Herein, the photocatalytic hydrosilylation of alkynes and alkenes under continuousflow conditions is described. By using 0.2 mol % of the developed [Cu(dmp)(XantphosTEPD)]PF6 under blue LEDs irradiation, a large panel of alkenes and alkynes was hydrosilylated in good to excellent yields with a large functional group tolerance. The mechanism of the reaction was studied, and a plausible scenario was
在此,描述了在连续流动条件下炔烃和烯烃的光催化氢化硅烷化。通过在蓝光 LED 照射下使用 0.2 mol% 开发的 [Cu(dmp)(XantphosTEPD)]PF 6,大量烯烃和炔烃被氢化硅烷化,产率良好至极好,具有较大的官能团耐受性。研究了反应的机理,并提出了一个可能的假设。
Iridium(<scp>i</scp>) complexes bearing hemilabile coumarin-functionalised N-heterocyclic carbene ligands with application as alkyne hydrosilylation catalysts
作者:Mert Olgun Karataş、Bülent Alıcı、Vincenzo Passarelli、Ismail Özdemir、Jesús J. Pérez-Torrente、Ricardo Castarlenas
DOI:10.1039/d1dt01946e
日期:——
A set of iridium(I) complexes of formula IrCl(κC,η2-IRCouR′)(cod) or IrCl(κC, η2-BzIRCouR′)(cod) (cod = 1,5-cyclooctadiene; Cou = coumarin; I = imidazolin-2-carbene; BzI = benzimidazolin-2-carbene) have beeen prepared from the corresponding azolium salt and [Ir(μ-OMe)(cod)]2 in THF at room temperature. The crystalline structures of 4b and 5b show a distorted trigonal bipyramidal configuration in the
一组铱(我)式的IrCl的复合物(κ Ç,η 2 -I - [R凑R' )(COD)或的IrCl(κ Ç,η 2 -BzI ř凑R' )(COD)(COD = 1, 5-环辛二烯;Cou = 香豆素;I = 咪唑啉-2-卡宾;BzI = 苯并咪唑啉-2-卡宾)在室温下由相应的唑鎓盐和 [Ir(μ-OMe)(cod)] 2在 THF 中制备. 4b和5b的晶体结构显示了在固态下具有协调的香豆素部分的扭曲三角双锥构型。相比之下,由于吡喃酮环的半化能力,在溶液中观察到该五配位结构与相关方形平面异构体之间的平衡。分别在低温和高温极限下实现了两种物质的 NMR 表征。此外,平衡的热力学参数 Δ H R和 Δ S R是通过 VT 1 H NMR 光谱获得的,并且落在 22-33 kJ mol -1和 72-113 J mol -1 K -1 的范围内,分别。IrCl(κ C ,η 2-BzI Tol
Highly selective hydrosilylation of olefins and acetylenes by platinum(0) complexes bearing bulky N-heterocyclic carbene ligands
作者:P. Żak、M. Bołt、M. Kubicki、C. Pietraszuk
DOI:10.1039/c7dt04392a
日期:——
Platinum complexes bearing bulky N-heterocycliccarbene (NHC) ligands, i.e., [Pt(IPr*)(dvtms)] (where, IPr* = 1,3-bis2,6-bis(diphenylmethyl)-4-methylphenyl}imidazol-2-ylidene) and [Pt(IPr*OMe)(dvtms)] (where, IPr*OMe = 1,3-bis2,6-bis(diphenylmethyl)-4-methoxyphenyl}imidazol-2-ylidene, dvtms = divinyltetramethyldisiloxane) catalyse nearly quantitatively and highly or completely the selective hydrosilylation
Manganese-Catalyzed Dehydrogenative Silylation of Alkenes Following Two Parallel Inner-Sphere Pathways
作者:Stefan Weber、Manuel Glavic、Berthold Stöger、Ernst Pittenauer、Maren Podewitz、Luis F. Veiros、Karl Kirchner
DOI:10.1021/jacs.1c09175
日期:2021.10.27
of aromatic and aliphaticalkenes was efficiently and selectively converted into E-vinylsilanes and allylsilanes, respectively, at room temperature. Mechanistic insights are provided based on experimental data and DFT calculations revealing that two parallel reaction pathways are operative: an acceptorless reaction pathway involving dihydrogen release and a pathway requiring an alkene as sacrificial
Rh(I)/(III)‐N‐Heterocyclic Carbene Complexes: Effect of Steric Confinement Upon Immobilization on Regio‐ and Stereoselectivity in the Hydrosilylation of Alkynes
作者:Pradeep K. R. Panyam、Boshra Atwi、Felix Ziegler、Wolfgang Frey、Michal Nowakowski、Matthias Bauer、Michael R. Buchmeiser
DOI:10.1002/chem.202103099
日期:2021.12.6
Novel Rh(III) pentamethylcyclopentadienyl and Rh(I) complexes containing chelating N-heterocycliccarbenes have been prepared and used in the hydrosilylation of 1-alkynes. Selected catalysts were immobilized within the mesopores of SBA-15. The confinement effects either provided by the ligands or the mesoporous support have been studied and allow for hydrosilylation with β(Z)-selectivity of up to 100 %