Abstract
Cyclization of the 3,3′-dimethyl-4,4′-diphenylendihydrazone of ethyl pyruvate in polyphosphoric ester gave 7,7′-dimethyl-2,2′-dicarbethoxy-5,5′-bis-1H-indole which was hydrolyzed and decarboxylated to give 7,7′-dimethyl-5,5′-bis-1H-indole.
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