The E/Z-isomers of 2,4-dineopentyl-1,3-disilacyclobutanes (R1R1SiCHCH2tBu)2 are obtained in good yields from the reaction of diorganovinylchlorosilanes R1R2Si(Cl)CHCH2 with LitBu in non-polar solvents. This synthetic route becomes less attractive as the number of chlorosubstituents at the vinylsilane increases: Thus, tetrachloro-2,4-dineopentyl-1,3-disilacyclobutane (2) cannot be prepared from Cl3SiCHCH2
由二有机基
乙烯基氯硅烷R 1 R 2 Si(Cl)CH = CH的反应以良好的产率获得
2,4-二
烯戊基-1,3-二
硅环丁烷(R 1 R 1 SiCHCH 2 t Bu)2的E / Z-异构体。2用Lit Bu于非极性溶剂中。随着
乙烯基硅烷上
氯取代基数量的增加,该合成路线的吸引力降低:因此,无法从Cl 3 SiCH = CH 2(1)和Li t制备四
氯-
2,4-二
烯戊基-1,3-二
硅环丁烷(2)制备规模的Bu。向1 / Li t Bu的混合物中加入两倍摩尔量的NEt 3导致形成这种碱性二
硅环
环丁烷作为唯一的反应产物,几乎定量地收率。显然,双-供体稳定neopentylsilene(ET 3 N)2 ·
氯2 SiCHCH 2吨卜(δ),其反应性比得上diorganoneopentylsilenes - [R 2 SiCHCH 2吨Bu(R = Me,Ph)负责该干净的反应。这些实验结果与δ