反应详情

78 g of N-methyl-N'-cyclohexyl urea, 220 g of cresol and 72 g of dimethyl maleate were stirred at 185° C for one hour and then at 200° C for one hour. 15 g of methanol distilled over during this time. After fractional distillation, a main fraction boiling at 180°-185° C/0.08 Torr could be isolated. It consisted of an isomeric mixture of 1-methyl-3-cyclohexyl-hydantoin and 1-cyclohexyl-3-methylhydantoin but its exact composition could not be determined by gas chromatography.

1. distillation15 g of methanol distilled over during this time
2. distillationAfter fractional distillation
3. customa main fraction boiling at 180°-185° C/0.08 Torr could be isolated