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Answer :
Final answer:
Grignard reagents add to dimethyl formamide once due to the dual role of DMF as a Lewis acid and a Lewis base. The formation of a magnesium complex and subsequent nucleophilic addition to DMF's carbonyl carbon are key steps in the mechanism.
Explanation:
Grignard reagents react differently with dimethyl formamide (DMF) compared to esters. In contrast to their addition to esters, Grignard reagents add to DMF once. This is because DMF acts as both a Lewis acid and a Lewis base, allowing it to form a complex intermediate with the Grignard reagent. The proposed mechanism for the reaction involves the formation of a magnesium complex followed by nucleophilic addition of the Grignard reagent to the carbonyl carbon of DMF.
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