Circle the halogenated compounds that can be used successfully to prepare a Grignard reagent for alcohol synthesis by subsequent reaction with an aldehyde or ketone. For those not circled, explain in complete sentences why they cannot be used to make a Grignard reagent. H Br Br H OH CI H

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Circle the halogenated compounds that can be used successfully to prepare a Grignard reagent for alcohol synthesis by subsequent reaction with an aldehyde or ketone. For those not circled, explain in complete sentences why they cannot be used to make a Grignard reagent.

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**Title: Grignard Reagent Formation and Halogenated Compound Selection**

**Instructions:**
Identify the halogenated compounds that are suitable for the preparation of Grignard reagents, which can be used for alcohol synthesis through reactions with aldehydes or ketones. Circle these compounds. For those that are not suitable, provide an explanation in complete sentences detailing why they cannot be used to make a Grignard reagent.

**Compounds:**

1. **Compound 1**: A brominated compound with a three-carbon chain and a single bond configuration that appears suitable for Grignard reagent formation.

2. **Compound 2**: A chlorinated compound with an adjacent alcohol group within a three-carbon chain. 
   - *Explanation*: This compound cannot be used to make a Grignard reagent as the presence of the hydroxyl group (OH) will react with the Grignard reagent, preventing its formation.

3. **Compound 3**: An iodinated compound with a three-carbon chain and a double bond.
   - *Note*: This compound could be evaluated for stability during the Grignard reaction setup.

4. **Compound 4**: A brominated compound adjacent to an alkyne group within a four-carbon chain.
   - *Explanation*: The presence of the acidic hydrogen in the alkyne group (terminal alkyne) can react with Grignard reagents, preventing their proper formation. 

By understanding the reasons behind the selection or exclusion of certain halogenated compounds, students can better grasp the intricacies of Grignard reagent preparation and its application in synthetic organic chemistry.
Transcribed Image Text:**Title: Grignard Reagent Formation and Halogenated Compound Selection** **Instructions:** Identify the halogenated compounds that are suitable for the preparation of Grignard reagents, which can be used for alcohol synthesis through reactions with aldehydes or ketones. Circle these compounds. For those that are not suitable, provide an explanation in complete sentences detailing why they cannot be used to make a Grignard reagent. **Compounds:** 1. **Compound 1**: A brominated compound with a three-carbon chain and a single bond configuration that appears suitable for Grignard reagent formation. 2. **Compound 2**: A chlorinated compound with an adjacent alcohol group within a three-carbon chain. - *Explanation*: This compound cannot be used to make a Grignard reagent as the presence of the hydroxyl group (OH) will react with the Grignard reagent, preventing its formation. 3. **Compound 3**: An iodinated compound with a three-carbon chain and a double bond. - *Note*: This compound could be evaluated for stability during the Grignard reaction setup. 4. **Compound 4**: A brominated compound adjacent to an alkyne group within a four-carbon chain. - *Explanation*: The presence of the acidic hydrogen in the alkyne group (terminal alkyne) can react with Grignard reagents, preventing their proper formation. By understanding the reasons behind the selection or exclusion of certain halogenated compounds, students can better grasp the intricacies of Grignard reagent preparation and its application in synthetic organic chemistry.
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