Reduction of alloxan in aqueous solution. I. By hydrogen sulfide

Study of the reduction of alloxan in aqueous solution with hydroen sulfide reveals that, in deciding the procfucts formed (at 25° or the boiling temperature), temperature is not a factor (except in so far as decomposition may be accelerated by rise in temperature). It is possible, by appropriate choice of the roportion of hydrogen sulfide introduce to produce at will alloxantin dihydrate or dia-luric acid monohydrate, regardless of the temperature or the initial alloxan concentration.