NiO–Ni/graphitic carbon nitride as a selective catalyst for transfer hydrogenation of carbonyl compounds using NaH2PO2 as a hydrogen source DOI
Ashish Bahuguna, Sourav Chakraborty, Yoel Sasson

et al.

International Journal of Hydrogen Energy, Journal Year: 2021, Volume and Issue: 46(56), P. 28554 - 28564

Published: July 11, 2021

Language: Английский

The “weak base route” leading to transition metal–N-heterocyclic carbene complexes DOI
Ekaterina A. Martynova, Nikolaos V. Tzouras, Gianmarco Pisanò

et al.

Chemical Communications, Journal Year: 2021, Volume and Issue: 57(32), P. 3836 - 3856

Published: Jan. 1, 2021

N-Heterocyclic carbenes (NHCs) are nowadays ubiquitous in organometallic chemistry and catalysis. A simple synthetic route to these is presented.

Language: Английский

Citations

83
Manganese(I)-Catalyzed Transfer Hydrogenation and Acceptorless Dehydrogenative Condensation: Promotional Influence of the Uncoordinated N-Heterocycle DOI
Chong Zhang, Bowen Hu, Dafa Chen

et al.

Organometallics, Journal Year: 2019, Volume and Issue: 38(16), P. 3218 - 3226

Published: Aug. 14, 2019

The four bidentate manganese(I) complexes [(C5H4N-C5H3N-OH)Mn(CO)3Br] (1), [(C9H6N-C5H3N-OH)Mn(CO)3Br] (2), [(C8H5N2-C5H3N-OH)Mn(CO)3Br] (3), and [(C8H5N2-C5H3N-OCH3)Mn(CO)3Br] (4) were synthesized. These tested as catalysts for the transfer hydrogenation of ketones, 3 showed highest activity. reactions proceeded well with 0.5 mol % catalyst loading 20 t-BuOK at 85 °C 24 h. Furthermore, was also used a synthesis primary alcohols via aldehydes 1,2-disubstituted benzimidazoles quinolines acceptorless dehydrogenative condensations.

Language: Английский

Citations

53
Efficient methylation of anilines with methanol catalysed by cyclometalated ruthenium complexes DOI Creative Commons

Patrick Piehl,

Roberta Amuso,

Anke Spannenberg

et al.

Catalysis Science & Technology, Journal Year: 2021, Volume and Issue: 11(7), P. 2512 - 2517

Published: Jan. 1, 2021

Cyclometalated ruthenium allow the effective and selective N-methylation of anilines under mild conditions.

Language: Английский

Citations

35
[(PPh3)2NiCl2]-Catalyzed C–N Bond Formation Reaction via Borrowing Hydrogen Strategy: Access to Diverse Secondary Amines and Quinolines DOI
S. N. R. Donthireddy,

Vipin K. Pandey,

Arnab Rit

et al.

The Journal of Organic Chemistry, Journal Year: 2021, Volume and Issue: 86(9), P. 6994 - 7001

Published: April 27, 2021

Commercially available [(PPh3)2NiCl2] was found to be an efficient catalyst for the mono-N-alkylation of (hetero)aromatic amines, employing alcohols deliver diverse secondary including drug intermediates chloropyramine (5b) and mepyramine (5c), in excellent yields (up 97%) via borrowing hydrogen strategy. This method shows a superior activity (TON up 10000) with broad substrate scope at low loading 1 mol % short reaction time. Further, this strategy is also successful accessing various quinoline derivatives following acceptorless dehydrogenation pathway.

Language: Английский

Citations

33
Catalysis with cycloruthenated complexes DOI Creative Commons
Michael T. Findlay, Pablo Domingo‐Legarda, Gillian McArthur

et al.

Chemical Science, Journal Year: 2022, Volume and Issue: 13(12), P. 3335 - 3362

Published: Jan. 1, 2022

Cycloruthenated complexes have been studied extensively over the last few decades. Many accounts of their synthesis, characterisation, and catalytic activity in a wide variety transformations reported to date. Compared with non-cyclometallated analogues, cycloruthenated may display enhanced activities known or possess entirely new reactivity. In other instances, these can be chiral, capable catalysing stereoselective reactions. this review, we aim highlight applications organic emphasising recent advancements field.

