Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Question 4

Transcribed Image Text:**Draw the mechanism for the following reaction.**
### Reaction Description
**Substrate:**
- **Structure:** Benzene ring with an isopropyl group attached.
**Reagents:**
- **Isopropyl chloride (Cl–C(CH₃)₂)**
- **AlCl₃ (aluminum chloride)**
**Product:**
- **Structure:** Benzene ring with two isopropyl groups (para-disubstituted benzene).
### Explanation
This reaction is an example of Friedel-Crafts alkylation, a process to attach alkyl groups to an aromatic ring.
1. **Formation of Electrophile:** The aluminum chloride (AlCl₃) reacts with the isopropyl chloride to form an electrophile (a carbocation).
2. **Aromatic Electrophilic Substitution:** The benzene ring attacks the carbocation, resulting in the addition of the isopropyl group to the ring.
3. **Reformation of Aromatic System:** Proton release results in restoration of the aromaticity in the final product.
**Note:** The reaction may yield multiple products due to possible rearrangement of carbocations and other positions of substitution, but the para product is often favored due to steric reasons.
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