On the velocity of oxime formation of acetone, pyruvic acid, oxaloacetic acid and oG-ketoglutaric acid with hydroxylamine sulfate, the aaceleratic effects of sulphuric acid and of the acidity of these carbonyl-compounds were studied. The reactions were carried out at 0℃ and at the concentration of 10-3 mol. per litre. The effect of the latter is little but that of sulphuric acid is fairly large and characteristic for each oxime. And in presence of no acid, the relative velocity value of oxime formation : 21.3, 10.6, and 2.0 is given for each oxime of pyruvic acid, oxaloacetic acid, and acetone.
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