(a) Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated. Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

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Answer 1

Question

Chapter 27, Problem 27.31P

Interpretation Introduction

(a)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Interpretation Introduction

(b)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

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Students have asked these similar questions

Draw all of the substitution and elimination products formed from thegiven alkyl halide with each reagent: (a) CH3OH; (b) KOH. Indicate thestereochemistry around the stereogenic centers present in the products,as well as the mechanism by which each product is formed.

Draw the product formed when the following compound undergoes an intramolecular Heck reaction. Indicate the stereochemistry at all double bonds and tetrahedral stereogenic centers.

What product is formed when each compound undergoes thermal electrocyclic ring opening or ring closure? Label each process as conrotatory or disrotatory and clearly indicate the stereochemistry around tetrahedral stereogenic centers and double bonds. CeHs a. b. CeH5

Answer 2

Question

Chapter 27, Problem 27.31P

Interpretation Introduction

(a)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Interpretation Introduction

(b)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

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Answer 3

Question

Chapter 27, Problem 27.31P

Interpretation Introduction

(a)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Interpretation Introduction

(b)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

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Answer 4

Question

Chapter 27, Problem 27.31P

Interpretation Introduction

(a)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Interpretation Introduction

(b)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

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Answer 5

Chapter 27, Problem 27.31P

Interpretation Introduction

(a)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Interpretation Introduction

(b)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Answer 6

Chapter 27, Problem 27.31P

Interpretation Introduction

(a)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Answer 7

Chapter 27, Problem 27.31P

Interpretation Introduction

(a)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Answer 8

Interpretation Introduction

(b)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Answer 9

Interpretation Introduction

(b)

Interpretation: The product formed by the photochemical electrocyclic ring opening or ring closure to the given compound is to be predicted. The process has to be labeled as conrotatory and disrotatory and the stereochemistry around stereogenic center and double bond is to be indicated.

Concept introduction: Electrocyclic reactions involve ring opening or ring closure in a conjugated polyene. According to Woodward-Hoffmann rules, the polyene containing even number of bonds in photochemical conditions undergoes reaction in disrotatory fashion and polyene containing odd number of bonds undergo reaction in conrotatory fashion.

Answer 10

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Answer 12

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Answer 13

Ch. 27 - Prob. 27.1P Ch. 27 - Problem 27.2 For each molecular orbital in Figure...Ch. 27 - Problem 27.3 (a) Using Figure 27.2 as a guide,...Ch. 27 - Problem 27.4 (a) How many molecular orbitals are...Ch. 27 - Prob. 27.5P Ch. 27 - Prob. 27.6P Ch. 27 - Prob. 27.7P Ch. 27 - Prob. 27.8P Ch. 27 - Prob. 27.9P Ch. 27 - Prob. 27.10P

Solution Summary: The author explains the process of photochemical electrocyclic ring opening, which is conrotatory, and the stereochemistry around stereogenic center and double bond.

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Chapter 27 Solutions