The fractionation factor for the exchange reaction between ammonia and ammonium nitrate was determined as a function of the dissolved ammonia content. It was found that for a stock solution containing 59.3-59.6 percent ammonium nitratewhere IX is the fractionation factor at 25'C and M the fraction (Moles NHs)/(Moles NHs +Moles NH,NOs), in solution. From these data, the equilibrium constant for the exchange reaction NI4H.+(sol) + NI5H 3(gas)=;N16H. +(sol) + NJ4Hs(gas) was calculated to be 1.034, while that for the reaction N!4H s(sol) + NIGH 3 (gas )=;NJ6H s(sol) + N14Hs(gas) was found to be 1.005. Vapor pressure and density data were determined for the ammoniaammonium nitrate solutions as a function of the ammonia concentration.

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and 50 lb. of hydrogen pressure were used in each case. With ester II and platinum oxide catalyst, the reaction was complete in twenty minutes; with palladous oxide, the reaction required four hours. Ester III was reduced in two to four hours using platinum and, incompletely, after seven hours with palladium.The saturated ester (IV) was recovered upon fractionation of the alcoholic solution and identified by its boiling point, density and refractive index. 14 Degradation of High Boiling Ester (III).-Seven grams (0.05 mole) of the ester, boiling at 169°, was treated with 0.05 mole of hydrogen peroxide and 2 ml. of osmium tetroxide catalyst according to the procedure of Milas and Sussman.11 The gray solution was distilled under diminished pressure. The fraction boiling from 62 to 73 °contained the glycol (VII). This was treated with successive small portions of perchlorate -cerate ion in perchloric acid, "Ceric perchlorate,"12 (10 g. (NH4)2Ce(N03)6 in 50 ml. of 15 to 20% perchloric acid) until a red color ivas no longer formed. Air was blown through the warmed solution and then into a test-tube containing 2,4-dinitro-

was washed with tetrahydrofuran (20 ml.), and the hygroscopic product (Ilia) was dried in vacuo over phosphorus pentoxide at 78°for 18 hr.: yield, 170 mg.; this solid decomposes rapidly without melting above 200°; in µ (c 10-3) at pH 7, 320(15.3), and at pH 13, 319 (15.7); ¡win cm.-13435 (broad, OH or

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