Among established methods for transforming Si–H bonds, carbonyl hydrosilylation and heterodehydrogenative coupling with alcohols catalysed by B(C6F5)3 are shown to provide exceptionally clean routes to the derivatisation of tetra-substituted disilanes such as [Ph2SiH]2, giving no products resulting from Si–Si bond cleavage. Even higher activity is observed for the borane-catalysed dehydrogenative coupling of silanes with alkyl- and arylthiols, the first examples of such Si–S bond formation in the absence of a transition metal catalyst. Clean, quantitative syntheses of a range of thiosilanes are reported, and the lability of the Si–S linkage toward subsequent alcoholysis is investigated. The crystal structure of 2,3-disila-2,2,3,3-tetramethyl-1,4-benzodioxane is presented.
在已建立的转化Si–H键的方法中,由B(
C6F5)3催化的羰基氢
硅化反应和与醇的异脱氢耦合提供了异常清洁的途径,以合成四取代二
硅烷(如[Ph2SiH]2),且未产生由于Si–Si键断裂而形成的副产物。对于
硼烷催化的
硅烷与烷基和芳基
硫醇的脱氢耦合,观察到更高的活性,这是在没有过渡
金属催化剂的情况下首次实现Si–S键形成。报告了一系列
硫硅烷的清洁、定量合成,并研究了Si–S链在随后的醇解中的不稳定性。文中还展示了2,3-二
硅-2,2,3,3-四甲基-1,4-苯
二噁烷的晶体结构。