Additive-modulated switchable reaction pathway in the addition of alkynes with organosilanes catalyzed by supported Pd nanoparticles: hydrosilylation <i>versus</i> semihydrogenation
作者:Yanan Duan、Guijie Ji、Shaochun Zhang、Xiufang Chen、Yong Yang
DOI:10.1039/c7cy02280h
日期:——
aryl alkynes with various functional groups are compatible with the reaction conditions. The role the additive exerted in each reaction was extensively investigated through control experiments as well as the kinetic isotopic effect along with spectroscopic characterization. In addition, the respective mechanism operating in both reactions was proposed.
A recyclable and reusable K<sub>2</sub>PtCl<sub>4</sub>/Xphos-SO<sub>3</sub>Na/PEG-400/H<sub>2</sub>O system for highly regio- and stereoselective hydrosilylation of terminal alkynes
作者:Caifeng Xu、Bin Huang、Tao Yan、Mingzhong Cai
DOI:10.1039/c7gc02823g
日期:——
K2PtCl4/Xphos-SO3Na in a mixture of poly(ethylene glycol) (PEG-400) and water is shown to be a highly regio- and stereoselective catalyst for the hydrosilylation of terminal alkynes with hydrosilanes. The reaction could be conducted under mild conditions, yielding a variety of functionalized β-(E)-vinylsilanes in good to excellent yields with a total β-(E)-selectivity. The isolation of the products
A Platinum Molecular Complex Immobilised on the Surface of Graphene as Active Catalyst in Alkyne Hydrosilylation
作者:Andres Mollar‐Cuni、Pilar Borja、Santiago Martin、Gregorio Guisado‐Barrios、Jose A. Mata
DOI:10.1002/ejic.202000356
日期:2020.12.7
A platinum complex bearing a N‐heterocycliccarbene (NHC) ligand functionalised with a pyrene‐tag is immobilised onto the surface of reduced graphene oxide (rGO). The hybrid material composed of an organometallic complex and a graphene derivative is ready available in a single‐step process under mild reaction conditions. This methodology preserves the inherent properties of the active catalytic centre
Cooperative Catalytic Alkyne Hydrosilylation by a Porphyrinic Metal–Organic Framework Composite
作者:Chunying Chen、Qijie Mo、Yufei Wang、Li Zhang
DOI:10.1021/acs.inorgchem.3c02479
日期:2023.10.16
valuable building blocks and important structural units in organic chemistry. Herein, catalytic alkyne hydrosilylation was reported to be promoted by a porphyrin metal–organic framework with the incorporation of Pd nanoparticles (Pd@Ir-PCN-222). Catalytic results showed that Pd@Ir-PCN-222 displayed high catalytic efficiency, giving rise to the E isomer vinylsilane with an excellent turnover frequency
乙烯基硅烷是有机化学中有价值的构建单元和重要结构单元。据报道,结合 Pd 纳米颗粒 (Pd@Ir-PCN-222) 的卟啉金属有机框架可促进催化炔烃氢化硅烷化。催化结果表明Pd@Ir-PCN-222表现出高催化效率,产生E异构体乙烯基硅烷,其周转频率(TOF)高达2564 h –1。机理研究表明,催化活性的增强源于铱卟啉与Pd纳米颗粒在有限空间内的协同作用。铱卟啉很容易在Ir-PCN-222的内腔中吸附和缩合氢硅烷和炔烃,不仅加速反应,而且促进Pd纳米粒子激活氢硅烷和炔烃的Si-H和C≡C键, 分别。