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Nur Sauerstoff und Säure! Die oxidative Kupplung von Xanthen und anderen aktivierten Benzylverbindungen mit Nukleophilen wie Ketonen benötigt lediglich Sauerstoff und katalytische Mengen an Methansulfonsäure. Lösungsmittel sind nicht erforderlich. Der vorgeschlagene Reaktionsmechanismus umfasst die Substrataktivierung durch Bildung eines Hydroperoxids. Daher kann diese Methode als „autoxidative Kupplungsreaktion“...
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