Reactions of trisilaallene and 2-germadisilaallene with various reagents
摘要:
A number of the distinctive reactions of trisilaallene 1 and 2-germadisilaallene 4 with various reagents including water, alcohols, acetone, and haloalkanes were studied. The addition reactions of 1 to water and alcohols occur in a regiospecific manner to afford 1,3-dioxytrisilanes in high yields. The additions are explained by a stepwise mechanism involving the initial nucleophilic attack of a hydroxy oxygen to a terminal allenic silicon to give an intermediate unsymmetric disilene. The regiospecificity is rationalized by the shape of the frontier molecular orbitals and the NPA charge distribution of trisilaallene 1 and the intermediate disilene. (c) 2006 Elsevier B.V. All rights reserved.
丙二烯(重丙二烯)[R(2)M=M'=MR(2); 重14族元素同系物之间的合成、X射线和光谱分析以及不寻常的键合和结构;M = M' = Si (1a), M = Si, M' = Ge (1b), M = Ge, M' = Si (1c), and M = M' = Ge (1d)] 进行了比较讨论。使用 DFT 计算和 PMO 理论,重丙二烯的弯曲和流动骨架的起源归因于与有效 pi-sigma* 混合(pi-sigma* 失真)相关的 Jahn-Teller 失真。这种类型的扭曲被认为是定性描述重主族元素的不饱和化合物的不寻常键合的关键概念。
A missing allene of heavy Group 14 elements: 2-germadisilaallene
作者:Takeaki Iwamoto、Takashi Abe、Chizuko Kabuto、Mitsuo Kira
DOI:10.1039/b509878e
日期:——
The first stable 2-germadisilaallene was synthesized by the reduction of a 2 ∶ 1 mixture of a stable dialkylsilylene and dichlorogermylene–dioxane complex with KC8; the 2-germadisilaallene showed dynamic disorder similar to the corresponding trisilaallene in the solid state.
Reactions of trisilaallene and 2-germadisilaallene with various reagents
作者:Takeaki Iwamoto、Takashi Abe、Shintaro Ishida、Chizuko Kabuto、Mitsuo Kira
DOI:10.1016/j.jorganchem.2006.05.063
日期:2007.1
A number of the distinctive reactions of trisilaallene 1 and 2-germadisilaallene 4 with various reagents including water, alcohols, acetone, and haloalkanes were studied. The addition reactions of 1 to water and alcohols occur in a regiospecific manner to afford 1,3-dioxytrisilanes in high yields. The additions are explained by a stepwise mechanism involving the initial nucleophilic attack of a hydroxy oxygen to a terminal allenic silicon to give an intermediate unsymmetric disilene. The regiospecificity is rationalized by the shape of the frontier molecular orbitals and the NPA charge distribution of trisilaallene 1 and the intermediate disilene. (c) 2006 Elsevier B.V. All rights reserved.
Unusual Bonding in Trisilaallene and Related Heavy Allenes
element congeners of allene (heavy allenes) [R(2)M=M'=MR(2); M = M' = Si (1a), M = Si, M' = Ge (1b), M = Ge, M' = Si (1c), and M = M' = Ge (1d)] are comparatively discussed. Using DFT calculations and PMO theory, the origin of the bent and fluxional skeleton of the heavy allenes is ascribed to the Jahn-Tellerdistortion associated with the effective pi-sigma* mixing (pi-sigma* distortion). This type of distortion
丙二烯(重丙二烯)[R(2)M=M'=MR(2); 重14族元素同系物之间的合成、X射线和光谱分析以及不寻常的键合和结构;M = M' = Si (1a), M = Si, M' = Ge (1b), M = Ge, M' = Si (1c), and M = M' = Ge (1d)] 进行了比较讨论。使用 DFT 计算和 PMO 理论,重丙二烯的弯曲和流动骨架的起源归因于与有效 pi-sigma* 混合(pi-sigma* 失真)相关的 Jahn-Teller 失真。这种类型的扭曲被认为是定性描述重主族元素的不饱和化合物的不寻常键合的关键概念。