作者:Ryuichi Shiba、Miyuki Takahashi、Toichi Ebisuno、Michiaki Takimoto
DOI:10.1246/bcsj.62.1930
日期:1989.6
The investigation of the reactions of urea and its methyl derivatives with formaldehyde elucidated the formation pathway of 3,5-bis(methoxymethyl)perhydro-1,3,5-oxadiazin-4-one. 1) The addition of formaldehyde to urea became increasingly difficult according to the increase of the number of added formaldehyde molecules, probably because of the steric hindrance of the hydroxymethyl groups. 2) 3,5-Bis(methoxymethyl)perhydro-1,3,5-oxadiazin-4-one was concluded to be derived from urea via tris(hydroxymethyl)urea and 3-(hydroxymethyl)perhydro-1,3,5-oxadiazin-4-one but not via tetrakis(hydroxymethyl)urea or perhydro-1,3,5-oxadiazin-4-one.
对尿素及其甲基衍生物与甲醛的反应的研究阐明了3,5-双(甲氧基甲基)全氢-1,3,5-氧二嗪-4-酮的形成途径。1) 随着甲醛分子数量的增加,尿素与甲醛的加成反应变得越来越困难,这可能是由于羟甲基的立体位阻造成的。2) 3,5-双(甲氧基甲基)全氢-1,3,5-氧二嗪-4-酮被认为是通过三(羟甲基)脲和3-(羟甲基)全氢-1,3,5-氧二嗪-4-酮从尿素中衍生出来的,而不是通过四(羟甲基)脲或全氢-1,3,5-氧二嗪-4-酮。