For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers. Concept introduction: Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes ( π-system ) , in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring. The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene. The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes ( ring closure ) of the HOMO of conjugated (π-system) polyene. According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions , π-systems Thermal Photochemical 4- π-electrons Conrotatory Disrotatory 6- π-electrons Disrotatory Conrotatory Meso-compound is superimposable to its mirror image. Enantiomers are the non-superimposable mirror images of each other. To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

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Answer 1

Question

Chapter 17.9, Problem 24ATS

(a)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(b)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(c)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

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6. Consider the following exothermic reaction below. 2Cu2+(aq) +41 (aq)2Cul(s) + 12(aq) a. If Cul is added, there will be a shift left/shift right/no shift (circle one). b. If Cu2+ is added, there will be a shift left/shift right/no shift (circle one). c. If a solution of AgNO3 is added, there will be a shift left/shift right/no shift (circle one). d. If the solvent hexane (C6H14) is added, there will be a shift left/shift right/no shift (circle one). Hint: one of the reaction species is more soluble in hexane than in water. e. If the reaction is cooled, there will be a shift left/shift right/no shift (circle one). f. Which of the changes above will change the equilibrium constant, K?

Answer 2

Question

Chapter 17.9, Problem 24ATS

(a)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(b)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(c)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

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Answer 3

Question

Chapter 17.9, Problem 24ATS

(a)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(b)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(c)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

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Answer 4

Question

Chapter 17.9, Problem 24ATS

(a)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(b)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(c)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

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Check out a sample textbook solution

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Answer 5

Chapter 17.9, Problem 24ATS

(a)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(b)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

(c)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

Answer 6

Chapter 17.9, Problem 24ATS

(a)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

Answer 7

Chapter 17.9, Problem 24ATS

(a)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

Answer 8

(b)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

Answer 9

(b)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

Answer 10

(c)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

Answer 11

(c)

Interpretation Introduction

Interpretation:

For the given reactions, the product formed should be explained whether it is meso- compound or a pair of enantiomers.

Concept introduction:

Electrocyclic reaction is a concerted cyclization reaction of conjugated polyenes (π-system), in which one π-bond is converted into an σ-bond and remaining π-bonds shift their positions. Thereby the newly formed σ-bond connects the two ends of π-system to form a ring.

The mechanism of the ring formation in the Electrocyclic reaction is drawn by using arrows representing the forming σ-bond and the shifting of π-bonds in the π-system of a polyene.

The reaction conditions (thermal or photochemical) controls the product in such a way that the rotation for end lobes (ring closure) of the HOMO of conjugated (π-system) polyene.

According to Woodward-Hoffmann rule for thermal and photochemical Electrocyclic reactions,

π-systems Thermal Photochemical
4- π-electrons Conrotatory Disrotatory
6- π-electrons Disrotatory Conrotatory

Meso-compound is superimposable to its mirror image.

Enantiomers are the non-superimposable mirror images of each other.

To explain: the product formed is meso compound or a pair of enantiomers for each of the given reactions.

Answer 12

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Answer 13

Expert Solution & Answer

Answer 14

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Answer 15

Ch. 17.1 - Prob. 1CC Ch. 17.2 - Prob. 2CC Ch. 17.2 - Prob. 3CC Ch. 17.2 - Prob. 4CC Ch. 17.2 - Prob. 5CC Ch. 17.3 - Prob. 6CC Ch. 17.4 - Prob. 1LTS Ch. 17.4 - Prob. 7PTS Ch. 17.4 - Prob. 8ATS Ch. 17.4 - Prob. 9ATS

π-systems	Thermal	Photochemical
4- π-electrons	Conrotatory	Disrotatory
6- π-electrons	Disrotatory	Conrotatory

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Chapter 17 Solutions