反应条件
urea in neat (no solvent) heating (200-210°C, within 30 min, N2 atmosphere), heating (200-210°C, 1 h), cooling; crushing, treatment with dild. NaOH (70°C), hot filtration, washing (H2O and dild. HCl, pH = 7), drying, dissolution (benzene), chromy. (Al2O3, benzene), evapn., heating (1E-4 Torr, 230-240°C); elem. anal.;
参考文献
Freyer, Wolfgang; Minh, Le quoc
Monatshefte fuer Chemie, 1986 , vol. 117, p. 475 - 490