scholarly journals HCOOH disproportionation to MeOH promoted by molybdenum PNP complexes

2021 ◽  
Vol 12 (39) ◽  
pp. 13101-13119
Author(s):  
Elisabetta Alberico ◽  
Thomas Leischner ◽  
Henrik Junge ◽  
Anja Kammer ◽  
Rui Sang ◽  
...  
Keyword(s):  
Formic Acid ◽  
Noble Metal ◽  
Pincer Ligands ◽  
Turnover Number ◽  
Metal Catalyzed

Mo(0) complexes with aliphatic PNP-pincer ligands enable the first example of non-noble metal catalyzed formic acid disproportionation leading to methanol with a selectivity of up to 37% and a turnover number up to 69.

Base‐Free Non‐Noble‐Metal‐Catalyzed Hydrogen Generation from Formic Acid: Scope and Mechanistic Insights

2014 ◽  
Vol 20 (42) ◽  
pp. 13589-13602 ◽  
Author(s):  
Dörthe Mellmann ◽  
Enrico Barsch ◽  
Matthias Bauer ◽  
Kathleen Grabow ◽  
Albert Boddien ◽  
...  
Keyword(s):  
Formic Acid ◽  
Noble Metal ◽  
Hydrogen Generation ◽  
Metal Catalyzed

Noble Metal-Catalyzed Ammonia Generation by Formic Acid Reduction of Nitrate in Simulated Nuclear Waste Media

1997 ◽  
Vol 31 (4) ◽  
pp. 984-992 ◽  
Author(s):  
R. B. King ◽  
N. K. Bhattacharyya ◽  
H. D. Smith ◽  
K. D. Wiemers
Keyword(s):  
Formic Acid ◽  
Noble Metal ◽  
Nuclear Waste ◽  
Metal Catalyzed ◽  
Acid Reduction

scholarly journals Manganese-Catalyzed Asymmetric Hydrogenation of Quinolines Enabled by a Dual “N–H Effect”

2020 ◽  
Author(s):  
Chenguang Liu ◽  
Mingyang Wang ◽  
Shihan Liu ◽  
Yujie Wang ◽  
Yong Peng ◽  
...  
Keyword(s):  
Noble Metal ◽  
Asymmetric Hydrogenation ◽  
High Reactivity ◽  
Catalyst Loading ◽  
Turnover Number ◽  
Noble Metal Catalysts ◽  
Wide Range ◽  
Metal Catalyzed ◽  
High Yields ◽  
Low Catalyst Loading

<p>The first example of non-noble metal-catalyzed asymmetric hydrogenation of aromatic <i>N</i>-heterocycles is reported. A new chiral pincer manganese catalyst showed outstanding catalytic activity in the asymmetric hydrogenation of a wide range of quinolines, affording high yields and excellent enantioselectivities (up to 97% <i>ee</i>). A turnover number of 3840 was reached at a low catalyst loading (S/C=4000), which was competitive with the activity of most effective noble metal catalysts for this reaction. The high reactivity of the manganese catalyst and a precise regulation of the enantioselectivity were ensured by a dual “N–H” effect of the ligand structure.<u></u></p>

Manganese-Catalyzed Asymmetric Hydrogenation of Quinolines Enabled by pi–pi Interaction

2020 ◽  
Author(s):  
Chenguang Liu ◽  
Mingyang Wang ◽  
Shihan Liu ◽  
Yujie Wang ◽  
Yong Peng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Noble Metal ◽  
Asymmetric Hydrogenation ◽  
Catalyst Loading ◽  
Turnover Number ◽  
Noble Metal Catalysts ◽  
Wide Range ◽  
Metal Catalyzed ◽  
High Yields ◽  
Low Catalyst Loading

<p>The first example of non-noble metal-catalyzed asymmetric hydrogenation of aromatic <i>N</i>-heterocycles is reported. A new chiral pincer manganese catalyst showed outstanding catalytic activity in the asymmetric hydrogenation of a wide range of quinolines, affording high yields and excellent enantioselectivities (up to 97% <i>ee</i>). A turnover number of 3840 was reached at a low catalyst loading (S/C=4000), which was competitive with the activity of most effective noble metal catalysts for this reaction. The precise regulation of the enantioselectivity were ensured by a p–p interaction.<u></u></p>

scholarly journals Manganese-Catalyzed Asymmetric Hydrogenation of Quinolines Enabled by pi–pi Interaction

2020 ◽  
Author(s):  
Chenguang Liu ◽  
Mingyang Wang ◽  
Shihan Liu ◽  
Yujie Wang ◽  
Yong Peng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Noble Metal ◽  
Asymmetric Hydrogenation ◽  
Catalyst Loading ◽  
Turnover Number ◽  
Noble Metal Catalysts ◽  
Wide Range ◽  
Metal Catalyzed ◽  
High Yields ◽  
Low Catalyst Loading

<p>The first example of non-noble metal-catalyzed asymmetric hydrogenation of aromatic <i>N</i>-heterocycles is reported. A new chiral pincer manganese catalyst showed outstanding catalytic activity in the asymmetric hydrogenation of a wide range of quinolines, affording high yields and excellent enantioselectivities (up to 97% <i>ee</i>). A turnover number of 3840 was reached at a low catalyst loading (S/C=4000), which was competitive with the activity of most effective noble metal catalysts for this reaction. The precise regulation of the enantioselectivity were ensured by a p–p interaction.<u></u></p>

scholarly journals Additive-Free Formic Acid Dehydrogenation Catalyzed by a Cobalt Complex

2020 ◽  
Author(s):  
Nicolas Lentz ◽  
Alicia Aloisi ◽  
Pierre Thuéry ◽  
Emmanuel Nicolas ◽  
Thibault Cantat
Keyword(s):  
Formic Acid ◽  
Cobalt Complex ◽  
Intermediate Formation ◽  
Mechanistic Study ◽  
Catalytic Dehydrogenation ◽  
Turnover Number ◽  
Promising Solution ◽  
The Common ◽  
Safe Transport ◽  
Formic Acid Dehydrogenation

The reversible storage of hydrogen through the intermediate formation of Formic Acid (FA) is a promising solution to its safe transport and distribution. However, the common necessity of using bases or additives in the catalytic dehydrogenation of FA is a limitation. In this context, two new cobalt complexes (<b>1</b> and <b>2</b>) were synthesized with a pincer PP(NH)P ligand containing a phosphoramine moiety. Their reaction with an excess FA yields a cobalt(I)-hydride complex (<b>3</b>). We report here the unprecedented catalytic activity of <b>3</b> in the dehydrogenation of FA, with a turnover frequency (TOF) of 4000 h<sup>-1</sup> and a turnover number (TON) of 454, without the need for bases or additives. A mechanistic study reveals that the ligand has a non-innocent behaviour due to intermolecular hydrogen bonding, which is influenced by the concentration of formic acid

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