Ruthenium‐Catalyzed
<i>E</i>
‐Selective Partial Hydrogenation of Alkynes under Transfer‐Hydrogenation Conditions using Paraformaldehyde as Hydrogen Source
作者:Marcus N. A. Fetzer、Ghazal Tavakoli、Axel Klein、Martin H. G. Prechtl
DOI:10.1002/cctc.202001411
日期:2021.3.5
E‐alkenes were synthesized with up to 100 % E/Z selectivity via ruthenium‐catalyzed partial hydrogenation of different aliphatic and aromatic alkynes under transfer‐hydrogenation conditions. Paraformaldehyde as a safe, cheap and easily available solid hydrogen carrier was used for the first time as hydrogen source in the presence of water for transfer‐hydrogenation of alkynes. Optimization reactions showed
The copper-catalyzeddecarboxylative reactions of alkynyl carboxylic acids with aryl halides were performed under relatively mild reaction conditions. Benzofurans could be further prepared smoothly by a one-pot domino protocol on the basis of decarboxylativecross-coupling of 2-iodophenol.
Palladium nanoparticles supported on MOF-5: A highly active catalyst for a ligand- and copper-free Sonogashira coupling reaction
作者:Shuixia Gao、Nan Zhao、Mouhai Shu、Shunai Che
DOI:10.1016/j.apcata.2010.08.045
日期:2010.11
Palladium nanoparticlessupported on MOF-5 (Pd/MOF-5), have been prepared by a chemical method at room temperature. MOF-5 and Pd/MOF-5 were characterized by X-ray diffraction, N2 sorption, thermogravimetric analysis, scanning electron microscopy, and transmission electron microscopy. The catalyst consists of highly dispersed palladium nanoparticles (about 3–6 nm) on MOF-5 with a high surface area (533 m2/g)
Phosphine-free cobalt pincer complex catalyzed <i>Z</i>-selective semi-hydrogenation of unbiased alkynes
作者:Vinod G. Landge、Jayaraman Pitchaimani、Siba P. Midya、Murugan Subaramanian、Vedichi Madhu、Ekambaram Balaraman
DOI:10.1039/c7cy01994g
日期:——
Herein, we report a novel, molecularly defined NNN-type cobalt pincer complexcatalyzed transfer semi-hydrogenation of unbiased alkynes to Z-selective alkenes. This unified process is highly stereo- and chemo-selective and exhibits a broad scope as well as wide functional group tolerance. Ammonia-borane (AB), a bench-stable substrate with high gravimetric hydrogen capacity, was used as a safe and practical