Etude de 8 especes isotopiques du trithiolanne-1,2,4(类似硫磺de l'ozonide d'ethylene)。La structure estdetermine par ajustement des moindres carres des moment d'inertie。讨论
trihydrosilanes was achieved in a highly selective fashion assisted by continuous-flow micro-tubing reactors. The ability to access silyl radicals using photocatalytic Si-H activation promoted by eosin Y offers new perspectives for the synthesis of valuable silicon reagents in a convenient and green manner.
Reactivity of a Titanocene Pendant Si–H Group toward Alcohols. Unexpected Formation of Siloxanes from the Reaction of Hydrosilanes and Ph<sub>3</sub>COH Catalyzed by B(C<sub>6</sub>F<sub>5</sub>)<sub>3</sub>
hydrosilane. The different hydrosilane reactivity toward Ph3COH in comparison with other alcohols can be attributed to the easy generation of the borate salt [Ph3C]+[(C6F5)3B(μ-OH)B(C6F5)3]− (5) under catalytic conditions. The intramolecular Si–H and Ti–Cl exchange in 1 is catalyzed by B(C6F5)3 in the presence of no alcohol. This process affords presumably a transient titanocene hydrido chloride, which
Kinetic and Theoretical Study of the Hydrodechlorination of CH<sub>4−<i>x</i></sub>Cl<sub><i>x</i></sub> (<i>x</i> = 1−4) Compounds on Palladium
作者:Nan Chen、Robert M. Rioux、Luis A. M. M. Barbosa、Fabio H. Ribeiro
DOI:10.1021/la1020753
日期:2010.11.2
reaction mechanism. Kinetic and isotope exchange experiments demonstrated the following: gas phase H2 and HCl are in equilibrium with surface H and Cl; adsorbed Cl is the most abundant surface intermediate; and irreversible scission of the first C−Cl bond is rate-determining. The overall hydrodechlorination reaction rate can be written as kKR−Cl[R−Cl]/(1 + KHCl[HCl]/KH21/2[H2]1/2). The activation energy
在Pd /碳催化剂上测量了一系列CH 4− x Cl x(x = 1-4)化合物的加氢脱氯(HDCl)反应动力学。HDCl的速率与C-Cl键的能量相关,这表明该键在分子吸附分子中的断裂决定了速率。CH 4- x Cl x化合物的测定反应动力学支持先前提出的Langmuir-Hinshelwood型反应机理。动力学和同位素交换实验表明:气相H 2HCl与表面H和Cl平衡;吸附的Cl是最丰富的表面中间体;而第一个C-Cl键的不可逆断裂是决定速率的。总加氢脱氯反应速率可以写为kK R-Cl [R-Cl] /(1 + K HCl [HCl] / K H 2 1/2 [H 2 ] 1/2)。速率确定步骤的活化能与以布朗斯台德-埃文斯-波兰尼关系破裂的第一个C-Cl键的离解能成线性关系。该行为与先前对CF 3 CF 3- x Cl x化合物的研究一致。CH反应期间3 Cl,CH 2 Cl 2和CHCl
Kinetics of reactions of CN with chlorinated methanes
作者:Vaishali Samant、John F. Hershberger
DOI:10.1016/j.cplett.2008.06.014
日期:2008.7
The kinetics of reactions of CN with the chlorinated methanes CH3Cl, CH2Cl2, CHCl3 and CCl4 were investigated over the temperature range 298–573 K, using laser induced fluorescence (LIF) spectroscopy. At 298 K, rate constants of 9.0 ± 0.3 × 10−13, 8.8 ± 0.4 × 10−13, 9.0 ± 0.5 × 10−13 and 4.3 ± 0.6 × 10−13 cm3 molecule−1 s−1 were measured, respectively. A small positive temperature dependence was observed
使用激光诱导荧光(LIF)光谱研究了CN与氯化甲烷CH 3 Cl,CH 2 Cl 2,CHCl 3和CCl 4的反应动力学,在298–573 K的温度范围内。在298K,9.0±0.3×10速率常数-13,8.8±0.4×10 -13,9.0±0.5×10 -13和4.3±0.6×10 -13 厘米3 分子-1 小号-1进行测定,分别。观察到较小的正温度依赖性,以及k H / k D的动力学同位素效应 〜2.14–2.25。这些数据以及产物检测实验强烈表明,氢的提取在这些反应中占主导地位。
[Cl@Si<sub>20</sub>H<sub>20</sub>]<sup>−</sup>: Parent Siladodecahedrane with Endohedral Chloride Ion
monodisperse silicon analogues are scarce. Herein, we report the synthesis of the parent siladodecahedrane, which represents the largest Platonic solid. It shares its pattern of pentagonal faces with the smallest fullerene, C20, and its saturated, H-terminated skeleton with diamondoids. Similar to endofullerenes, the silicon cage encapsulates a chlorideion ([Cl@Si20H20]−); similar to diamondoids, its Si–H termini
富勒烯和类金刚石是纳米科学的核心。可比较的单分散硅类似物很少。在此,我们报告了代表最大柏拉图固体的母体硅十二面体的合成。它与最小的富勒烯 C 20共享其五边形面的图案,以及其饱和的 H 端骨架与类金刚石。与内富勒烯类似,硅笼封装了一个氯离子([Cl@Si 20 H 20 ] -);与类金刚石类似,其 Si-H 末端为进一步功能化提供了大量机会。仅用氯甲烷处理会导致全氯化簇 [Cl@Si 20 Cl 20 ] -. 两种化合物均通过质谱、X 射线晶体学、核磁共振光谱和量子化学计算进行表征。正如我们通过高级计算分析所证明的那样,实验确定的内嵌氯离子的35 Cl 共振对于探测 Cl - → Si 20相互作用强度作为不同表面取代基的函数特别具有诊断意义。