N-Heterocyclic carbene rhodium(<scp>i</scp>) complexes containing an axis of chirality: dynamics and catalysis
作者:Maria Cristina Cassani、Marta Anna Brucka、Cristina Femoni、Michele Mancinelli、Andrea Mazzanti、Rita Mazzoni、Gavino Solinas
DOI:10.1039/c3nj01620j
日期:——
Novel rhodium(i) complexes [RhCl(NBD)(NHC)] [NHC = 1-benzyl-3-R-imidazolin-2-ylidene; R = Me, Bz, Tr, tBu]: determination of the rotation barriers about the Rh-carbene and catalytic activity in the hydrosilylation of terminal alkynes.
新型铑(i)配合物 [RhCl(NBD)(NHC)] [NHC = 1-苄基-3-R-咪唑啉-2-基醇; R = 甲基,苯甲酰,三氟甲基,t丁基]:确定Rh-卡宾的旋转阻 barriers 以及在顺烯烃的氢硅烷化反应中的催化活性。
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.
the Si–H bond in silanes for the hydrosilylation of alkynes has been developed. The mild protocol operates efficiently with high regioselectivity (anti-Markovnikov) and stereoselectivity (Z/E ratio ranges from 92:8 to >99:1), providing a wide range of Z-vinylsilanes in high yields. Moreover, visible-light-induced manganese-catalyzed activation of the Ge–H bond for E-selective alkyne hydrogermylation
Carboxylate-Assisted β-(<i>Z</i>) Stereoselective Hydrosilylation of Terminal Alkynes Catalyzed by a Zwitterionic Bis-NHC Rhodium(III) Complex
作者:Raquel Puerta-Oteo、Julen Munarriz、Víctor Polo、M. Victoria Jiménez、Jesús J. Pérez-Torrente
DOI:10.1021/acscatal.0c01582
日期:2020.7.2
catalyst for the hydrosilylation of terminal alkynes with excellent regio- and stereoselectivity toward the less thermodynamically stable β-(Z)-vinylsilane isomer under mild reaction conditions. A broad range of linear 1-alkynes, cycloalkyl acetylenes, and aromatic alkynes undergo the hydrosilylation with HSiMe2Ph to afford the corresponding β-(Z)-vinylsilanes in quantitative yields in short reaction times
Rhodium(I) and iridium(I) imidazo[1,5-a]pyridine-1-ylalkylalkoxy complexes: Synthesis, characterization and application as catalysts for hydrosilylation of alkynes
Rh(I) and Ir(I) complexes bearing imidazo[1,5-a]pyridine-1-ylalkyl alcohol as chelating NˆO-monoanionic ligands were prepared as thermally stable compounds. Their spectroscopic properties and structures were determined based on IR and NMR spectra and X-ray analyses. The Rh(I) complexes were used as catalysts for the hydrosilylation of alkynes. The catalytic activities of the complexes were highly influenced
制备具有咪唑并[1,5 - a ]吡啶-1-基烷基醇作为螯合N = O-单阴离子配体的Rh(I)和Ir(I)配合物,作为热稳定化合物。基于IR和NMR光谱以及X射线分析确定它们的光谱性质和结构。Rh(I)配合物用作炔烃氢化硅烷化的催化剂。配合物的催化活性受到其芳环上取代基的高度影响。在更长的反应时间下,在较高的温度下可以实现乙烯基硅烷的高度E选择性形成。