a. b. с. ОН OH ОН

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Chapter1: Chemical Foundations
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**Problem 2: Synthesizing Alcohols Using Grignard Reagents**

**Task**: Propose two different methods to synthesize each of the following alcohols using a Grignard reagent.

**Model Example**:
- Target Alcohol: Butan-2-ol (CH₃CH₂CHOHCH₃)

**Method 1**:
1. React propanal (CH₃CH₂CHO) with methylmagnesium bromide (CH₃MgBr).
2. Perform acidic work-up using hydronium ion (H₃O⁺).

**Method 2**:
1. React acetaldehyde (CH₃CHO) with butylmagnesium bromide (CH₃CH₂CH₂CH₂MgBr).
2. Perform acidic work-up using hydronium ion (H₃O⁺).

**Target Alcohols**:

a. **Alcohol Structure**:
   \[
   \text{OH positioned on a cyclopentane with two ethyl groups.}
   \]

b. **Alcohol Structure**:
   \[
   \text{OH on a hexane chain with methyl branching at the third carbon.}
   \]

c. **Alcohol Structure**:
   \[
   \text{OH positioned on a cyclohexane with a methyl group.}
   \]

**Instructions**: For each structure (a, b, c), outline two synthetic routes using different Grignard reagents and aldehyde or ketone starting materials, followed by an acidic work-up.

**Note**: Grignard reagents are organomagnesium compounds (RMgX) that add to carbonyl compounds, forming alcohols after hydrolysis. Please ensure safety when handling these reagents.
Transcribed Image Text:**Problem 2: Synthesizing Alcohols Using Grignard Reagents** **Task**: Propose two different methods to synthesize each of the following alcohols using a Grignard reagent. **Model Example**: - Target Alcohol: Butan-2-ol (CH₃CH₂CHOHCH₃) **Method 1**: 1. React propanal (CH₃CH₂CHO) with methylmagnesium bromide (CH₃MgBr). 2. Perform acidic work-up using hydronium ion (H₃O⁺). **Method 2**: 1. React acetaldehyde (CH₃CHO) with butylmagnesium bromide (CH₃CH₂CH₂CH₂MgBr). 2. Perform acidic work-up using hydronium ion (H₃O⁺). **Target Alcohols**: a. **Alcohol Structure**: \[ \text{OH positioned on a cyclopentane with two ethyl groups.} \] b. **Alcohol Structure**: \[ \text{OH on a hexane chain with methyl branching at the third carbon.} \] c. **Alcohol Structure**: \[ \text{OH positioned on a cyclohexane with a methyl group.} \] **Instructions**: For each structure (a, b, c), outline two synthetic routes using different Grignard reagents and aldehyde or ketone starting materials, followed by an acidic work-up. **Note**: Grignard reagents are organomagnesium compounds (RMgX) that add to carbonyl compounds, forming alcohols after hydrolysis. Please ensure safety when handling these reagents.
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