The Bernthsen reaction between N‐1‐naphthyl‐2‐naphthylamine and 2‐methylbutanoic acid and its anhydride at 200–230° for seven hours gives a low yield of 12‐ or 13‐s‐butyldibenz[a,h]acridine, instead of the expected 14‐isomer. The parent molecule dibenz[a,h]acridine results from the same reaction conducted at 270° for thirteen hours. It is suggested that alkyl migration may have occurred in some other cases where the Bernthsen reaction was reported to yield 14‐alkyldibenz[a,h]acridines.
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