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。
Preparation of metallated and substituted alkynes
申请人:Air Products and Chemicals, Inc.
公开号:US05062998A1
公开(公告)日:1991-11-05
A process is provided for making metallated and substituted alkynes from feedstocks which include alkadienes containing allenic unsaturation or such alkadienes in a mixture with alkynes having either internal or terminal unsaturation, such as a mixture of propadiene and propyne. This reaction involves an initial step in which the allenic hydrocarbon and any internal alkyne is isomerized and simultaneously the resultant terminal alkynes are metallated with an alkali metal. The reaction is carried out at relatively low temperatures in a suitable inert solvent such as diethylether. When metallation is complete the reaction mixture can be contacted directly with any suitable electrophile, such as a halo silane, for example, chlorotrimethylsilane, and the alkali metal on the terminal alkyne is replaced with the desired substituent. The products thus formed are useful as monomers for preparing polymers having a variety of properties, for example, as asymmetric membranes for gas separation.
Ruthenium-Catalyzed Intermolecular Coupling of Vinylic 1,2-Bisboronates with Alkynes: Stereoselective Access to Boryl-Substituted Homoallylic Alcohols
作者:Barry M. Trost、Guoting Zhang
DOI:10.1021/jacs.0c01755
日期:2020.4.22
The ruthenium catalytic addition of alkenes to alkynes has been demonstrated as a powerful synthetic tool to form diene motifs and widely applied in the synthesis of complex molecules. How-ever, except for the intramolecular coupling, trisubstituted alkenes are unsatisfactory coupling partners with alkynes, presumably due to the increased steric hindrance. Herein, we discovered that the substituted