反应详情

50 g (0.378 Mol) of ethylallophanate and 76.6 g (0.416 Mol) of 1,2-diphenylhydrazine were suspended in 100 ml of anhydrous xylene and refluxed for 6 hours with stirring, during which time ammonia was released. The solvent was distilled off, the residue was mixed with 150 ml of xylene once more and refluxed for 1 hour. The mixture was left to cool, the reaction product was suction filtered, and thoroughly washed with cold xylene. After drying in vacuo, 60.0 g (63% of theory) of colourless crystals were obtained, mp. 216°-217° C.

1. temperaturerefluxed for 6 hours
2. distillationThe solvent was distilled off
3. additionthe residue was mixed with 150 ml of xylene once more
4. temperaturerefluxed for 1 hour
5. waitThe mixture was left
6. temperatureto cool
7. filtrationfiltered
8. washthoroughly washed with cold xylene
9. customAfter drying in vacuo, 60.0 g (63% of theory) of colourless crystals
10. customwere obtained