反应详情

温度

80 °C

558 Parts of aniline, 479 parts of ammonium rhodanide and 78 parts of a 40% aqueous sodium bisulfite solution are introduced successively into 592 parts of a 37% aqueous hydrochloric acid. This reaction mixture is at first stirred for 8 hours at 80° C., then for 8 hours at 90° C., thereafter cooled to 20° C.; the precipitate formed is filtered off with suction, washed until neutral and dried. 888 Parts (corresponding to 97.4% of the theory) of phenyl thiourea are obtained, which product has a melting point in the range of from 148° to 150° C.

1. waitfor 8 hours at 90° C.
2. temperaturecooled to 20° C.
3. customthe precipitate formed
4. filtrationis filtered off with suction
5. washwashed until neutral and
6. customdried