For the given compound under thermal condition, the possible products and the formed product upon the conrotatory ring opening are needed to be determined and the reason for not formed product is to be explained. 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 for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene . The mechanism for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene. 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

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Answer 1

Question

Chapter 16, Problem 55PP

Interpretation Introduction

Interpretation:

For the given compound under thermal condition, the possible products and the formed product upon the conrotatory ring opening are needed to be determined and the reason for not formed product is to be explained.

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 for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

The mechanism for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

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

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Answer 2

Question

Chapter 16, Problem 55PP

Interpretation Introduction

Interpretation:

For the given compound under thermal condition, the possible products and the formed product upon the conrotatory ring opening are needed to be determined and the reason for not formed product is to be explained.

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 for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

The mechanism for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

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

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Answer 3

Question

Chapter 16, Problem 55PP

Interpretation Introduction

Interpretation:

For the given compound under thermal condition, the possible products and the formed product upon the conrotatory ring opening are needed to be determined and the reason for not formed product is to be explained.

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 for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

The mechanism for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

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

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Answer 4

Question

Chapter 16, Problem 55PP

Interpretation Introduction

Interpretation:

For the given compound under thermal condition, the possible products and the formed product upon the conrotatory ring opening are needed to be determined and the reason for not formed product is to be explained.

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 for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

The mechanism for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

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

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Answer 5

Chapter 16, Problem 55PP

Interpretation Introduction

Interpretation:

For the given compound under thermal condition, the possible products and the formed product upon the conrotatory ring opening are needed to be determined and the reason for not formed product is to be explained.

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 for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

The mechanism for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

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

Answer 6

Chapter 16, Problem 55PP

Interpretation Introduction

Interpretation:

For the given compound under thermal condition, the possible products and the formed product upon the conrotatory ring opening are needed to be determined and the reason for not formed product is to be explained.

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 for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

The mechanism for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

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

Answer 7

Chapter 16, Problem 55PP

Interpretation Introduction

Interpretation:

For the given compound under thermal condition, the possible products and the formed product upon the conrotatory ring opening are needed to be determined and the reason for not formed product is to be explained.

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 for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

The mechanism for reverse of Electrocyclic reaction is drawn by using arrows representing the conversion of σ-bond to π-bond and the shifting of π-bonds in the π-system of a cyclic alkene.

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

Answer 8

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Answer 9

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Answer 10

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Answer 11

Ch. 16.1 - Prob. 1CC Ch. 16.2 - Prob. 2CC Ch. 16.2 - Prob. 3CC Ch. 16.2 - Prob. 4CC Ch. 16.3 - Draw an energy diagram showing the relative energy...Ch. 16.4 - Prob. 1LTS Ch. 16.4 - Prob. 6PTS Ch. 16.4 - Prob. 7PTS Ch. 16.5 - Prob. 2LTS Ch. 16.5 - Predict the products for each of the following...

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

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