has specified product acridines acridine synthesis Bernthsen acridine synthesis 2014-03-12T09:00:00Z Bernthsen reaction Definition source Merck Index, modified for errors. RXNO RXNO:0000519 Reaction of a diarylamine in an organic acid or anhydride in the presence of zinc chloride to yield a 9-substituted acridine. batchelorc doi:10.1039/b204243f https://www.rsc.org/Merck-Index/reaction/r41/