A series of fluorinated 4-alkyl/aryl-2-fluoroaryl-1H-1,5-benzodiazepines (3
a-3o) were prepared by treating appropriate fluorinated 1,3-diketone with o
-phenylenediamine. These Compounds (3a-3o) were isolated as their monohydro
chloride/monoperchlorate or as a free base and characterized by their analy
tical and spectral data. Some of these 4-alkyl/aryl-2-fluoroaryl-1H-1,5-ben
zodiazepines have exhibited excellent gastric acid secretion pylorus ligati
on, passive cutaneous anaphylaxis and parasitological activities in rats an
d monkeys.