On the Thermal Dissociation of Organic Compounds. XII. The Effects of the Substituents on the Thermal Dissociation of Substituted Phenylureas
作者:Shoichiro Ozaki、Tsutomu Nagoya
DOI:10.1246/bcsj.30.444
日期:1957.5
synthesized. The rate constants and ρ values of thermaldissociation of these ureas in fattyacids were determined. In 1,1-diethyl-3-arylureas, the ρ value of the dissociation reaction at 95°C. in chloro-acetic acid was −0.196, and it may be concluded that the protonation process seems to be the rate-determining step in the dissociation reaction of ureas in fattyacid. The activation energy was compared with
Infrared spectroscopic and conformational studies of trisubstituted ureas containing chlorophenyl groups
作者:Yoshiuki Mido、Chizuko Furusawa
DOI:10.1016/0022-2860(82)85229-0
日期:1982.6
trans — cis isomerism about the NH-CO rotational axis is discussed in relation to the steric effect of the R 2 group, Ph-Ph interaction and inter- and intra-molecular hydrogen bonding. In dilute solution, R 2 UPhCl exists in the trans or the out form, and RPhUPhCl in the cisform o -Chlorophenyl derivatives show a monomeric v (N-H) band at a wavenumber lower than that of the other derivatives and no
摘要 为了检验引入的氯原子的影响,研究了含有氯苯基的三取代脲 R 2 UPhCl 和 RPhUPhCl [U = NC(O)NH] 在 ν(NH) 区域的红外光谱。围绕 NH-CO 旋转轴的反-反-顺异构现象与 R 2 基团的空间效应、Ph-Ph 相互作用以及分子间和分子内氢键有关。在稀溶液中,R 2 UPhCl 以反式或反式存在,而顺式 RPhUPhCl 邻氯苯基衍生物在波数低于其他衍生物的波数处显示出单体 v (NH) 带,并且没有相关联的 v (NH) ) 在浓溶液或什至在饱和溶液中的条带。