N-4-Vinylbenzyl-N’-benzyl-1,4-diazabicyclo[2.2.2]octane was synthesized and tested to determine its ability to selectively precipitate anions. Fifty-one common anions were tested. The reagent reacted only with nine : dichromate, dithionate, ferricyanide, tetrafluoroborate, iodide, nitroferricyanide, perchlorate, persulfate, and picrate.