Configurational Stability of Optically Active Dichloromethyl<i>p</i>-Tolyl Sulfoxide and Its Anionic Species: Experimental and Theoretical Study
作者:Tsutomu Kimura、Takahiro Tsuru、Hitoshi Momochi、Tsuyoshi Satoh
DOI:10.1002/hc.21074
日期:2013.3
Racemization of optically active dichloromethyl p-tolyl sulfoxide took place at −78°C in the presence of potassium bis(trimethylsilyl)amide (KHMDS), while the same racemization did not occur under reflux in toluene in the absence of KHMDS. Density functional theory calculations suggested that the pyramidal inversion at the sulfur center was unlikely to be involved in the racemization mechanism. An
在双(三甲基甲硅烷基)酰胺钾(KHMDS)存在下,光学活性二氯甲基对甲苯基亚砜的外消旋化发生在 -78°C,而在不存在 KHMDS 的情况下,在甲苯中回流下不会发生相同的外消旋化。密度泛函理论计算表明硫中心的锥体反转不太可能参与外消旋化机制。发现亚砜的阴离子物质逐渐转化为氯双(对甲苯基亚磺酰基)甲烷和二氯卡宾。我们提出了由非手性对甲苯磺酸钾和氯(对甲苯基亚磺酰基)亚甲基介导的外消旋化机制。© 2013 Wiley Periodicals, Inc. 杂原子化学 24:131–137, 2013; 在 wileyonlinelibrary.com 上在线查看这篇文章。DOI 10.1002/hc.21074