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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 _______ _________ _________ ______ ________ ____.
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