反应详情

温度

20 °C

30 ml. of α-methylstyrene was placed in a 200 ml. reactor, and while externally cooling with ice, anhydrous hydrochloric acid was introduced at 0 to 10° C. When the weight of the mixture increased by 1.8 g, the introduction of the hydrochloric acid was stopped. 11.3 g of p-tolylurea and 40 parts of acetonitrile were added, and with stirring, the mixture was heated. After heating it for 4 hours at 40 ± 2° C., the reaction mixture was maintained at 20° C. for 3 days. The precipitated crystals were collected, and recrystallized from 70% methanol to afford 13.5 g of N-(α,α-dimethylbenzyl)-N'-(p-tolyl)urea having a melting point of 203° C.

1. additionwas introduced at 0 to 10° C
2. temperatureWhen the weight of the mixture increased by 1.8 g
3. temperaturethe mixture was heated
4. temperatureAfter heating it for 4 hours at 40 ± 2° C.
5. customThe precipitated crystals were collected
6. customrecrystallized from 70% methanol