Synthese und ungewöhnliche Reaktivität eines Cyclotrisilans
作者:Johannes Belzner
DOI:10.1016/0022-328x(92)83274-l
日期:1992.6
Reductive coupling of dichlorosilane 1 with magnesium yields the stable, highly moisture sensitive cyclotrisilane 2a. The hydrolysis products, 1,3-siloxanediol 3 and disilane 4 corroborate the proposed structure of 2a. The reaction with typical silylene trapping agents like benzyl, benzophenone or 2,2′-bipyridyl results in cleavage of all three endocyclic bonds of 2a, yielding the formal silylene addition
Synthesis of 6-, 7- and 8-membered cyclosiloxanes having multifunctional groups
作者:Hyeon Mo Cho、Ji-Eun Lee、Myong Euy Lee、Kang Mun Lee
DOI:10.1016/j.jorganchem.2011.04.025
日期:2011.7
Cyclosiloxanes having intramolecular donor atoms, a Si–Si bond, and vinyl groups were synthesized as useful precursors for ring-opening polymerization. 1,1,3,3-Tetrakis(dimethylaminomethylphenyl)-5,5-dimethylcyclotrisiloxane was also synthesized and characterized by single crystal X-ray structural analysis, which shows strong coordination from N to Si in the solid state.
The Lewis acid B(C6F5)3 and the cyclic silane (ArN2Si)3 (1) (ArN=o‐(CH3)2NCH2C6H4) are useful precursors to access the silylene(II)–borane adduct ArN2Si‐B(C6F5)3 (2). Treatment of 2 with water led to coordination and gave the Lewispair (ArN2H2O)Si‐B(C6F5)3 (3) that exhibits a hydrogen‐bond‐stabilized silanol unit. It can be converted into the siloxane [(HArN)2SiOB(C6F5)3]2O (6) by dehydrogenation in
路易斯酸B(C 6 F 5)3和环状硅烷(Ar N 2 Si)3(1)(Ar N = o-(CH 3)2 NCH 2 C 6 H 4)是接触亚甲硅烷基的有用前体(II)-硼烷加合物Ar N 2 Si-B(C 6 F 5)3(2)。用水处理2导致配位并产生Lewis对(Ar N 2 H 2 O)Si-B(C6 F 5)3(3)具有氢键稳定的硅烷醇单元。通过在碱的存在下进行脱氢,可以将其转化为硅氧烷[(HAr N)2 SiOB(C 6 F 5)3 ] 2 O(6)。表征化合物的异核NMR光谱数据得到了量子化学计算的支持。