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。
Facile syntheses, structural characterizations, and isomerization of disiloxane-1,3-diols
作者:Hyeon Mo Cho、Sea Ho Jeon、Han Kuk Lee、Jung Hoon Kim、Sangwoo Park、Moon-Gun Choi、Myong Euy Lee
DOI:10.1016/j.jorganchem.2003.10.030
日期:2004.1
analyses of meso-2, rac-2a, rac-2b and 3 are reported. They showed strong intramolecular hydrogen bondings between the hydroxy group and the nitrogen atom. We have also found that the diastereomeric isomerization of meso-2 to rac-2 in CDCl3 solvent containing moisture occurred to result in the 55:45 equilibrium mixtures of the isomers and vice versa.
在具有分子内配位原子二氯硅烷的水解反应,dcisiloxane -1,3-二醇,[(OH) ø - (CH 3)2 NCH 2 -C 6 H ^ 4 }为RSi] 2 O(R = CH 2 CH(1),C 6 H 5(2),o-(CH 3)2 NCH 2 C 6 H 4(3),Me(4))以高收率获得。meso - 2的晶体结构分析结果,外消旋-图2a,外消旋- 2B和3中报告。它们在羟基和氮原子之间显示出很强的分子内氢键。我们还发现,非对映异构的内消旋- 2到外消旋- 2在CDCl 3发生含溶剂的水分导致的异构体和反之亦然的55:45平衡混合物。
Chalcogen Transfer to Bis[2‐(dimethylaminomethyl)phenyl]silanediyl by Isocyanates and Isothiocyanates
作者:Johannes Belzner、Heiko Ihmels、Boris O. Kneisel、Regine Herbst‐Irmer
DOI:10.1002/cber.19961290203
日期:1996.2
hexakis[2-(dimethylaminomethyl)phenyl]cyclo-trisilane (1) with isocyanates results in the clean formation of cyclic di- or trisiloxanes 3 and 4a and the corresponding isonitrile. Single-crystal X-ray analysis of tetrakis[2-(dimethylaminomethyl)phenyl]cyclodisiloxane (4a) reveals each silicon center to interact with two amino groups forming Si ⃛N distances, which differ significantly in length. Phenyl isothio-cyanate