scholarly journals Syntheses, characterisation, and catalytic role of (η5-C5Me5)Rh(iii) guanidinato complexes in transfer hydrogenation (TH) and TH–etherification

RSC Advances ◽  
2017 ◽  
Vol 7 (54) ◽  
pp. 33890-33904 ◽  
Author(s):  
Robin Kumar ◽  
Natesan Thirupathi
Keyword(s):  
Catalytic Activity ◽  
Carbonyl Compounds ◽  
Transfer Hydrogenation ◽  
Catalytic Role

Complex 3 has been synthesised and its catalytic activity in base assisted and base free transfer hydrogenation (TH) of a variety of carbonyl compounds and TH–etherification of substrates such as 2-hydroxy-1-naphthaldehyde have been achieved.

Kinetic investigation into the chemoselective hydrogenation of α,β-unsaturated carbonyl compounds catalyzed by Ni(0) nanoparticles

2017 ◽  
Vol 46 (15) ◽  
pp. 5082-5090 ◽  
Author(s):  
Laíze Zaramello ◽  
Brunno L. Albuquerque ◽  
Josiel B. Domingos ◽  
Karine Philippot
Keyword(s):  
Catalytic Activity ◽  
Carbonyl Compounds ◽  
Kinetic Investigation ◽  
Olefin Hydrogenation ◽  
Nickel Nanoparticle ◽  
Chemoselective Hydrogenation ◽  
Catalytic Role

Nickel nanoparticle chemoselective hydrogenation catalytic activity revealed: The catalytic role of high active chemoselective magnetic Ni(0) nanocatalysts for olefin hydrogenation of α,β-unsaturated carbonyl compounds was investigated by kinetic means.

scholarly journals Synthesis, spectral characterization and catalytic studies of new ruthenium(II) chalcone thiosemicarbazone complexes

2010 ◽  
Vol 8 (1) ◽  
pp. 229-240 ◽  
Author(s):  
Manisekar Muthukumar ◽  
Periasamy Viswanathamurthi
Keyword(s):  
Catalytic Activity ◽  
Carbonyl Compounds ◽  
Transfer Hydrogenation ◽  
Secondary Alcohols ◽  
Octahedral Structure ◽  
Imine Nitrogen ◽  
Phenolic Oxygen ◽  
Thiosemicarbazone Complexes ◽  
Aldehydes And Ketones ◽  
Nmr Methods

AbstractA series of new hexa-coordinated ruthenium(II) complexes of the type [Ru(CO)(EPh3)(B)(L)] (E = P or As; B = PPh3, AsPh3 or Py; L = chalcone thiosemicarbazone) have been prepared by reacting [RuHCl(CO)(EPh3)2(B)] (E = P or As; B = PPh3, AsPh3 or Py) with chalcone thiosemicarbazones in benzene under reflux. The new complexes have been characterized by analytical and spectroscopic (IR, UV-vis, 1H, 31P and 13C NMR) methods. On the basis of data obtained, an octahedral structure was assigned for all of the complexes. The chalcone thiosemicarbazones behave as dianionic tridentate O, N, S donors and coordinate to ruthenium via the phenolic oxygen of chalcone, the imine nitrogen of thiosemicarbazone and thienol sulfur. The new complexes exhibit catalytic activity for the oxidation of primary and secondary alcohols to their corresponding aldehydes and ketones and they were also found to be efficient catalysts for the transfer hydrogenation of carbonyl compounds.

Catalytic role of graphitic nitrogen atoms in CO oxidation reaction over N-containing graphene: a first-principles mechanistic evaluation

2021 ◽  
Author(s):  
Mehdi D. Esrafili ◽  
Parisasadat Mousavian
Keyword(s):  
Catalytic Activity ◽  
First Principles ◽  
Oxidation Reaction ◽  
Chemical Processes ◽  
Nitrogen Doped ◽  
Co Oxidation Reaction ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Catalytic Role

Nitrogen-doped graphene has sparked a lot of interest due to its exceptional catalytic activity in a variety of chemical processes. We examine the catalytic ability of a series of nitrogen-containing...

Catalytic Activity of Binary and Triple Systems Based on Redox Inactive Metal Compound, LiSt and Additives of Monodentate Ligands-Modifiers: DMF, HMPA and PhOH, in Selective Ethylbenzene Oxidation with Dioxygen

2016 ◽  
Vol 10 (3) ◽  
pp. 259-270
Author(s):  
Ludmila Matienko ◽  
◽  
Larisa Mosolova ◽  
Vladimir Binyukov ◽  
Gennady Zaikov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Triple System ◽  
Metal Compound ◽  
Ethylbenzene Oxidation ◽  
Catalytic Systems ◽  
Triple Systems ◽  
Lithium Compound ◽  
Mechanism Of Catalysis ◽  
Monodentate Ligands

Mechanism of catalysis with binary and triple catalytic systems based on redox inactive metal (lithium) compound {LiSt+L2} and {LiSt+L2+PhOH} (L2=DMF or HMPA), in the selective ethylbenzene oxidation by dioxygen into -phenylethyl hydroperoxide is researched. The results are compared with catalysis by nickel-lithium triple system {NiII(acac)2+LiSt+PhOH} in selective ethylbenzene oxidation to PEH. The role of H-bonding in mechanism of catalysis is discussed. The possibility of the stable supramolecular nanostructures formation on the basis of triple systems, {LiSt+L2+PhOH}, due to intermolecular H-bonds, is researched with the AFM method.

scholarly journals Robust and efficient hydrogenation of carbonyl compounds catalysed by mixed donor Mn(I) pincer complexes

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Wenjun Yang ◽  
Ivan Yu. Chernyshov ◽  
Robin K. A. van Schendel ◽  
Manuela Weber ◽  
Christian Müller ◽  
...  
Keyword(s):  
Noble Metal ◽  
Crucial Role ◽  
Carbonyl Compounds ◽  
Catalytic Performance ◽  
Hydrogen Atmosphere ◽  
Pincer Complexes ◽  
Catalyst Activation ◽  
Hydrogenation Catalysts ◽  
Induction Times

AbstractAny catalyst should be efficient and stable to be implemented in practice. This requirement is particularly valid for manganese hydrogenation catalysts. While representing a more sustainable alternative to conventional noble metal-based systems, manganese hydrogenation catalysts are prone to degrade under catalytic conditions once operation temperatures are high. Herein, we report a highly efficient Mn(I)-CNP pre-catalyst which gives rise to the excellent productivity (TOF° up to 41 000 h−1) and stability (TON up to 200 000) in hydrogenation catalysis. This system enables near-quantitative hydrogenation of ketones, imines, aldehydes and formate esters at the catalyst loadings as low as 5–200 p.p.m. Our analysis points to the crucial role of the catalyst activation step for the catalytic performance and stability of the system. While conventional activation employing alkoxide bases can ultimately provide catalytically competent species under hydrogen atmosphere, activation of Mn(I) pre-catalyst with hydride donor promoters, e.g. KHBEt3, dramatically improves catalytic performance of the system and eliminates induction times associated with slow catalyst activation.

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