
Concept explainers
Draw the product of each of the following reactions:
(a)

Interpretation:
The product formed in the given reaction has to be drawn.
Concept introduction:
Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.
There are mainly three types of pericyclic reactions,
- 1) Pericyclic reactions
- 2) Cycloaddition reactions
- 3) Sigmatropic reactions
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for pericyclic reactions are listed below
A photochemical reaction takes place when a reactant absorbs light and a thermal reaction takes place without the absorption of light.
Woodward – Hoffmann rules for the configuration of pericyclic reactions are,
Answer to Problem 23P
Product formed in the given reaction is,
Explanation of Solution
Given reaction is,
Herein, the compound has an even number of
Therefore the structure of the product formed in the reaction is,
(b)

Interpretation:
The product formed in the given reaction has to be drawn.
Concept introduction:
Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.
There are mainly three types of pericyclic reactions,
- 1) Pericyclic reactions
- 2) Cycloaddition reactions
- 3) Sigmatropic reactions
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Pericyclic reactions are listed below
A photochemical reaction takes place when a reactant absorbs light and a thermal reaction takes place without the absorption of light.
Woodward – Hoffmann rules for the configuration of pericyclic reactions are,
Answer to Problem 23P
Product of given reaction is,
Explanation of Solution
Given reaction is,
Herein, the compound has an even number of
Therefore the structure of the product formed in the reaction is,
(c)

Interpretation:
The product formed in the given reaction has to be drawn.
Concept introduction:
Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.
There are mainly three types of pericyclic reactions,
- 1) Pericyclic reactions
- 2) Cycloaddition reactions
- 3) Sigmatropic reactions
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Pericyclic reactions are listed below
A photochemical reaction takes place when a reactant absorbs light and a thermal reaction takes place without the absorption of light.
Woodward – Hoffmann rules for the configuration of pericyclic reactions are,
Answer to Problem 23P
The product of the given reaction is,
Explanation of Solution
Given reaction is,
Here in the compound in which the four methyl substituent point in opposite directions, then according to Woodward-Hoffmann rules, they will be “cis” in the ring-closed product when ring closure is conrotatory and “trans” in the ring-closed product when ring closure is disrotatory.
Therefore the structure of the product formed in the reaction is,
(d)

Interpretation:
The product formed in the given reaction has to be drawn.
Concept introduction:
Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.
There are mainly three types of pericyclic reactions,
- 1) Pericyclic reactions
- 2) Cycloaddition reactions
- 3) Sigmatropic reactions
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Pericyclic reactions are listed below
A photochemical reaction takes place when a reactant absorbs light and a thermal reaction takes place without the absorption of light.
Woodward – Hoffmann rules for the configuration of pericyclic reactions are,
Answer to Problem 23P
Product of the given reaction is,
Explanation of Solution
Given reaction is,
Here in the compound in which the two D and H substituent point in same directions, then according to Woodward-Hoffmann rules, they will be “trans” in the ring-closed product when ring closure is disrotatory and cis in the ring-closed product when ring closure is conrotatory.
Therefore the structure of the product formed in the reaction is,
(e)

Interpretation:
The product formed in the given reaction has to be drawn.
Concept introduction:
Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.
There are mainly three types of pericyclic reactions,
- 1) Pericyclic reactions
- 2) Cycloaddition reactions
- 3) Sigmatropic reactions
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Pericyclic reactions are listed below
A photochemical reaction takes place when a reactant absorbs light and a thermal reaction takes place without the absorption of light.
Woodward – Hoffmann rules for the configuration of pericyclic reactions are,
Answer to Problem 23P
The product of given reaction is,
Explanation of Solution
Given reaction is,
Here in the compound have two
Therefore the structure of the product formed in the reaction is,
(f)

