Vol. 75 0.86 g. (0.01 mole) of vinyl ether, 0.098 g. (0.001 mole) of potassium acetate and 0.5 ml. of glacial acetic acid (0.01 mole) dissolved in 100 ml. of 80% dioxane. The solutions were sealed in Cams tubes and heated on a steam-bath for 64.5 hours. Distillation of the contents of one of the tubes into a 25-ml. portion of 2,4-dinitrophenylhydrazine reagent yielded no precipitate even on standing. Dilution of this same solution with water did yield a small amount of precipitate (less than 0.1 g.) melting point 174-177°, mixed m.p. with isobutyraldehyde 2,4-dmitrophenylhydrazone, 175-180°. The contents of the second tube were distilled into freshly prepared Fehling solution. No precipitate developed.Rate Measurements.-The rate measurements in anhydrous acetic acid and in "80%" dioxane were carried out as in previous work.3•5 The "80%" dioxane was the same solvent described previously.3 Good first order kinetics were observed.
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