Stereoselective formation of 2-aryl-5-halo-2-pentenyl methyl sulfoxides and sulfones is achieved by treatment of 2-aryl-2-cyclopropyl-2-hydroxyethyl methyl sulfoxides or sulfones, respectively, with hydrogen halides. In all cases, only the Z-isomer is isolated except for the 2-thiophenyl derivative which is designated as the E-isomer in accord with the Cahn sequence rule. Structures were determined by 1H-NMR spectrometry and for one product by X-ray crystallography.
2-芳基-5-卤代-2-戊烯基甲基亚砜和砜的立体选择性形成是通过分别用卤化氢处理2-芳基-2-环丙基-2-羟乙基甲基亚砜或砜来实现的。在所有情况下,仅分离出Z-异构体,但2-噻吩衍生物除外,根据卡恩序列规则将其指定为E-异构体。通过 1 H-NMR 光谱测定确定结构,并通过 X 射线晶体学测定一种产物的结构。