in the space provided. Show all your work 1. You are trying to determine the rate law expression for a reaction that you are completing at 25°C. You measure the initial reaction rate and the starting concentrations of the reactions for 4 trials. BrO³¯ (aq) + 5Br¯ (aq) + 6H* (aq) → 3Br₂ (l) + 3H2O (l) Initial rate Trial [BrO3] [H*] [Br] (mol/L) (mol/L) | (mol/L) (mol/L.s) 1 0.10 0.10 0.10 8.0 2 0.20 0.10 0.10 16 3 0.10 0.20 0.10 16 4 0.10 0.10 0.20 32 a. Based on the above data what is the rate law expression? b. Solve for the value of k (make sure to include proper units) 2. The proposed reaction mechanism is as follows: i. ii. BrО¸¯ (aq) + H+ (aq) → HBrO3 (aq) HBrO³ (aq) + H* (aq) → H₂BrO3* (aq) iii. H₂BrO³* (aq) + Br¯ (aq) → Br₂O₂ (aq) + H2O (l) [Fast] [Medium] [Slow] iv. Br₂O₂ (aq) + 4H*(aq) + 4Br‍(aq) → 3Br₂ (l) + H2O (l) [Fast] Evaluate the validity of this proposed reaction. Justify your answer.

е. Д CH3 D*, D20

C. NaOMe, Br Br

Answer 2

Question

Chapter 28.3, Problem 8P

(a)

Interpretation Introduction

Interpretation: The mode of ring closure for each of the given electro cyclic reactions has to be identified.

Concept introduction:

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

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 Electrocyclic reactions are listed below

Number of conjugated Π bondsReaction conditionsAllowed mode of rong closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

In conrotatory mode both the atomic orbitals of the end groups turn in the same direction.

But in the disrotatory the turning direction is different.

(b)

Interpretation Introduction

Interpretation: The configuration of the indicated hydrogens in the reactions has to be predicted.

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Answer 3

Question

Chapter 28.3, Problem 8P

(a)

Interpretation Introduction

Interpretation: The mode of ring closure for each of the given electro cyclic reactions has to be identified.

Concept introduction:

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

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 Electrocyclic reactions are listed below

Number of conjugated Π bondsReaction conditionsAllowed mode of rong closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

In conrotatory mode both the atomic orbitals of the end groups turn in the same direction.

But in the disrotatory the turning direction is different.

(b)

Interpretation Introduction

Interpretation: The configuration of the indicated hydrogens in the reactions has to be predicted.

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Answer 4

Question

Chapter 28.3, Problem 8P

(a)

Interpretation Introduction

Interpretation: The mode of ring closure for each of the given electro cyclic reactions has to be identified.

Concept introduction:

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

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 Electrocyclic reactions are listed below

Number of conjugated Π bondsReaction conditionsAllowed mode of rong closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

In conrotatory mode both the atomic orbitals of the end groups turn in the same direction.

But in the disrotatory the turning direction is different.

(b)

Interpretation Introduction

Interpretation: The configuration of the indicated hydrogens in the reactions has to be predicted.

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Answer 5

Chapter 28.3, Problem 8P

(a)

Interpretation Introduction

Interpretation: The mode of ring closure for each of the given electro cyclic reactions has to be identified.

Concept introduction:

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

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 Electrocyclic reactions are listed below

Number of conjugated Π bondsReaction conditionsAllowed mode of rong closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

In conrotatory mode both the atomic orbitals of the end groups turn in the same direction.

But in the disrotatory the turning direction is different.

(b)

Interpretation Introduction

Interpretation: The configuration of the indicated hydrogens in the reactions has to be predicted.

Answer 6

Chapter 28.3, Problem 8P

(a)

Interpretation Introduction

Interpretation: The mode of ring closure for each of the given electro cyclic reactions has to be identified.

Concept introduction:

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

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 Electrocyclic reactions are listed below

Number of conjugated Π bondsReaction conditionsAllowed mode of rong closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

In conrotatory mode both the atomic orbitals of the end groups turn in the same direction.

But in the disrotatory the turning direction is different.

Answer 7

Chapter 28.3, Problem 8P

(a)

Interpretation Introduction

Interpretation: The mode of ring closure for each of the given electro cyclic reactions has to be identified.

Concept introduction:

In an electrocyclic reaction “one new sigma- bond is formed or brocken.”

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 Electrocyclic reactions are listed below

Number of conjugated Π bondsReaction conditionsAllowed mode of rong closureEven numberThermalConrotatoryPhotochemicalDisrotatoryOdd numberThermalDisrotatoryPhotochemicalConrotatory

Woodward – Hoffmann rules for the configuration of electrocyclic reactions are,

Substituents in the reactantMode of ring closure Configuration of the productPoint in opposite directionsDisrotatorycisConrotatorytransPoint in the same directionsDisrotatorytransConrotatorycis

In conrotatory mode both the atomic orbitals of the end groups turn in the same direction.

But in the disrotatory the turning direction is different.

Answer 8

(b)

Interpretation Introduction

Interpretation: The configuration of the indicated hydrogens in the reactions has to be predicted.

Answer 9

(b)

Interpretation Introduction

Interpretation: The configuration of the indicated hydrogens in the reactions has to be predicted.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 28.1 - Prob. 1P Ch. 28.2 - Prob. 2P Ch. 28.2 - Prob. 3P Ch. 28.2 - Give a molecular orbital description for each of...Ch. 28.3 - Prob. 5P Ch. 28.3 - Prob. 6P Ch. 28.3 - Prob. 7P Ch. 28.3 - Prob. 8P Ch. 28.4 - Prob. 10P Ch. 28.4 - Prob. 11P

Interpretation: The configuration of the indicated hydrogens in the reactions has to be predicted.

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Chapter 28 Solutions