Unusually Large Tunneling Effect on Highly Efficient Generation of Hydrogen and Hydrogen Isotopes in pH-Selective Decomposition of Formic Acid Catalyzed by a Heterodinuclear Iridium−Ruthenium Complex in Water
摘要:
A heterodinuclear iridium-ruthenium complex [Ir(III)(Cp*)(H(2)O)(bpm)Ru(II)(bpy)(2)](SO(4))(2) {1(SO(4))(2), Cp* = eta(5)-pentamethylcyclopentadienyl, bpm = 2,2'-bipyrimidine, bpy = 2,2'-bipyridine} acts as the most effective catalyst for selective production of hydrogen from formic acid in an aqueous solution at ambient temperature among catalysts reported so far. An unusually large tunneling effect was observed for the first time for the catalytic hydrogen production in H(2)O vs D(2)O.
Pd-Catalyzed Reduction of Aldehydes to Alcohols Using Formic Acid as the Hydrogen Donor
摘要:
Facile and selective reduction of aromatic aldehydes as well as aliphatic aldehydes to alcohols was achieved using formic acid as the hydrogen donor in the presence of a catalytic amount of Pd(OAc)(2) and Cy3P. It was found that both hydrogen atoms in the formic acid molecule can serve as the hydride source. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource(s): Full experimental and spectral details.]
Moleculariridium catalysts immobilized in metal-organic frameworks (MOFs) were positioned in the condensing chamber of a Soxhlet extractor for efficient CO2 hydrogenation. Droplets of hot water seeped through the MOF catalyst to create dynamic gas/liquid interfaces which maximize the contact of CO2, H2, H2O, and the catalyst to achieve a high turnover frequency of 410 h-1 under atmospheric pressure
A General, Activator-Free Palladium-Catalyzed Synthesis of Arylacetic and Benzoic Acids from Formic Acid
作者:Lin Wang、Helfried Neumann、Matthias Beller
DOI:10.1002/anie.201802384
日期:2018.6.4
carboxylative synthesis of arylacetic and benzoic acids using formic acid (HCOOH) as the CO surrogate was developed. In an improvement over previous work, CO is generated in situ without the need for any additional activators. Key to success was the use of a specific system consisting of palladium acetate and 1,2‐bis((tert‐butyl(2‐pyridinyl)phosphinyl)methyl)benzene. The generality of this method is demonstrated
carbonylation reactions. However, there are no catalytic synthetic procedures for their preparation. In this manuscript, we developed a convenient palladium‐catalyzed procedure for the synthesis of aryl formates. Good yields were achieved undermild reaction conditions with formic acid as the formyl source.
Facile Synthesis and Versatile Reactivity of an Unusual Cyclometalated Rhodium(I) Pincer Complex
作者:Linda S. Jongbloed、Bas de Bruin、Joost N. H. Reek、Martin Lutz、Jarl Ivar van der Vlugt
DOI:10.1002/chem.201406463
日期:2015.5.4
The synthesis of the reactive PN(CH) ligand 2‐di(tert‐butylphosphanomethyl)‐6‐phenylpyridine (1H) and its versatile coordination to a RhI center is described. Facile CHactivation occurs in the presence of a (internal) base, thus resulting in the new cyclometalated complex [RhI(CO)(κ3‐P,N,C‐1)] (3), which has been structurally characterized. The resulting tridentate ligand framework was experimentally
Highly dispersed PdCualloynanoparticles have been successfully prepared within a macroreticularbasicresin bearing N(CH3)2 functional groups. This previously unappreciated combination of alloy is first proven to be responsible for the efficient production of high‐purity H2 fromformicacid (HCOOH) dehydrogenation for chemical hydrogen storage. By the addition of Cu, the electronically promoted