Language: Английский

Citations

27
Acceptorless dehydrogenation of primary alcohols to carboxylic acids by self-supported NHC-Ru single-site catalysts DOI

Shenxiang Yin,

Qingshu Zheng, Jie Chen

et al.

Journal of Catalysis, Journal Year: 2022, Volume and Issue: 408, P. 165 - 172

Published: Feb. 26, 2022

Language: Английский

Citations

24
Heteroditopic Ru(II)– and Ir(III)–NHC Complexes with Pendant 1,2,3-Triazole/Triazolylidene Groups: Stereoelectronic Impact on Transfer Hydrogenation of Unsaturated Compounds DOI
Praseetha Mathoor Illam, S. N. R. Donthireddy,

Sayantan Chakrabartty

et al.

Organometallics, Journal Year: 2019, Volume and Issue: 38(13), P. 2610 - 2623

Published: June 26, 2019

Imidazol-2-ylidene (ImNHC) and 1,2,3-traizol-5-ylidene (tzNHC) have been established as important classes of carbene ligands in homogeneous catalysis. To develop Ru(II)/Ir(III) complexes based on these ligand systems considering their electronic well steric profiles for hydride transfer reactions, we employed chelating featuring combinations ImNHC triazole-N or mesoionic tzNHC donors bridged by a CH2 spacer with possible modifications at triazole backbone. In general, synthesized Ru(II) were found to perform significantly better than analogous Ir(III) ketone aldimine reduction. Among the complexes, electron-rich 8/9 general formula [(p-cymene)(ImNHC–CH2–tzNHC)RuII(Cl)]BF4 two different (ImNHC tzNHC) appreciably reduction combination triazole-N-donor ([(p-cymene)(ImNHC–CH2–tz–N)RuII(Cl)]BF4; 4) explaining fine-tuning catalytic systems. No appreciable variation activity was observed between 8 9 having almost similar profiles. However, less bulky complex N-phenyl substituent is more suitable 8, N-3,5-dimethylphenyl that explains influence addition effect process.

Language: Английский

Citations

38
Electronically tuneable orthometalated RuII–NHC complexes as efficient catalysts for C–C and C–N bond formations via borrowing hydrogen strategy DOI
Praseetha Mathoor Illam, Arnab Rit

Catalysis Science & Technology, Journal Year: 2021, Volume and Issue: 12(1), P. 67 - 74

Published: Nov. 10, 2021

A series of simple and electronically tuneable cyclometalated Ru II –NHC complexes have been explored as efficient catalysts for various C–C/N bond forming reactions via a BH methodology.

Language: Английский

Citations

30
Ruthenacycles and Iridacycles as Transfer Hydrogenation Catalysts DOI Creative Commons
Vincent Ritleng, Johannes G. de Vries

Molecules, Journal Year: 2021, Volume and Issue: 26(13), P. 4076 - 4076

Published: July 3, 2021

In this review, we describe the synthesis and use in hydrogen transfer reactions of ruthenacycles iridacycles. The review limits itself to metallacycles where a ligand is bound bidentate fashion either ruthenium or iridium via carbon-metal sigma bond, as well dative bond from heteroatom an N-heterocyclic carbene. Pincer complexes fall outside scope. Described are applications (asymmetric) hydrogenation aldehydes, ketones, imines, reductive aminations. Oxidation reactions, i.e., classical Oppenauer oxidation, which reverse hydrogenation, dehydrogenations oxidations with oxygen, described. Racemizations alcohols secondary amines also catalyzed by

Language: Английский

Citations

28
Ethanol as hydrogen donor: An efficient transfer hydrogenation of aldehydes, ketones, and nitroarenes with H-bonded Ru(II)-N-heterocyclic iminium complex DOI
S. Revathi, Tapas Ghatak

Journal of Catalysis, Journal Year: 2023, Volume and Issue: 429, P. 115207 - 115207

Published: Nov. 20, 2023

Language: Английский

Citations

12