
AbstractDie protonenkatalysierte Umsetzung von Arylcyanaten mit Dimethylsulfoxid liefert im ersten Reaktionsschritt Carbamidsäureester, die bei längerer Reaktionsdauer oder erhöhter Temperatur durch intermediär gebildeten Formaldehyd zu N.N′‐Methylen‐bis‐[carbamidsäurearylestern] (5) kondensieren. Der Mechanismus des Primärschritts wird als ein der Pummerer‐Reaktion analoger Zerfall eines aktivierten Komplexes aus Arylcyanat, Dimethylsulfoxid und Proton erkannt.
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