Influence of the Silyl Group on the Reactivity of Some Ortho-Lithiated Aryl Alkyl Sulfides
作者:Krzysztof Durka、Tomasz Kliś、Janusz Serwatowski、Krzysztof Woźniak
DOI:10.1021/om400236x
日期:2013.6.10
The lithiation of brominated aryl (α-dimethylsilyl)alkyl sulfides in diethyl ether produces stable heterocyclic silanes, which were characterized by 1H, 13C, and 29Si NMR spectroscopy and by X-ray crystallography. The reaction involves the intramolecular attack of the phenyl carbanion on the silicon atom with the formation of a pentacoordinated silicon intermediate. The stability of the formed intermediate
溴化芳基(α-二甲基甲硅烷基)烷基硫醚在乙醚中的锂化反应生成稳定的杂环硅烷,其特征在于1 H,13 C和29 Si NMR光谱学以及X射线晶体学。该反应涉及苯基碳负离子对硅原子的分子内攻击并形成五配位的硅中间体。形成的中间体的稳定性取决于溶剂。它在−78°C的四氢呋喃中容易分解,并且具有Si–C键断裂。但是,在室温下,它在乙醚中是稳定的。加水会导致Si–H键断裂,而含有硅原子的杂环则是保守的。