反应详情

温度

0 °C

23.9 g of N-phenyldiethanol amine were ground in a mortar and dissolved in 50 ml conc. HCl. The solution was then cooled to 0°C and 10 g NaNO2 in 25 ml of water were added over a period of one hour with stirring. The temperature was maintained between 0°-5°C. After the addition was complete, the mixture was stirred one hour more and then filtered. The orange precipitate of 4-nitroso-N,N-bis-(β-hydroxyethyl) aniline formed was dried in a vacuum desiccator overnight. The dried product, amounting to 25.0 g was suspended in 150 ml. isopropanol and reduced on a Parr hydrogenator over Pt/C. When the loss in pressure approached theoretical, the mixture was filtered into a flask containing 200 ml. isopropanol saturated with HCl gas. A stream of HCl gas was passed through the filtrate during the filtration and for about 20 minutes after the filtration was complete. The white precipitate of N,N-bis-(β-hydroxyethyl)-p-phenylenediamine hydrochloride was collected and weighed. Yield 19.8 g.

1. temperatureThe temperature was maintained between 0°-5°C
2. additionAfter the addition
3. stirringthe mixture was stirred one hour more
4. filtrationfiltered