(E)-1-Aryl-2-(methylsulfinyl)-2-(methylthio)ethene, obtained by the Knoevenagel-type condensation of methyl (methylthio) methyl sulfoxide with the corresponding aromatic aldehyde, was found to react with ethylmagnesium chloride to give (Z)-1-aryl-2-(methylthio)ethene predominantly. Since the reaction of (Z)-1-(methylsulfinyl)-1-(methylthio)-2-phenylethene afforded (E)-1-(methylthio)-2-phenylethene
(E)-1-Aryl-2-(methylsulfinyl)-2-(methylthio)ethene,通过甲基(甲
硫基)甲基亚砜与相应的芳香醛的 Knoevenagel 型缩合获得,发现与
氯化乙基
镁反应得到(Z)-1-芳基-2-(甲
硫基)
乙烯占优势。由于(Z)-1-(甲基亚磺酰基)-1-(甲
硫基)-2-苯基
乙烯的反应得到(E)-1-(甲
硫基)-2-苯基
乙烯,本反应似乎是立体定向的。