Some 2-substituted-1H-phenantro [9, 10-d] imidazole compounds were synthesized and their analgesic activities were determined on the Swiss albino mice (25-35 g) of either sex. In the synthesis, phenantre-nequinone molecule was reacted with different aldehyde derivatives in acetic acid presence of ammonium acetate and finally 16 compounds were gained. All spectral and elemental analyses of the original compounds were completed and their structures were elucidated. Analgesic activity of the compounds were examined by using the Tail-Clip method. 2-Phenyl-1H-phenantro [9, 10-d] imidazole (comp.1) and 2-(4-chlorophenyl)-1H-phenantro [9, 10-d] imidazole (comp. 6) were found to be more active than the others and their LD50 values were found to be greater than 100 mg/kg (i.p.).
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