4.) Provide mechanisms for the following reactions: + Br CH3 CH3 CH3 CH3 AlCl3 CH3 CH3 CH3 CH3

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Chapter1: Chemical Foundations
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**Reaction Mechanism Task**

**Objective:** Provide mechanisms for the following reaction:

**Reactants:**

1. Benzene (C₆H₆)
2. 2-bromo-2-methylpropane ((CH₃)₃CBr)

**Reagent:**

- Aluminum chloride (AlCl₃)

**Product:**

- 2-methyl-2-phenylpropane ((CH₃)₃C−C₆H₅)

**Reaction Description:**

This reaction involves the formation of an alkylated benzene ring via the Friedel-Crafts alkylation process.

**Mechanism Overview:**

1. **Formation of Carbocation:**
   - Aluminum chloride (AlCl₃) acts as a Lewis acid and interacts with the bromine atom of the 2-bromo-2-methylpropane, generating a carbocation ((CH₃)₃C⁺).

2. **Electrophilic Attack:**
   - The benzene ring acts as a nucleophile and attacks the carbocation, forming a sigma complex. This step results in the addition of the alkyl group onto the benzene ring.

3. **Deprotonation:**
   - The sigma complex undergoes deprotonation to restore the aromaticity of the benzene ring, leading to the final product.

The reaction showcases a classic example of Friedel-Crafts alkylation, emphasizing electrophilic aromatic substitution.
Transcribed Image Text:**Reaction Mechanism Task** **Objective:** Provide mechanisms for the following reaction: **Reactants:** 1. Benzene (C₆H₆) 2. 2-bromo-2-methylpropane ((CH₃)₃CBr) **Reagent:** - Aluminum chloride (AlCl₃) **Product:** - 2-methyl-2-phenylpropane ((CH₃)₃C−C₆H₅) **Reaction Description:** This reaction involves the formation of an alkylated benzene ring via the Friedel-Crafts alkylation process. **Mechanism Overview:** 1. **Formation of Carbocation:** - Aluminum chloride (AlCl₃) acts as a Lewis acid and interacts with the bromine atom of the 2-bromo-2-methylpropane, generating a carbocation ((CH₃)₃C⁺). 2. **Electrophilic Attack:** - The benzene ring acts as a nucleophile and attacks the carbocation, forming a sigma complex. This step results in the addition of the alkyl group onto the benzene ring. 3. **Deprotonation:** - The sigma complex undergoes deprotonation to restore the aromaticity of the benzene ring, leading to the final product. The reaction showcases a classic example of Friedel-Crafts alkylation, emphasizing electrophilic aromatic substitution.
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