(Trialkylstannyl)dimethylsilane as a new precursor of dimethylsilylene: a novel synthesis of 3,4-disubstituted 1-silacyclopenta-2,4-dienes
摘要:
In the presence of triphenylphosphinepalladium complexes, (trialkylstannyl)dimethylsilane rapidly reacted at room temperature with terminal acetylenes to give 3,4-disubstituted 1-silacyclopenta-2,4-dienes in moderate yield. The formation of 1-silacyclopentadiene derivatives is evidence for the generation of dimethylsilylene species from (trialkylstannyl)dimethylsilane.
Reactivity of the Base-Stabilized Bis(silylene)iron Complex (η<sup>5</sup>-C<sub>5</sub>H<sub>5</sub>)Fe(CO)(η<sup>2</sup>-SiMe<sub>2</sub>-O<i><sup>t</sup></i>Bu-SiMe<sub>2</sub>): Elevated Temperature Trapping of SiMe<sub>2</sub> by R<sub>3</sub>EH (R = Me<sub>3</sub>Si, E = Si, Ge) and Elimination of Me<sub>2</sub>(O<sup>t</sup>Bu)SiSiMe<sub>2</sub>H by <i>n</i>-Bu<sub>3</sub>SnH
作者:Hemant K. Sharma、Keith H. Pannell
DOI:10.1021/om000563j
日期:2001.1.1
The base-stabilized silylene complex (eta (5)-C5H5)Fe(CO)(eta (2)-SiMe2-(OBu)-Bu-t-SiMe2) is unreactive toward (Me3Si)(3)EH (E = Si, Ge) under photochemical irradiation or at room temperature. However, at 80 degreesC it reacts, presumably via the equilibrium concentration of base-free complex (eta (5)-C5H5)Fe(CO)((SiMe2OBu)-Bu-t)(=SiMe2), to transfer the silylene group and form (Me3Si)(3)ESiMe2H. Attempts to transfer the SiMe2 group to tributyltin hydride led to formation of bis(tributylstannyl)iron completes.
Die chemie der schweren carben-analogen R2M, M = Si, Ge, Sn
作者:Hubertus Appler、Wilhelm P. Neumann
DOI:10.1016/0022-328x(86)80389-8
日期:1986.10
The 7-sila norbornadienes (I–IV) react rapidly with halogens at −20 to +20°C to yield Me2SiHal2 (Hal = Cl, Br, I) and the naphthalene or benzene derivatives (V–VIII). Bromine in CCl4 at 0°C, however, caused surprising rearrangement in I giving the 2-bromosilylated naphthalene (IX), since an attack at the alkene group seemed to be preferred. Methylation and methoxylation of IX gave respectively X and
7-sila降冰片二烯(I–IV)在-20至+ 20°C下与卤素迅速反应,生成Me 2 SiHal 2(Hal = Cl,Br,I)和萘或苯衍生物(V–VIII)。然而,在0°C的CCl 4中,溴导致I产生令人惊讶的重排,生成2-溴硅烷化的萘(IX),因为似乎最好攻击烯烃基团。IX的甲基化和甲氧基化分别得到X和XI。IX的仔细水解产生了二硅氧烷VII。在160–200°C时未观察到将Me 2 Si插入SiHal,SiH,SiC或SnC键中,而通过一个单键平稳地插入了SnCl或SnH键中。步机制。卤素是从产生Me 2 SiHal的不同CHal键中提取的2有时是我4 Si 2 Hal 2。在这些情况下,亚甲硅烷基前体的降解始终是一阶的,并且类似于自发热解的降解。
(Trialkylstannyl)dimethylsilane as a new precursor of dimethylsilylene: a novel synthesis of 3,4-disubstituted 1-silacyclopenta-2,4-dienes
In the presence of triphenylphosphinepalladium complexes, (trialkylstannyl)dimethylsilane rapidly reacted at room temperature with terminal acetylenes to give 3,4-disubstituted 1-silacyclopenta-2,4-dienes in moderate yield. The formation of 1-silacyclopentadiene derivatives is evidence for the generation of dimethylsilylene species from (trialkylstannyl)dimethylsilane.