scholarly journals A case study of proton shuttling in palladium catalysis

2016 ◽  
Vol 7 (3) ◽  
pp. 2179-2187 ◽  
Author(s):  
Julien Monot ◽  
Paul Brunel ◽  
Christos E. Kefalidis ◽  
Noel Ángel Espinosa-Jalapa ◽  
Laurent Maron ◽  
...  
Keyword(s):  
Palladium Catalysis ◽  
Catalytic Performance ◽  
Pincer Complexes ◽  
Mechanistic Studies ◽  
Proton Shuttling

Thanks to mechanistic studies, the catalytic performance of SCS indenediide Pd pincer complexes has been spectacularly enhanced using catechol additives as proton shuttles.

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.

Mechanistic Studies on a Cooperative NHC Organocatalysis/Palladium Catalysis System: Uncovering Significant Lessons for Mixed Chiral Pd(NHC)(PR3) Catalyst Design

2017 ◽  
Vol 139 (12) ◽  
pp. 4443-4451 ◽  
Author(s):  
Chang Guo ◽  
Daniel Janssen-Müller ◽  
Mirco Fleige ◽  
Andreas Lerchen ◽  
Constantin G. Daniliuc ◽  
...  
Keyword(s):  
Palladium Catalysis ◽  
Catalyst Design ◽  
Mechanistic Studies

Mechanistic Studies of Alkene Isomerization Catalyzed by CCC-Pincer Complexes of Iridium

2014 ◽  
Vol 33 (2) ◽  
pp. 473-484 ◽  
Author(s):  
Spring Melody M. Knapp ◽  
Sarah E. Shaner ◽  
Daniel Kim ◽  
Dimitar Y. Shopov ◽  
Jennifer A. Tendler ◽  
...  
Keyword(s):  
Pincer Complexes ◽  
Mechanistic Studies ◽  
Alkene Isomerization

scholarly journals (PXP)Mo pincer complexes for catalytic dinitrogen reduction: Synthesis, characterization and mechanistic studies

2020 ◽  
Author(s):  
Santanu Malakar ◽  
Xiaoguang Zhou ◽  
Benjamin Gordon ◽  
Quinton J. Bruch ◽  
Nicholas J. I. Walker ◽  
...  
Keyword(s):  
Pincer Complexes ◽  
Mechanistic Studies ◽  
Dinitrogen Reduction

scholarly journals (PXP)Mo pincer complexes for catalytic dinitrogen reduction: Synthesis, characterization and mechanistic studies

2020 ◽  
Author(s):  
Santanu Malakar ◽  
Xiaoguang Zhou ◽  
Benjamin Gordon ◽  
Quinton J. Bruch ◽  
Nicholas J. I. Walker ◽  
...  
Keyword(s):  
Pincer Complexes ◽  
Mechanistic Studies ◽  
Dinitrogen Reduction

scholarly journals Mechanistic investigations of bipyrimidine-promoted palladium-catalyzed allylic acetoxylation of olefins

2009 ◽  
Vol 87 (1) ◽  
pp. 264-271 ◽  
Author(s):  
Bo-Lin Lin ◽  
Jay A Labinger ◽  
John E Bercaw
Keyword(s):  
Acetic Acid ◽  
Key Words ◽  
Palladium Catalysis ◽  
Allylic Oxidation ◽  
Competition Experiment ◽  
Catalyst Precursor ◽  
Mechanistic Studies ◽  
Allyl Acetate ◽  
Palladium Catalyzed ◽  
Terminal Olefins

Several pyridine-like ligands were found to improve Pd(OAc)2-catalyzed allylic oxidation of allylbenzene to cinnamyl acetate by p-benzoquinone in acetic acid. The best ligand examined, bipyrimidine, was used to identify the catalyst precursor for this system, (bipyrimidine)Pd(OAc)2, which was fully characterized. Mechanistic studies suggest the reaction takes place through disproportionation of (bipyrimidine)Pd(OAc)2 to form a bipyrimidine-bridged dimer, which reacts with olefin to form a PdII-olefin adduct, followed by allylic C–H activation to produce (η3-allyl)PdII species. The (η3-allyl)PdII intermediate undergoes a reversible acetate attack to generate a Pd0-(allyl acetate) adduct, which subsequently reacts with p-benzoquinone to release allyl acetate and regenerate (bipyrimidine)Pd(OAc)2. No KIE is observed for the competition experiment between allylbenzene-d0 and allylbenzene-d5 (CD2=CDCD2C6H5), suggesting that allylic C–H activation is not rate-determining. Catalytic allylic acetoxylations of other terminal olefins as well as cyclohexene were also effected by (bipyrimidine)Pd(OAc)2.Key words: olefin, palladium catalysis, allylic C–H oxidation, p-benzoquinone, bipyrimidine.

scholarly journals Correction to Enhanced Catalytic Performance of Indenediide Palladium Pincer Complexes for Cycloisomerization: Efficient Synthesis of Alkylidene Lactams

ACS Catalysis ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 1565-1566 ◽  
Author(s):  
Noel Ángel Espinosa-Jalapa ◽  
Diandian Ke ◽  
Noel Nebra ◽  
Lucas Le Goanvic ◽  
Sonia Mallet-Ladeira ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Pincer Complexes ◽  
Efficient Synthesis

ChemInform Abstract: Catalytic Performance of Symmetrical and Unsymmetrical Sulfur-Containing Pincer Complexes: Synthesis and Tandem Catalytic Activity of the First PCS-Pincer Palladium Complex.

ChemInform ◽  
2008 ◽  
Vol 39 (40) ◽  
Author(s):  
Marcella Gagliardo ◽  
Nicklas Selander ◽  
Nilesh C. Mehendale ◽  
Gerard van Koten ◽  
Robertus J. M. Klein Gebbink ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Palladium Complex ◽  
Catalytic Performance ◽  
Pincer Complexes ◽  
Sulfur Containing

scholarly journals (PXP)Mo pincer complexes for catalytic dinitrogen reduction: Synthesis, characterization and mechanistic studies

2020 ◽  
Author(s):  
Santanu Malakar ◽  
Xiaoguang Zhou ◽  
Benjamin Gordon ◽  
Quinton J. Bruch ◽  
Nicholas J. I. Walker ◽  
...  
Keyword(s):  
Pincer Complexes ◽  
Mechanistic Studies ◽  
Dinitrogen Reduction
Sign in / Sign up

Export Citation Format

Share Document