(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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For each reaction below, decide if the first stable organic product that forms in solution will create a new CC bond, and check the appropriate box. Next, for each reaction to which you answered "Yes" to in the table, draw this product in the drawing area below. Note for advanced students: for this problem, don't worry if you think this product will continue to react under the current conditions - just focus on the first stable product you expect to form in solution. ? NH2 MgBr Will the first product that forms in this reaction create a new CC bond? ○ Yes ○ No MgBr ? Will the first product that forms in this reaction create a new CC bond? O Yes O No Click and drag to start drawing a structure. :☐ G x c olo Ar HE

Predicting As the lead product manager at OrganometALEKS Industries, you are trying to decide if the following reaction will make a molecule with a new C - C bond as its major product: H₂N O H 1. ? 2. H3O+ If this reaction will work, draw the major organic product or products you would expect in the drawing area below. If there's more than one major product, you can draw them in any arrangement you like. Be sure you use wedge and dash bonds if necessary, for example to distinguish between major products with different stereochemistry. 0 If the major products of this reaction won't have a new CC bond, just check the box under the drawing area and leave it blank. فا Explanation Check Click and drag to start drawing a structure.

Highlight the chirality (or stereogenic) center(s) in the given compound. A compound may have one or more stereogenic centers. OH OH OH OH OH OH

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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Chapter 25 Solutions