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Vilsmeier-Haack reactions in Synthesis of …
shodhganga.inflibnet.ac.inChapter 2 Vilsmeier-Haack reactions in Synthesis of Heterocycles: An Overview 2.1 Introduction In 1927 Vilsmeier and Haack observed that N-methylformanilide can formylate aniline derivatives in the presence of POCl