(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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Indicate the correct option.a) Graphite conducts electricity, being an isotropic materialb) Graphite is not a conductor of electricityc) Both are false

(f) SO: Best Lewis Structure 3 e group geometry:_ shape/molecular geometry:, (g) CF2CF2 Best Lewis Structure polarity: e group arrangement:_ shape/molecular geometry: (h) (NH4)2SO4 Best Lewis Structure polarity: e group arrangement: shape/molecular geometry: polarity: Sketch (with angles): Sketch (with angles): Sketch (with angles):

1. Problem Set 3b Chem 141 For each of the following compounds draw the BEST Lewis Structure then sketch the molecule (showing bond angles). Identify (i) electron group geometry (ii) shape around EACH central atom (iii) whether the molecule is polar or non-polar (iv) (a) SeF4 Best Lewis Structure e group arrangement:_ shape/molecular geometry: polarity: (b) AsOBr3 Best Lewis Structure e group arrangement:_ shape/molecular geometry: polarity: Sketch (with angles): Sketch (with angles):

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 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