反应详情

305 g (1 mol) of 4-phenoxy-2,6-diisopropylaniline hydrochloride, 97 g (1.2 mol) of sodium thiocyanate, 10 ml of water and 10 ml of concentrated hydrochloric acid are suspended in 800 ml of o-xylene. The mixture is heated to 90° C. over 6 hours, during which time 2 ml of concentrated hydrochloric acid are added after 3 hours and then after each further hour. Thereafter the reaction mixture is cooled to room temperature and the product is isolated by filtration, washed with water and dried, giving 315 g (96% of theory) of N-(4-phenoxy-2,6-diisopropylphenyl)thiourea in the form of pale grey crystals which melt at 219°-221° C.

1. additionare added after 3 hours
2. waitafter each further hour
3. customthe product is isolated by filtration
4. washwashed with water
5. customdried