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derivatives have been prepared in moderate yields by the reaction of 9-bromo-or 9-fluoroacridizinium salts with selected amines. In contrast, the reaction with primary alkylamines gives only traces of the substitution product. The reaction of 9-fluoroacridizinium bromide with thiophenol yields 9-(phenylsulfanyl)acridizinium salt. The 9-(methylsulfanyl)acridizinium salt was prepared by the cyclodehydration of the pyridinium precursor.doi:10.3998/ark.5550190.0008.813 fatcat:ohaauqjrkbfvvcl6ieqr3ok37u