Reactions of bis(alkynyl)silanes with HB(C6F5)2: Formation of boryl-substituted silacyclobutene derivatives
作者:Juri Ugolotti、Gereon Dierker、Roland Fröhlich、Gerald Kehr、Gerhard Erker
DOI:10.1016/j.jorganchem.2010.09.024
日期:2011.3
R2Si(CC-SiMe3)2 [1a (Me), 1b (Ph)] with HB(C6F5)2 at low temperature (253 K (a), 273 K (b)) gives the –B(C6F5)2 substituted silacyclobutene products (4a,b) under kinetic control. Upon warming to room temperature they disappear to form the thermodynamically favoured isomeric silole derivatives (2a,b). Similar treatment of Me2Si(CC–R1)2 [5a (R1 = Ph), 5b (R1 = tert-butyl) with HB(C6F5)2 at room temperature
在低温下(253 K(a),273 K(b))用HB(C 6 F 5)2处理R 2 Si(C C-SiMe 3)2 [ 1a(Me),1b(Ph)]在动力学控制下–B(C 6 F 5)2取代的硅环丁烯产物(4a,b)。温热至室温后,它们消失以形成热力学上有利的异构硅烷衍生物(2a,b)。Me 2 Si(C C–R的相似处理1)2 [ 5a(R 1 = Ph),5b(R 1 =叔丁基)与HB(C 6 F 5)2在室温下得到稳定的–B(C 6 F 5)2取代的硅环丁烯衍生物6和分别为7。随后的光解作用导致这些产物中取代的环外C C双键从Z-到E-异构化。通过X射线晶体结构分析表征了硅杂环丁烯衍生物E - 6。