A cyclic acetal is treated with a Grignard reagent. The resulting compound is a(n):Select answer from the options belowketone. aldeyhde.carboxylic acid.alcohol.No reaction has occurred; the cyclic acetal is protected from Grignard attack.Save for LaterSubmit Answer
Question
A cyclic acetal is treated with a Grignard reagent. The resulting compound is a(n):Select answer from the options belowketone. aldeyhde.carboxylic acid.alcohol.No reaction has occurred; the cyclic acetal is protected from Grignard attack.Save for LaterSubmit Answer
Solution
No reaction has occurred; the cyclic acetal is protected from Grignard attack.
Here's why:
Grignard reagents are strong nucleophiles and bases. They can react with carbonyl compounds like aldehydes, ketones, and esters to form alcohols. However, acetals, including cyclic acetals, are resistant to nucleophilic attack. This is because the carbonyl carbon (the electrophilic site where the Grignard reagent would typically attack) is no longer present in an acetal. Instead, it has been converted into an ether (R-O-R'), which is not susceptible to attack by nucleophiles like the Grignard reagent. Therefore, the cyclic acetal remains unchanged, and no reaction occurs.
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