Synthesis of silicon-functionalized 7-silanorbornadienes and their thermolysis and photolysis
作者:Masahiro Okimoto、Atsushi Kawachi、Yohsuke Yamamoto
DOI:10.1016/j.jorganchem.2008.12.040
日期:2009.4
1e. Stereochemistry at the bridging silicon during these transformations was determined by X-ray crystallographic analysis. Thermolysis of 1 produced corresponding silylenes 5, which were trapped with triethylsilane to give disilanes 6. Photolysis of 1 except 1c also afforded corresponding silylenes 5. Theoretical calculation of the models of silanorbornadienes was performed at the MP2/6-31+G(d, p)
制备了一系列的7-硅氧烷基降冰片二烯,并通过X射线晶体学分析进行了表征。通过1-mesityl-2,3,4,5-的[4 + 2]环加成反应制备了2,3-Benzo-7-mesityl-1,4,5,6-四苯基-7-硅烷基硼二烯(1a)。具有苯并炔的四苯基-1-sila-2,4-环戊二烯(4)。将7-羟基1a转化为7-氯取代的硅烷基降冰片二烯1b。用苯酰胺锂和苯硫醇锂处理1b,分别得到7-苯基氨基取代的硅烷基降冰片二烯1c和7-苯硫基取代的硅烷基降冰片二烯1d。1b的还原锂化与萘二甲酸锂一起,得到7-硅烷基化的硅烷基降冰片二烯1f,其与氯三甲基硅烷反应,得到7-三甲基甲硅烷基取代的硅烷基降冰片二烯1e。通过X射线晶体学分析确定在这些转变过程中在桥接硅处的立体化学。热分解1个产生相应硅烯5,其被困用三乙基硅烷,得到乙硅烷6。除1c以外的其他1的光解还提供相应的甲硅烷基5。在MP2 / 6-31 +