Interpretation:
The product formed in the given reaction has to be drawn.
Concept introduction:
Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.
There are mainly three types of pericyclic reactions,
- 1) Pericyclic reactions
- 2) Cycloaddition reactions
- 3) Sigmatropic reactions
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Pericyclic reactions are listed below
A photochemical reaction takes place when a reactant absorbs light and a thermal reaction takes place without the absorption of light.
Woodward – Hoffmann rules for the configuration of pericyclic reactions are,
Answer to Problem 23P
Product of given reaction is,
Explanation of Solution
Given reaction is,
The reaction carried out under thermal conditions then according with the several Woodward - Hoffmann rules the probable structure formed in the given reaction is,
(g)

Interpretation:
The product formed in the given reaction has to be drawn.
Concept introduction:
Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.
There are mainly three types of pericyclic reactions,
- 1) Pericyclic reactions
- 2) Cycloaddition reactions
- 3) Sigmatropic reactions
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Pericyclic reactions are listed below
A photochemical reaction takes place when a reactant absorbs light and a thermal reaction takes place without the absorption of light.
Woodward – Hoffmann rules for the configuration of pericyclic reactions are,
Answer to Problem 23P
The product of given reaction is,
Explanation of Solution
Given reaction is,
Here in the compound have two
(h)

Interpretation:
The product formed in the given reaction has to be drawn.
Concept introduction:
Pericyclic reactions are “ any concerted reaction in which bonds are formed or brocken in a cyclic transition state”. There is a single transition state from start to finish, in contrast to a stepwise reaction.
There are mainly three types of pericyclic reactions,
- 1) Pericyclic reactions
- 2) Cycloaddition reactions
- 3) Sigmatropic reactions
Woodward –Hoffmann rules are the set of rules used to vindicate or predict certain aspects of the stereo chemical outcome and activation energy of pericyclic reactions.
Woodward – Hoffmann rules for Pericyclic reactions are listed below
A photochemical reaction takes place when a reactant absorbs light and a thermal reaction takes place without the absorption of light.
Woodward – Hoffmann rules for the configuration of pericyclic reactions are,
Answer to Problem 23P
Product of given reaction is,
Explanation of Solution
Given reaction is,
According to the Woodward-Hoffmann rules, the reactant coverts to product under thermal condition and the number of
The structure of the product formed in the reaction is,
Want to see more full solutions like this?
Chapter 28 Solutions
Organic Chemistry (8th Edition)
- For each of the substituted benzene molecules below, determine the inductive and resonance effects the substituent will have on the benzene ring, as well as the overall electron-density of the ring compared to unsubstituted benzene. Molecule Inductive Effects O donating O withdrawing O no inductive effects Resonance Effects Overall Electron-Density ○ donating ○ withdrawing O no resonance effects O electron-rich O electron-deficient O similar to benzene Cl O donating O withdrawing ○ donating ○ withdrawing O no inductive effects O no resonance effects O Explanation Check O electron-rich O electron-deficient similar to benzene X © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessarrow_forwardIdentifying electron-donating and For each of the substituted benzene molecules below, determine the inductive and resonance effects the substituent will have on the benzene ring, as well as the overall electron-density of the ring compared to unsubstituted benzene. Molecule Inductive Effects NH2 ○ donating NO2 Explanation Check withdrawing no inductive effects Resonance Effects Overall Electron-Density ○ donating O withdrawing O no resonance effects O donating O withdrawing O donating withdrawing O no inductive effects Ono resonance effects O electron-rich electron-deficient O similar to benzene O electron-rich O electron-deficient O similar to benzene olo 18 Ar 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Center | Accessibilityarrow_forwardRank each of the following substituted benzene molecules in order of which will react fastest (1) to slowest (4) by electrophilic aromatic substitution. Explanation Check Х (Choose one) OH (Choose one) OCH3 (Choose one) OH (Choose one) © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use | Privacy Centerarrow_forward
- Assign R or S to all the chiral centers in each compound drawn below porat bg 9 Br Brarrow_forwarddescrive the energy levels of an atom and howan electron moces between themarrow_forwardRank each set of substituents using the Cahn-Ingold-Perlog sequence rules (priority) by numbering the highest priority substituent 1.arrow_forward
