VIPSolutionsGive step-by-step solution with explanation and final answer:2. In less than 10 steps, show how epoxide X may be conveniently prepared from methylcyclopentane. more than one step _ = 3 0 using organometallic reagents in some key 0) compound X (ignore stereochemistry)
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Give step-by-step solution with explanation and final answer:
2. In less than 10 steps, show how epoxide X may be conveniently prepared from methylcyclopentane.
more than one step _
= 3 0
using organometallic reagents in some key 0)
compound X (ignore stereochemistry)
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Asked by: Rahul
Created at: 2026-03-01 06:19:21
Asked by: Rahul
Created at: 2026-03-01 06:19:21
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## Step-by-step Solution
We are asked to synthesize the given **epoxide X** from **methylcyclopentane** in less than 10 steps, making use of organometallic reagents in some key steps.
### **Step 1: Bromination of methylcyclopentane**
- **Reagent:** Br₂, light (hv)
- **Product:** 1-bromomethylcyclopentane (benzylic/allylic bromination)
### **Step 2: Conversion to Grignard reagent**
- **Reagent:** Mg, ether
- **Product:** Cyclopentylmethyl magnesium bromide (Grignard reagent)
### **Step 3: Reaction with benzophenone**
- **Reagent:** Benzophenone (Ph₂C=O)
- **Product:** Tertiary alcohol (cyclopentylmethyl attached to a carbon with two phenyls and an OH)
### **Step 4: Dehydration to form an alkene**
- **Reagent:** H₂SO₄ (acid, heat)
- **Product:** Alkene (exocyclic double bond at the tertiary center: cyclopentylidene-diphenylmethane)
### **Step 5: Epoxidation**
- **Reagent:** mCPBA (meta-chloroperoxybenzoic acid)
- **Product:** Epoxide (epoxidation of the exocyclic alkene)
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## **Summary Table**
| Step | Reagent(s) | Transformation |
|------|---------------------------|------------------------------------------------------------|
| 1 | Br₂, hv | Methylcyclopentane → 1-bromomethylcyclopentane |
| 2 | Mg, ether | 1-bromomethylcyclopentane → Grignard reagent |
| 3 | Benzophenone | Grignard + Ph₂C=O → tertiary alcohol |
| 4 | H₂SO₄ (heat) | Tertiary alcohol → alkene |
| 5 | mCPBA | Alkene → epoxide (target structure) |
---
## **Explanation**
1. **Bromination** introduces a good leaving group for further functionalization.
2. **Grignard formation** enables nucleophilic attack on a carbonyl.
3. **Addition to benzophenone** builds the core connectivity, installing two phenyl groups.
4. **Dehydration** forms the necessary alkene for epoxidation.
5. **Epoxidation** gives the desired epoxide X.
---
## **Final Answer**
### **Epoxide X can be prepared from methylcyclopentane in the following steps:**
1. **Brominate methylcyclopentane** with Br₂/hv to get 1-bromomethylcyclopentane.
2. **React with Mg/ether** to form the Grignard reagent.
3. **Add to benzophenone (Ph₂CO)** to obtain the tertiary alcohol.
4. **Dehydrate** the alcohol with acid to generate the alkene.
5. **Epoxidize** with mCPBA to yield the target epoxide X.
**This synthesis uses less than 10 steps and utilizes organometallic chemistry as required.**
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