VIPSolutionsAct like a helpful tutor and exlain me :15.14 Give the diene and dienophile that would react in a Diels-Alder reaction to give each of the following products. Or 12 [ CO,CH,
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Act like a helpful tutor and exlain me :
15.14 Give the diene and dienophile that would react in a Diels-Alder reaction to
give each of the following products.
Or
12 [ CO,CH,
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Asked by: Alok Kumar
Created at: 2026-02-01 06:30:38
Asked by: Alok Kumar
Created at: 2026-02-01 06:30:38
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# Diels-Alder Reaction: Finding the Diene & Dienophile
In a Diels–Alder reaction, a **diene** (a molecule with two conjugated double bonds) reacts with a **dienophile** (an alkene or alkyne, often with electron-withdrawing groups) to form a six-membered ring.
To deduce the diene and dienophile for each product, **work backwards** by breaking the newly formed six-membered ring across the new single bonds (the ones that were originally double bonds).
---
## a.
### Product:
Cyclohexene ring fused to a six-membered ring, with a **–CN** group attached.
**Analysis (Retro Diels–Alder):**
- The cyclohexene ring comes from the diene.
- The –CN group was attached to the dienophile.
- Break the bond between the carbons where the new ring was formed.
### **Diene and Dienophile:**
#### Diene:
1,3-cyclohexadiene (a six-membered ring with two conjugated double bonds).
#### Dienophile:
Ethenenitrile (acrylonitrile):
\[
\ce{CH2=CH-CN}
\]
### **Structures:**
- **Diene:**
- **Dienophile:**
---
## b.
### Product:
A bicyclic (fused) ring with a **–CO₂CH₃** group.
**Analysis:**
- The bicyclic system is characteristic of a Diels–Alder adduct with a diene and a dienophile.
- The ester group (**–CO₂CH₃**) comes from the dienophile.
### **Diene and Dienophile:**
#### Diene:
1,3-cyclopentadiene (a five-membered ring with two conjugated double bonds).
#### Dienophile:
Methyl acrylate:
\[
\ce{CH2=CH-CO2CH3}
\]
### **Structures:**
- **Diene:**
- **Dienophile:**
---
## **Summary Table**
| Product | Diene | Dienophile |
|---------|-------|------------|
| a | 1,3-cyclohexadiene | acrylonitrile (\(\ce{CH2=CH-CN}\)) |
| b | 1,3-cyclopentadiene | methyl acrylate (\(\ce{CH2=CH-CO2CH3}\)) |
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