Rhodium-Catalyzed Alkenylation of Nitriles via Silicon-Assisted C−CN Bond Cleavage
摘要:
Rhodium-catalyzed Mizoroki-Heck type reaction of nitriles via the cleavage of C-C bonds is described. Orthogonal and iterative functionalizations of arenes were also demonstrated by combining the present and conventional halide-based cross-coupling reactions.
Metal-Free Catalytic Reductive Cleavage of Enol Ethers
作者:Karina Chulsky、Roman Dobrovetsky
DOI:10.1021/acs.orglett.8b02932
日期:2018.11.2
In contrast to the well-known reductivecleavage of the alkyl–O bond, the cleavage of the alkenyl–O bond is much more challenging especially using metal-free approaches. Unexpectedly, alkenyl–O bonds were reductively cleaved when enol ethers were reacted with Et3SiH and a catalytic amount of B(C6F5)3. Supposedly, this reaction is the result of a B(C6F5)3-catalyzed tandem hydrosilylation reaction and
与众所周知的烷基-O键的还原裂解相反,烯基-O键的裂解更具挑战性,尤其是使用无金属方法时。出乎意料的是,当烯醇醚与Et 3 SiH和催化量的B(C 6 F 5)3反应时,烯基-O键被还原性裂解。据推测,该反应是B(C 6 F 5)3催化的串联氢化硅烷化反应和硅辅助的β-消除的结果。基于实验和密度泛函理论(DFT)计算,提出了这种裂解反应的机理。
Water-Soluble N-Heterocyclic Carbene Platinum(0) Complexes: Recyclable Catalysts for the Hydrosilylation of Alkynes in Water at Room Temperature
作者:Gustavo F. Silbestri、Juan Carlos Flores、Ernesto de Jesús
DOI:10.1021/om300148q
日期:2012.4.23
The synthesis and characterization of new water-soluble platinum(0) complexes bearing sulfonated N-heterocyclic carbene (NHC) and divinyltetramethylsiloxane (dvtms) ligands are described. These complexes, of the general formula (NHC)Pt(dvtms), are active and recyclable catalysts for the hydrosilylation of phenylacetylene and other alkynes at room temperature in water. Our findings indicate that the
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 highly regio- and stereoselective transition metal-catalyzed hydrosilylation of terminal alkynes under ambient conditions of air, water, and room temperature
作者:Wei Wu、Chao-Jun Li
DOI:10.1039/b302259e
日期:——
A highly efficient and stereoselectivehydrosilylation of terminalalkynes was developed at room temperature in air and water.
在室温下在空气和水中开发了末端炔烃的高效和立体选择性氢化硅烷化。
Carbon supported hybrid catalysts for controlled product selectivity in the hydrosilylation of alkynes
作者:Max Roemer、Vinicius R. Gonçales、Sinead T. Keaveney、Indrek Pernik、Jiaxin Lian、James Downes、J. Justin Gooding、Barbara A. Messerle
DOI:10.1039/d0cy02136a
日期:——
A series of Rh- and Ir-hybrid catalysts with varying tether lengths has been prepared by immobilization of RhI, RhIII and IrIII complexes on carbon black via radical grafting. The performance of the different catalysts was assessed for the hydrosilylation of phenylacetylene with Et3SiH. The efficiency of the catalysts was dependent on the length of the tethers to the surface. The RhIII- and IrIII hybrids