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Route finder: The Passerini three‐component reaction of a carboxylic acid, an aldehyde (or ketone), and an isocyanide to give an α‐acyloxycarboxamide actually follows a four‐component mechanism involving an additional molecule of carboxylic acid (see scheme). The discovery was made by applying a new “reaction route explorer” to the simplest Passerini reaction (HCOOH+HCHO+CH3NC).
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