July, 1965] Stereospecific Formation of a-Aminoalcohols 1159 obtained by the treatment of bromoacetal (III) with dimethylamine in benzene. Besides the expected product (IV) (bp 34—36°C/0.2 mmHg), a small amount of a fraction (bp 67—72°C/4 mmHg) was obtained through distil- lation. Since the latter compound showed in the infrared spectrum strong bands at 1640, 1605 (a, ¿S-unsaturated carbonyl system), 1050 cm-1 (ether), and a positive test to sodium ...