Direct Asymmetric Hydrogenation and Dynamic Kinetic Resolution of Aryl Ketones Catalyzed by an Iridium‐NHC Exhibiting High Enantio‐ and Diastereoselectivity
of ketones in excellent yields and good enantioselectivity (up to 93 % ee). Moreover, when using racemic α‐substituted ketones, excellent diastereoselectivities were obtained (dr 99:1) by dynamic kinetic resolution of the in situ formed enolate. Overall, the herein described hydrogenation occurs under ambient conditions using low hydrogen pressures, providing a direct and atom efficient method towards
Abstract Raney Ni‐Al alloy in a dilute alkaline aqueous solution has been shown to be a powerful reducing agent, which is highly effective in the reduction of benzophenones to the corresponding hydrocarbon derivatives, in the absence of any organic solvents.
Cobalt-Nanoparticles Catalyzed Efficient and Selective Hydrogenation of Aromatic Hydrocarbons
作者:Kathiravan Murugesan、Thirusangumurugan Senthamarai、Ahmad S. Alshammari、Rashid M. Altamimi、Carsten Kreyenschulte、Marga-Martina Pohl、Henrik Lund、Rajenahally V. Jagadeesh、Matthias Beller
DOI:10.1021/acscatal.9b02193
日期:2019.9.6
catalysts for such reactions. The specific nanoparticles were prepared by assembling cobalt-pyromellitic acid-piperazine coordination polymer on commercial silica and subsequent pyrolysis. Applying the optimal nanocatalyst, industrial bulk, substituted, and functionalized arenes as well as polycyclic aromatic hydrocarbons are selectively hydrogenated to obtain cyclohexane-based compounds under industrially
Piano‐stool Ru (II) arene complexes that contain ethylenediamine and application in alpha‐alkylation reaction of ketones with alcohols
作者:Serdar Batıkan Kavukcu、Salih Günnaz、Onur Şahin、Hayati Türkmen
DOI:10.1002/aoc.4888
日期:2019.5
borrowing hydrogen strategy in mild reaction conditions within a short time. The catalytic system has a broad substrate scope, which allows the synthesis of alpha alkylated ketones with excellent yields. The electronic and steric effects of complexes on catalytic activity were analysed. The influence of the carbon chain length of the ligand on the alpha‐alkylation reaction of ketones was also investigated
Tuning the Product Selectivity of the α-Alkylation of Ketones with Primary Alcohols using Oxidized Titanium Nitride Photocatalysts and Visible Light
作者:Peifeng Li、Gang Xiao、Yilin Zhao、Haijia Su
DOI:10.1021/acscatal.9b04921
日期:2020.3.20
α-alkylated ketones and enones is an attractive procedure for C–C bondformation. High reaction temperatures are always needed for heterogeneous catalysisusing non-noble metals, and switching product selectivity in one catalysis system remains a great challenge. In the present study, a visible-light-driven procedure for this reaction is proposed, using oxidized TiN photocatalysts under mild conditions, whereby