The Steric Effects of Alkyl Groups on the N–H Stretching Vibrations and the Rotational Isomerism of Alkylureas
作者:Yoshiyuki Mido、Tamotsu Gohda
DOI:10.1246/bcsj.48.2704
日期:1975.10
of the trans N–H band. It was also observed that the larger the effective size of the R′ group on R2UR′ is, the stronger the intensity of the additional band becomes. It was concluded, in connection with the rotational isomerism of dialkylureas, that the additional band arises from a form in which the N–H group is out of the skeletal plane.
研究了各种三烷基脲 R2UR' 在稀溶液中的自由 N-H 伸缩振动,以解决我们关于二烷基脲旋转异构的问题。在 R2UR' 的红外光谱中,其中 R 是异丙基或环己基,在反式 N-H 带的高频侧出现了一个额外的 N-H 带。还观察到R2UR'上R'基团的有效尺寸越大,附加带的强度变得越强。与二烷基脲的旋转异构相关的结论是,附加带是由 N-H 基团在骨架平面之外的形式产生的。