unsymnietric ureas非对称脲
substituted ureas取代脲
Ureas resin尿素树脂
aryl ureas芳基脲
amidino ureas脒基碳酰胺
Benzothiazole Ureas苯并噻唑脲
aroyl ureas芳酰基脲
methylene ureas亚甲基脲
cyclic ureas环尿素
As for ureas, it was rather complicated. Urea and N-methyl urea gave complex mixutures.
对脲的反应情况比较特别,脲素、甲基脲都生成复杂的混合物,只对苯基脲反应较好。
参考来源 - 固体酸碱催化的非均相有机反应研究N（名词） a white water-soluble crystalline compound with a saline taste and often an odour of ammonia, produced by protein metabolism and excreted in urine. A synthetic form is used as a fertilizer, animal feed, and in the manufacture of synthetic resins. Formula: CO(NH2)2 脲 (Also called carbamide)