(a) Interpretation: The products formed when each triene undergoes electrocyclic reaction under [ 1 ] thermal conditions; [ 2 ] photochemical conditions are to be drawn. Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively. Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

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Answer 1

Question

Chapter 25.3, Problem 9P

Interpretation Introduction

(a)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be drawn.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Interpretation Introduction

(b)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be identified.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

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Q1: Predict the major organic product(s) of the following reactions. Include stereochemistry when necessary. Write NR if no reaction, try to explain. 1.) LDA, THF 2.) СОН CI OH H2SO4, heat OH m...... OH 1.) PCC, CH2Cl2 2.) CH3CH2MgBr, THF 3.) H3O+ 4.) TsCl, pyr 5.) tBuOK, tBuOH 1.) SOCI 2, CHCI 3 2.) CH3CH2ONA, DMF OH 1.) HBr 2.) Mg, THF 3.) H₂CO, THE 4.) H3O+ OH NaH, THF

What is the stepwise mechanism for this reaction?

Draw the major product of this reaction

Answer 2

Question

Chapter 25.3, Problem 9P

Interpretation Introduction

(a)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be drawn.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Interpretation Introduction

(b)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be identified.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

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Answer 3

Question

Chapter 25.3, Problem 9P

Interpretation Introduction

(a)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be drawn.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Interpretation Introduction

(b)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be identified.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

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Answer 4

Question

Chapter 25.3, Problem 9P

Interpretation Introduction

(a)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be drawn.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Interpretation Introduction

(b)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be identified.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

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Answer 5

Chapter 25.3, Problem 9P

Interpretation Introduction

(a)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be drawn.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Interpretation Introduction

(b)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be identified.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Answer 6

Chapter 25.3, Problem 9P

Interpretation Introduction

(a)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be drawn.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Answer 7

Chapter 25.3, Problem 9P

Interpretation Introduction

(a)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be drawn.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Answer 8

Interpretation Introduction

(b)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be identified.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Answer 9

Interpretation Introduction

(b)

Interpretation: The products formed when each triene undergoes electrocyclic reaction under [1] thermal conditions; [2] photochemical conditions are to be identified.

Concept introduction: Electrocyclic reactions involve the conversion of σ bonds into π bonds or π bonds into σ bonds. These reactions can take place in photochemical and as well as thermal conditions. The photochemical and thermal reactions take place in the presence of light and heat respectively.

Curved arrows aid in determining the movement and flow of electrons in the reaction. The electrons that take part in the chemical reactions are shown by the curved arrows.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 25.1 - Prob. 1P Ch. 25.2 - Problem 27.2 For each molecular orbital in Figure...Ch. 25.2 - Problem 27.3 (a) Using Figure 27.2 as a guide,...Ch. 25.3 - Prob. 4P Ch. 25.3 - Prob. 5P Ch. 25.3 - Prob. 6P Ch. 25.3 - Prob. 7P Ch. 25.3 - Prob. 8P Ch. 25.3 - Prob. 9P Ch. 25.3 - Problem 27.11 What product would be formed by the...

Solution Summary: The author illustrates the electrocyclic reactions that take place in photochemical and thermal conditions.

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