Die 3‐Methyl‐ bzw. 3‐Phenyl‐indole, ‐benzofurane und ‐benzothiophene (I) gehen bei 15 ‐420minütiger Erwärmung mit Pyrophosphorsäure auf 100 bis 150°C in die 2‐substituierten Isomeren (IV) (Ausbeute 10‐90%) über.
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