sufficient quantity of carbonyl-free methanol is added prior to titration. Effects of Reagent Concentration and Solvent on Oximation Rate. The reaction rates of butyraldehyde with various concentrations of hydroxylamnionium formate in a niethanol-methyl Cellosolve medium are illustrated in the top portion of Figure 2 . Slow, uncertain reactions are obtained with 0.02N and 0.05.\\- reagents, wvhcrcas normalities of 0.1 and 0.25 provide quantitat,ive rpsulti within 30 minutes. To conipare the effect of various sulvent media on the rate of osimation, the reaction rates of butyraldehyde with 3.02.11 reagent' were studied in several media. Figure 2 (bottom) shows reaction curves for butyraldehyde in the conventional methanol-methyl Cello-
solve mistuw, in isopropyl alcohol, and in benzene. The differences in reactivity are caused by hydrogen bonding effect
