C–H functionalization by high-valent Cp*Co(iii) catalysis

2017 ◽  
Vol 53 (22) ◽  
pp. 3165-3180 ◽  
Author(s):  
Shan Wang ◽  
Shan-Yong Chen ◽  
Xiao-Qi Yu
Keyword(s):  
Transition Metals ◽  
Significant Progress ◽  
Earth Abundant ◽  
High Valent

Significant progress has been accomplished in directed C–H functionalization through the use of earth-abundant and inexpensive first-row transition metals.

scholarly journals Aromaticity Driven Electrocatalytic Water Oxidation by a Phosphorus-Nitrogen PN3-Pincer Cobalt Complex

2019 ◽  
Author(s):  
Pradip K. Das ◽  
Sarmistha Bhunia ◽  
Priyanka Chakraborty ◽  
Atanu Rana ◽  
Abhishek Dey ◽  
...  
Keyword(s):  
Water Oxidation ◽  
High Efficiency ◽  
Cobalt Complex ◽  
Potential Jump ◽  
Onset Potential ◽  
New Strategy ◽  
Earth Abundant ◽  
High Valent ◽  
Lower Overpotential ◽  
Cobalt Species

Water oxidation is the primary step in both natural and artificial photosynthesis to convert solar energy in into chemical fuels. Herein, we report the first cobalt-based pincer catalyst for electrolytic water oxidation at neutral pH with high efficiency under electrochemical conditions. Most importantly, ligand (pseudo)aromaticity is identified to play an important role in the electrocatalysis. A significant potential jump (~300 mV) was achieved towards a lower positive value when the aromatized cobalt complex was transformed to a (pseudo)dearomatized cobalt species. This complex catalyzes the water oxidation in its high valent oxidation state at a much lower overpotential (~ 340 mV vs. NHE) based on the onset potential (0.5 mA/cm<sup>2</sup>) of catalysis at pH 10.5, outperforming all the other literature systems. These observations may provide a new strategy for the design of earth-abundant transition metal-based water oxidation catalysts.

scholarly journals The reactions of α-amino acids and α-amino acid esters with high valent transition metal halides: synthesis of coordination complexes, activation processes and stabilization of α-ammonium acylchloride cations

RSC Advances ◽  
2017 ◽  
Vol 7 (17) ◽  
pp. 10158-10174 ◽  
Author(s):  
Lorenzo Biancalana ◽  
Marco Bortoluzzi ◽  
Eleonora Ferretti ◽  
Mohammad Hayatifar ◽  
Fabio Marchetti ◽  
...  
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Transition Metal ◽  
Transition Metals ◽  
Coordination Compounds ◽  
Coordination Complexes ◽  
Amino Acid Esters ◽  
Metal Halides ◽  
High Valent ◽  
Acid Esters

We describe the synthesis of rare coordination compounds of early transition metals with α-amino acids and α-amino acid esters, the unusual C–C dimerization ofl-proline, and the stabilization of reactive α-ammonium acylchloride cations.

Pauson­Khand-type reaction mediated by Rh(I) catalysts

2002 ◽  
Vol 74 (1) ◽  
pp. 85-91 ◽  
Author(s):  
Nakcheol Jeong ◽  
Byung Ki Sung ◽  
Jin Sung Kim ◽  
Soon Bong Park ◽  
Sung Deok Seo ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Transition Metals ◽  
Significant Progress ◽  
One Pot ◽  
Type Reaction ◽  
Dicobalt Octacarbonyl

Cocyclization of alkynes, alkenes, and carbon monoxide by transition metals (known as Pauson­Khand reaction when dicobalt octacarbonyl complexes are used) has been accepted as one of the most powerful tools in the synthesis of cyclopentenones. Despite significant progress in the various aspects of the reaction, we still needed new catalysts to expand the scope of the reaction further. We found rhodium (I) catalysts, e.g., RhCl(PPh3)3, trans-RhCl(CO)(PPh3)2, RhCl-(CO)(dppe), and trans-[RhCl(CO)(dppp)]2, were also effective for this transformation. The scope and the efficiencies of the reaction could be tuned and expanded by the choice of catalysts. For example, we were able to devise an enantioselective PK-type reaction and a tandem strategy employing two catalysts in one pot. These results will be presented.

Oxidative Transformations of Biosourced Alcohols Catalyzed by Earth-Abundant Transition Metals

ChemCatChem ◽  
2017 ◽  
Vol 9 (14) ◽  
pp. 2652-2660 ◽  
Author(s):  
Duc Hanh Nguyen ◽  
Yohann Morin ◽  
Lei Zhang ◽  
Xavier Trivelli ◽  
Frédéric Capet ◽  
...  
Keyword(s):  
Transition Metals ◽  
Earth Abundant ◽  
Oxidative Transformations

scholarly journals Synthesis of Plakortolides E and I Enabled by Base Metal Catalysis

2021 ◽  
Author(s):  
Stefan Leisering ◽  
Alexandros Mavroskoufis ◽  
Patrick Voßnacker ◽  
Reinhold Zimmer ◽  
Mathias Christmann
Keyword(s):  
Natural Products ◽  
Transition Metals ◽  
Base Metal ◽  
Protecting Group ◽  
Efficient Synthesis ◽  
One Pot ◽  
Metal Catalysis ◽  
Bond Forming ◽  
Earth Abundant ◽  
Key Steps

A protecting-group-free synthesis of two endoperoxide natural products, plakortolide E and plakortolide I, is reported. Key-steps feature the use of earth-abundant transition metals, consisting of a vanadium-mediated epoxidation, an iron-catalyzed allylic substitution, and a cobalt-induced endoperoxide formation. Our approach combines redox-economy, chemoselective bond-forming reactions, and telescoping into one-pot operations to forge an overall efficient synthesis.

Photoactive iron complexes: More sustainable, but still a challenge

2021 ◽  
Author(s):  
Philipp Dierks ◽  
Yannik Vukadinovic ◽  
Matthias Bauer
Keyword(s):  
Transition Metals ◽  
Precious Metal ◽  
Iron Complexes ◽  
Metal Catalysts ◽  
Significant Progress ◽  
Sustainable Future ◽  
Precious Metal Catalysts

On transition metals such as iron rests lots of hope to replace precious metal catalysts in the field of photochemistry for a more sustainable future. Indeed, significant progress has been...

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