Hydrogenation of Polar Bonds Catalysed by Ruthenium-Pincer Complexes

2014 ◽  
pp. 19-43 ◽  
Author(s):  
Ekambaram Balaraman ◽  
David Milstein
Keyword(s):  
Pincer Complexes

Effect of Hydrated Metal Salts on the Coordination Product of Cobalt(II) halide and PNP Type Ligand, 2,6-bis(di-tertbutylphosphinomethyl) pyridine

2018 ◽  
Author(s):  
Tasneem Siddiquee ◽  
Abdul Goni
Keyword(s):  
Metal Salts ◽  
Molar Ratio ◽  
Pincer Complexes ◽  
Asymmetric Unit ◽  
X Ray Diffraction ◽  
Pincer Ligand ◽  
Tetrahedral Geometry ◽  
X Ray ◽  
Distorted Tetrahedral Geometry ◽  
Cobalt Center

Chemical treatment of CoX<sub>2</sub><b><sup>. </sup></b>6H<sub>2</sub>O (X = Cl, Br, I) with the potentially tridentate PNP pincer ligand 2,6-bis(di-<i>tert</i>-butylphosphinomethyl)pyridine in 1:1 molar ratio results in cobalt(II) halide-PNP pincer complexes. The effect of the hydrated metal source on molecular structure and geometry of the complexes was studied by single crystal X-ray diffraction analysis. The complexes are neutral and the cobalt center adopts a penta-coordinate system with potential atropisomerization. Within the unit cell there are two distinct molecules per asymmetric unit. One of the two phosphorus atoms in the PNP ligand was observed to be partially oxidized to phosphinoxide. Disorder in the structure reflects a mixture of square pyramidal and distorted tetrahedral geometry.

Novel meta-Benzothiazole and Benzimidazole Functionalised POCOP-Ni(II) Pincer Complexes as Efficient Catalysts in the Production of Diarylketones.

2021 ◽  
Author(s):  
Antonio Aldair Castillo-García ◽  
González-Sebastián Lucero ◽  
Leticia Lomas-Romero ◽  
Simon Hernandez-Ortega ◽  
Ruben Alfredo Toscano ◽  
...  
Keyword(s):  
Pincer Complexes ◽  
Aryl Ring

The synthesis of four novel non-symmetric Ni(II)-POCOP pincer complexes meta-functionalized with either benzothiazole or benzimidazole at the central aryl ring is described. All complexes were fully characterised in solution by...

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.

Photo-redox coupled Co-pincer complexes for efficient decarbonylation of aryl carbonyls: A quantum chemical investigation

2021 ◽  
Vol 507 ◽  
pp. 111553
Author(s):  
Animesh Chowdhury ◽  
Santu Biswas ◽  
Sourav Ghoshal ◽  
Anup Pramanik ◽  
Pranab Sarkar
Keyword(s):  
Quantum Chemical ◽  
Chemical Investigation ◽  
Pincer Complexes ◽  
Quantum Chemical Investigation

Access to and reactivity of Fe(0), Fe(‐I), Fe(I) and Fe(II) PCcarbeneP pincer complexes

2021 ◽  
Author(s):  
Qingyang Wang ◽  
Richard A. Manzano ◽  
Hendrik Tinnermann ◽  
Simon Sung ◽  
Baptiste Leforestier ◽  
...  
Keyword(s):  
Pincer Complexes

ChemInform Abstract: Taylor-Made Palladium Pincer Complexes: A New Source of More Efficient Catalysts for Sustainable Organic Synthesis

ChemInform ◽  
2010 ◽  
Vol 41 (46) ◽  
pp. no-no
Author(s):  
Isabel Moreno ◽  
Raul SanMartin ◽  
Blanca Ines ◽  
Fatima Churruca ◽  
Esther Dominguez
Keyword(s):  
Organic Synthesis ◽  
Pincer Complexes

scholarly journals Direct synthesis of doubly deprotonated, dearomatised lutidine PNP Cr and Zr pincer complexes based on isolated K and Li ligand transfer reagents

2016 ◽  
Vol 45 (7) ◽  
pp. 2800-2804 ◽  
Author(s):  
Thomas Simler ◽  
Gilles Frison ◽  
Pierre Braunstein ◽  
Andreas A. Danopoulos
Keyword(s):  
Direct Synthesis ◽  
Pincer Complexes ◽  
Zirconium Complexes ◽  
Ligand Transfer

Double deprotonation of a hybrid bis(phosphino)picoline ligand yields lithium or potassium pincer salts with dearomatised lutidine backbones that afford unusual chromium and zirconium complexes by transmetallation.

Improved Second Generation Iron Pincer Complexes for Effective Ester Hydrogenation

2016 ◽  
Vol 358 (5) ◽  
pp. 820-825 ◽  
Author(s):  
Saravanakumar Elangovan ◽  
Bianca Wendt ◽  
Christoph Topf ◽  
Stephan Bachmann ◽  
Michelangelo Scalone ◽  
...  
Keyword(s):  
Second Generation ◽  
Pincer Complexes

scholarly journals Heterobimetallic Fe–Pd and Fe–Pt NCN pincer complexes (NCN=[C6H2(CH2NMe2)2-2,6]−)

2006 ◽  
Vol 359 (14) ◽  
pp. 4454-4462 ◽  
Author(s):  
Stefan Köcher ◽  
Martin Lutz ◽  
Anthony L. Spek ◽  
Rajendra Prasad ◽  
Gerard P.M. van Klink ◽  
...  
Keyword(s):  
Pincer Complexes
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