Platinumcomplexes [PtCl2(L)] L = L1, L2 with symmetrical HP (OCH2CMe2NH)2 (L1) and unsymmetrical HP(OCMe2CMe2O)(OCH2CMe2NH) (L2) hydrospirophosphorane (HSP) ligands were demonstrated to play a dual role of catalysts and cytotoxic compounds as well. The structure of new complex [PtCl2(L2)] was confirmed by physicochemical and spectroscopic methods, as well as single X-ray diffraction studies for [PtCl2P
adienyl iridium(III) metallacycles catalyse the hydrosilylation of alkynes using triethylsilane and no additive. The reactions proceed rapidly and efficiently at low catalyst loadings and under mild reaction conditions. If catalyses starting from terminalalkynes lead selectively to (Z)-alkenylsilanes in high yields, reactions are less efficient and selective starting from internal alkynes due to steric
(<i>Z</i>)-Selective Hydrosilylation of Terminal Alkynes with HSiMe(OSiMe<sub>3</sub>)<sub>2</sub> Catalyzed by a Ruthenium Complex Containing an N-Heterocyclic Carbene
作者:Yuichiro Mutoh、Yusei Mohara、Shinichi Saito
DOI:10.1021/acs.orglett.7b02477
日期:2017.10.6
The N-heterocyclic-carbene-ligated ruthenium complex [RuHCl(CO)(H2IMes)(PCy3)] exhibits high catalytic activity for the (Z)-selective hydrosilylation of various terminal alkynes with 1,1,1,3,5,5,5-heptamethyltrisiloxane (HSiMe(OSiMe3)2). The stereoretentive derivatization of the (Z)-alkenylsiloxanes allows the synthesis of biologically active compounds, e.g. potent antitumor agents and inhibitors for