反应详情

37 g (0.2 mole) of para-[N-(β-amino-ethyl)]amino nitrobenzene is dissolved in 200 cm3 of water at 30° C, to which 15 cm3 (0.26 mole) of acetic acid had been added. 17 g (0.21 mole) of potassium isocyanate is then rapidly added. The desired product precipitates immediately in a form which is very difficult to dry. 150 cm3 of acetic acid is added to the reaction mixture and it is heated until the urein is completely dissolved. After slow cooling, drying yields 33 g of para-[N-(β-ureidoethyl)]amino nitrobenzene in a well crystallized form, which is practically prue and melts at 187° C.

1. additionhad been added
2. customThe desired product precipitates immediately in a form which
3. customto dry
4. addition150 cm3 of acetic acid is added to the reaction mixture and it
5. temperatureis heated until the urein
6. dissolutionis completely dissolved
7. customAfter slow cooling, drying