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温度

0 °C

A solution of cyanogen bromide (2.12 g., 0.02 moles) in ether (20 ml.) was added dropwise over 35 minutes to a stirred ice-cooled solution of aminoacetaldehyde diethyl acetal (5.32 g., 0.04 moles) in ether (20 ml.). During this addition a white precipitate was formed. The resulting suspension was stirred at 0° C. for a further hour, filtered and the filtrate evaporated to dryness under reduced pressure to give 2,2-diethoxyethylcyanamide (3.47 g., 110%) as a colourless oily liquid having the following n.m.r. spectrum in CDCl3 : 1.24 (t, 6H); 3.1 (d, 2H); 3.65 (m, 4H); 4.0 (br s, 1H); 4.57 (t, 1H).

1. additionDuring this addition a white precipitate
2. customwas formed
3. filtrationfiltered
4. customthe filtrate evaporated to dryness under reduced pressure