Lanthanum Ate Amide-Catalyzed Regio- and Stereoselective Hydrosilylation of Internal Alkynes
作者:Xiaoming Xu、Ailin Gao、Wufeng Chen、Xiufang Xu、Jianfeng Li、Chunming Cui
DOI:10.1021/acscatal.2c06100
日期:2023.3.17
synthetic intermediates to substituted alkenes and silicon materials and can be directly obtained by the catalytic selective hydrosilylation of alkynes. In this Letter, the catalytic selective α-syn-hydrosilylation of both aryl- and silyl-substituted internal alkynes is described with an ene-diamido rare-earth ate complex as a catalyst. The reaction resulted in the selective formation of trisubstituted silylalkenes
硅烷烯烃是取代烯烃和硅材料的重要合成中间体,可通过炔烃的催化选择性氢化硅烷化反应直接获得。在这封信中,描述了用烯-二氨基稀土酸盐络合物作为催化剂的芳基和甲硅烷基取代的内部炔烃的催化选择性 α-顺式-氢化硅烷化。该反应导致选择性形成三取代的甲硅烷基烯烃,包括孪生二甲硅烷基烯烃。动力学研究和 DFT 计算揭示了镧催化剂的 ate 结构对高反应活性的关键作用。
Cyclopentadienone and Hydroxycyclopentadienyl Cobalt Complexes from the Reaction of an Alkynylphenylsilane with Co<sub>2</sub>(CO)<sub>8</sub>
作者:Florian Hoffmann、Jörg Wagler、Gerhard Roewer
DOI:10.1021/om500488w
日期:2014.10.27
Reaction of dimethyl(pent-1-yn-1-yl)phenylsilane n-PrC CSiMe2Ph (1) with Co-2(CO)(8) in n-heptane or 1,4-dioxane led to the formation of cobalt complexes with carboncarbon bond coupling and insertion of a carbonyl ligand ([2 + 2 + 1] cycloaddition). In both solvents, the compounds (n-PrC CSiMe2Ph)center dot Co-2(CO)(6) (2), [n-Pr-2(PhMe2Si)(2)C4C=O]Co(CO)(2)}(2) (3), and [n-Pr-2(PhMe2Si)(2)C5OH]Co-(CO)(2) (4) were obtained. In n-heptane, a fourth cobalt complex (5) was isolated as well but could not be identified, while in 1,4-dioxane, metallic cobalt formed instead. The yields of 3 and 4 in 1,4-dioxane were distinctly higher than those in n-heptane (11 and 21% vs 7.5 and 6%). All compounds were characterized by spectroscopic methods (NMR, IR, UV/vis), and the molecular structures of 3 and 4 were determined.