A method should be proposed for the given transformation. 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 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 6- π-electrons Disrotatory Conrotatory To propose: a method for the given transformation. # assumes the electrocyclic reactions are involved in the given transformation.

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Answer 1

Question

Chapter 17, Problem 55PP

Interpretation Introduction

Interpretation:

A method should be proposed for the given transformation.

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 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
6- π-electrons Disrotatory Conrotatory

To propose: a method for the given transformation.

#assumes the electrocyclic reactions are involved in the given transformation.

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Answer 2

Question

Chapter 17, Problem 55PP

Interpretation Introduction

Interpretation:

A method should be proposed for the given transformation.

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 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
6- π-electrons Disrotatory Conrotatory

To propose: a method for the given transformation.

#assumes the electrocyclic reactions are involved in the given transformation.

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Answer 3

Question

Chapter 17, Problem 55PP

Interpretation Introduction

Interpretation:

A method should be proposed for the given transformation.

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 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
6- π-electrons Disrotatory Conrotatory

To propose: a method for the given transformation.

#assumes the electrocyclic reactions are involved in the given transformation.

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Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 17, Problem 55PP

Interpretation Introduction

Interpretation:

A method should be proposed for the given transformation.

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 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
6- π-electrons Disrotatory Conrotatory

To propose: a method for the given transformation.

#assumes the electrocyclic reactions are involved in the given transformation.

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Answer 5

Chapter 17, Problem 55PP

Interpretation Introduction

Interpretation:

A method should be proposed for the given transformation.

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 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
6- π-electrons Disrotatory Conrotatory

To propose: a method for the given transformation.

#assumes the electrocyclic reactions are involved in the given transformation.

Answer 6

Chapter 17, Problem 55PP

Interpretation Introduction

Interpretation:

A method should be proposed for the given transformation.

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 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
6- π-electrons Disrotatory Conrotatory

To propose: a method for the given transformation.

#assumes the electrocyclic reactions are involved in the given transformation.

Answer 7

Chapter 17, Problem 55PP

Interpretation Introduction

Interpretation:

A method should be proposed for the given transformation.

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 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
6- π-electrons Disrotatory Conrotatory

To propose: a method for the given transformation.

#assumes the electrocyclic reactions are involved in the given transformation.

Answer 8

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Answer 9

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Answer 10

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Answer 11

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
6- π-electrons	Disrotatory	Conrotatory

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