A series of l-substituted 2, 4-dinitroimidazole analogues have been synthesized and tested for their radiosensitizing ability for selectively sensitizing hypoxic mammalian cells to the lethal effect of radiation. The reaction of 2, 4-(5)-dinitroimidazole (1) with a variety of oxiranes upon heating in absolute ethanol yielded the expected l-substituted 2, 4- dinitroimidazoles (2) and also resulted in the formation of a novel class of isomeric ...