UV/vis spectrophotometric determination of slow equilibrated N(1)-H missing deprotonation constant of a pyrimidine and thiopyrimidine: The final situation of the four pK values
作者:H. Kılıç
DOI:10.1016/j.saa.2019.117867
日期:2020.3
detection of related equilibration time. The missing acidity constants for each of I and II were determined in 5.0% v/v aqueous methanol. Plausible acid base equilibrium mechanism for the missing acidity constant was presented for each of the compounds based on the extensive experimental UV/vis data. In this context, all the acid base equilibria for each of the regarding compounds were completely revised
最近合成的5-苯甲酰基-1-(甲基苯基亚甲基氨基)-4-苯基-1H-嘧啶-2-酮(I)和5-苯甲酰基-1-(甲基苯基亚甲基氨基)-4-苯基-1H-嘧啶-的缺失酸度常数在25±0.1°C的温度下,通过对其老化溶液进行UV / vis光谱分析,研究了I在1.0到3.20和II在1.0到4.06的pH值下,2-硫酮(II)作为时间的函数。在这项研究中,开发了一种新颖的时间依赖性等渗点方法,以确认任何弱酸碱平衡的存在以及相关平衡时间的检测。在5.0%v / v的甲醇水溶液中测定I和II各自缺失的酸度常数。根据广泛的实验UV / vis数据,为每种化合物提供了缺失酸度常数的合理的酸碱平衡机理。