反应详情

A solution of 4-chloroaniline (64 grams; 0.5 mol) in toluene (100 ml) is placed into a suitable pressure vessel, and is cooled in an acetone-dry ice bath. Trifluoromethyl isocyanate (56 grams; 0.5 mol) is added thereto and the pressure vessel is sealed. The reaction mixture is allowed to warm up to room temperature and stand for a period of about 24 hours. After this time the pressure vessel is opened and the contents are stripped of toluene under reduced pressure. The residue is recrystallized to yield N-(4-chlorophenyl)-N'-trifluoromethyl urea.

1. temperatureis cooled in an acetone-dry ice bath
2. customthe pressure vessel is sealed
3. customThe residue is recrystallized