(a) Interpretation: Without consulting tables or figures, answer the following questions: a thermal disrotatory electrocyclic reaction involving 12 electrons allowed or forbidden-the statement is to be verified. Concept introduction: Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. According to molecular orbital concepts, systems having 4n π electrons undergoes conrotatory ring closure is allowed and this ring closure is forbidden for systems having 4n + 2 π systems. Similarly, disrotatory closing of rings is forbidden for 4n π electrons and allowed for 4n + 2 π electron systems.

Question

Want to see the full answer?

Answer 1

Question

Chapter 28, Problem 28.29AP

Interpretation Introduction

(a)

Interpretation:

Without consulting tables or figures, answer the following questions: a thermal disrotatory electrocyclic reaction involving 12 electrons allowed or forbidden-the statement is to be verified.

Concept introduction:

Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. According to molecular orbital concepts, systems having 4n π electrons undergoes conrotatory ring closure is allowed and this ring closure is forbidden for systems having 4n + 2 π systems. Similarly, disrotatory closing of rings is forbidden for 4n π electrons and allowed for 4n + 2 π electron systems.

Interpretation Introduction

(b)

Interpretation:

a [8s + 4s] photochemical cycloaddition is allowed-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Interpretation Introduction

(c)

Interpretation:

the HOMO of (Z)-3, 4-dimethyl-1, 3, 5-hexatriene symmetric or antisymmetric-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Students have asked these similar questions

3) The following molecule, chloral is a common precursor to chloral hydrate, an acetal type molecule that was a first-generation anesthetic. Draw a mechanism that accounts for tis formation and speculate why it does not require the use of an acid catalyst, like most hemiacetal and acetal reaction: (10 pts) H H₂O

You are a Quality Manager for a very well-known food ingredient company that produces umami powder, and you are responsible for setting specification limits. The net weight (in grams) of bags of unami powder is monitored by taking samples of six bags on an hourly basis during production. The label on every bag reports a contents of 1KG umami powder. The process mean is μ = 1012 g, and when the process is properly adjusted, it varies with σ = 11 g. QUESTION: Your organisation strives to ensure that >99.97% of bags of umami powder produced conforms to specification. What performance process index value is required to achieve this process yield? Calculate PPK using the following formula: Ppk = (USL – mean)/3 σ Ppk = (mean -LSL)/ 3 σ

You are a Quality Manager for a very well-known food ingredient company that produces umami powder, and you are responsible for setting specification limits. The net weight (in grams) of bags of unami powder is monitored by taking samples of six bags on an hourly basis during production. The label on every bag reports a contents of 1KG umami powder. The process mean is μ = 1012 g, and when the process is properly adjusted, it varies with σ = 11 g. QUESTION: Provide a valid and full justification as to whether you would advise your manager that the process is satisfactory when it is properly adjusted, or would you seek their approval to improve the process?

Answer 2

Question

Chapter 28, Problem 28.29AP

Interpretation Introduction

(a)

Interpretation:

Without consulting tables or figures, answer the following questions: a thermal disrotatory electrocyclic reaction involving 12 electrons allowed or forbidden-the statement is to be verified.

Concept introduction:

Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. According to molecular orbital concepts, systems having 4n π electrons undergoes conrotatory ring closure is allowed and this ring closure is forbidden for systems having 4n + 2 π systems. Similarly, disrotatory closing of rings is forbidden for 4n π electrons and allowed for 4n + 2 π electron systems.

Interpretation Introduction

(b)

Interpretation:

a [8s + 4s] photochemical cycloaddition is allowed-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Interpretation Introduction

(c)

Interpretation:

the HOMO of (Z)-3, 4-dimethyl-1, 3, 5-hexatriene symmetric or antisymmetric-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 3

Question

Chapter 28, Problem 28.29AP

Interpretation Introduction

(a)

Interpretation:

Without consulting tables or figures, answer the following questions: a thermal disrotatory electrocyclic reaction involving 12 electrons allowed or forbidden-the statement is to be verified.

Concept introduction:

Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. According to molecular orbital concepts, systems having 4n π electrons undergoes conrotatory ring closure is allowed and this ring closure is forbidden for systems having 4n + 2 π systems. Similarly, disrotatory closing of rings is forbidden for 4n π electrons and allowed for 4n + 2 π electron systems.

Interpretation Introduction

(b)

Interpretation:

a [8s + 4s] photochemical cycloaddition is allowed-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Interpretation Introduction

(c)

Interpretation:

the HOMO of (Z)-3, 4-dimethyl-1, 3, 5-hexatriene symmetric or antisymmetric-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 4

Question

Chapter 28, Problem 28.29AP

Interpretation Introduction

(a)

Interpretation:

Without consulting tables or figures, answer the following questions: a thermal disrotatory electrocyclic reaction involving 12 electrons allowed or forbidden-the statement is to be verified.

