Question
) Vilsmeier-Haack reaction of benzofuran
Answer :
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The Vilsmeier–Haack reaction of benzofuran proceeds through electrophilic formylation using a reagent system generated from DMF and POCl₃, which produces the reactive Vilsmeier salt, a chloroiminium ion. In Organic Chemistry-II, this transformation is significant for introducing a formyl group onto heteroaromatic systems under mild conditions. Benzofuran, being an electron-rich fused heterocycle, reacts predominantly at the 2-position because this site is highly activated toward electrophilic
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