Intramolecular rearrangement of organosilyl groups between oxygen and nitrogen in aminosiloxanes – a joint experimental–theoretical study, part II
作者:Susanne Kliem、Uwe Klingebiel、Mathias Noltemeyer、Stefan Schmatz
DOI:10.1016/j.jorganchem.2004.10.055
日期:2005.2
the lithium salts of amino-1,3-disiloxanes, (Me3C)2SiNH2–O–R (R = SiMe3, SiMe2Ph, SiF2CMe3) reacts with ClSiMe3, FSiMe2Ph or F3SiCMe3 under a 1,3-O-N-silyl group migration to give the 1-silylamino-1,3-disiloxanes 9–11. If the trimethylsilyl group is substituted by SiMeF2, the difference between the isomers III′ and V′ is even smaller, 0.12 kcal/mol, and the barrier to reaction via the dyotropic transition
锂氨基二-叔-butylsilanolate发生反应与卤代硅烷,得到1-甲硅烷基-1,3-硅氧烷(1 - 7)。四(1-甲硅烷)硅氧烷热冷凝,得到螺环六元环(8)。之一六元环8所形成船,而另一个具有一个捻构象。氨基二硅氧烷的锂盐形成甲硅烷基-硅烷醇化物或酰氨基二硅氧烷。第一类包括从氧与氮原子1,3-甲硅烷基的迁移。模型化合物的同分异构的锂盐的能量被计算,并显示出锂三甲基甲硅烷- dimethylsilanolate III为0.7千卡/摩尔以上的同分异构的锂-1,3- disiloxaneamide稳定V。实验结果表明,2-氨基-1,3-二硅氧烷的锂盐,(ME 3 C)2的sinh 2 -O-R(R =森达3,森达2 PH,的SiF 2 CME 3)反应以ClSiMe 3,FSiMe 2博士或F 3 SICME 3 1,3- ON-甲硅烷基迁移下,得到1-甲硅烷基-1,3-二硅氧烷9 -