Concept introduction:

Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. According to molecular orbital concepts, systems having 4n π electrons undergoes conrotatory ring closure is allowed and this ring closure is forbidden for systems having 4n + 2 π systems. Similarly, disrotatory closing of rings is forbidden for 4n π electrons and allowed for 4n + 2 π electron systems.

Interpretation Introduction

(b)

Interpretation:

a [8s + 4s] photochemical cycloaddition is allowed-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Interpretation Introduction

(c)

Interpretation:

the HOMO of (Z)-3, 4-dimethyl-1, 3, 5-hexatriene symmetric or antisymmetric-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Expert Solution & Answer

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 5

Chapter 28, Problem 28.29AP

Interpretation Introduction

(a)

Interpretation:

Without consulting tables or figures, answer the following questions: a thermal disrotatory electrocyclic reaction involving 12 electrons allowed or forbidden-the statement is to be verified.

Concept introduction:

Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. According to molecular orbital concepts, systems having 4n π electrons undergoes conrotatory ring closure is allowed and this ring closure is forbidden for systems having 4n + 2 π systems. Similarly, disrotatory closing of rings is forbidden for 4n π electrons and allowed for 4n + 2 π electron systems.

Interpretation Introduction

(b)

Interpretation:

a [8s + 4s] photochemical cycloaddition is allowed-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Interpretation Introduction

(c)

Interpretation:

the HOMO of (Z)-3, 4-dimethyl-1, 3, 5-hexatriene symmetric or antisymmetric-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Answer 6

Chapter 28, Problem 28.29AP

Interpretation Introduction

(a)

Interpretation:

Without consulting tables or figures, answer the following questions: a thermal disrotatory electrocyclic reaction involving 12 electrons allowed or forbidden-the statement is to be verified.

Concept introduction:

Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. According to molecular orbital concepts, systems having 4n π electrons undergoes conrotatory ring closure is allowed and this ring closure is forbidden for systems having 4n + 2 π systems. Similarly, disrotatory closing of rings is forbidden for 4n π electrons and allowed for 4n + 2 π electron systems.

Answer 7

Chapter 28, Problem 28.29AP

Interpretation Introduction

(a)

Interpretation:

Without consulting tables or figures, answer the following questions: a thermal disrotatory electrocyclic reaction involving 12 electrons allowed or forbidden-the statement is to be verified.

Concept introduction:

Electrocyclic reactions are a pericyclic reaction which occur intramolecularly. These reactions will result in the formation of ring compounds under the influence of heat or light. Notably, in this process one new sigma bond is formed and one old π-bond is consumed. Intriguingly, the reverse ring opening electrocyclic reaction can also be possible to occur under the same reaction mechanism but in reverse manner. According to molecular orbital concepts, systems having 4n π electrons undergoes conrotatory ring closure is allowed and this ring closure is forbidden for systems having 4n + 2 π systems. Similarly, disrotatory closing of rings is forbidden for 4n π electrons and allowed for 4n + 2 π electron systems.

Answer 8

Interpretation Introduction

(b)

Interpretation:

a [8s + 4s] photochemical cycloaddition is allowed-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Answer 9

Interpretation Introduction

(b)

Interpretation:

a [8s + 4s] photochemical cycloaddition is allowed-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Answer 10

Interpretation Introduction

(c)

Interpretation:

the HOMO of (Z)-3, 4-dimethyl-1, 3, 5-hexatriene symmetric or antisymmetric-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Answer 11

Interpretation Introduction

(c)

Interpretation:

the HOMO of (Z)-3, 4-dimethyl-1, 3, 5-hexatriene symmetric or antisymmetric-the statement is to be verified.

Concept introduction:

The reactions in which the formation of cyclic product observed by combining two or more unsaturated molecules is called cyclo addition reaction. Besides, the net reduction of bond multiplicity is observed. Molecules having 4n π electrons is allowed under photochemical conditions and 4n +2 π electrons is allowed under thermal conditions.

Answer 12

Expert Solution & Answer

Answer 13

Expert Solution & Answer

Answer 14

Want to see the full answer?

Check out a sample textbook solution

See solution

Answer 15

Ch. 28 - Prob. 28.1P Ch. 28 - Prob. 28.2P Ch. 28 - Prob. 28.3P Ch. 28 - Prob. 28.4P Ch. 28 - Prob. 28.5P Ch. 28 - Prob. 28.6P Ch. 28 - Prob. 28.7P Ch. 28 - Prob. 28.8P Ch. 28 - Prob. 28.9P Ch. 28 - Prob. 28.10P

Solution Summary: The author explains that a thermal disrotatory electrocyclic reaction involving 12 electrons is forbidden due to antibonding orbital overlap is not favored.

Concept explainers

Want to see the full answer?

Chapter 28 Solutions