scholarly journals Iridium complexes catalysed the selective dehydrogenation of glucose to gluconic acid in water

2018 ◽  
Vol 20 (17) ◽  
pp. 4094-4101 ◽  
Author(s):  
Pilar Borja ◽  
Cristian Vicent ◽  
Miguel Baya ◽  
Hermenegildo García ◽  
Jose A. Mata
Keyword(s):  
Gluconic Acid ◽  
Catalytic Dehydrogenation ◽  
Iridium Complexes

A catalytic dehydrogenation process for the production of gluconic acid from glucose and starch is reported here.

scholarly journals Formation of Enamines via Catalytic Dehydrogenation by Pincer-Iridium Complexes

2019 ◽  
Author(s):  
Xiawei Zhang ◽  
Santanu Malakar ◽  
Karsten Krogh-Jespersen ◽  
Faraj Hasanayn ◽  
Alan Goldman
Keyword(s):  
Isotope Effects ◽  
Oxidative Addition ◽  
Kinetic Isotope Effects ◽  
Catalytic Dehydrogenation ◽  
Iridium Complexes ◽  
Tertiary Amines ◽  
Iridium Catalysts ◽  
Kinetic Isotope ◽  
Dehydrogenation Mechanism

Efficient pincer-ligated iridium catalysts are reported for the dehydrogenation of simple tertiary amines to give enamines, and for the dehydrogenation of β-functionalized amines to give the corresponding 1,2-difunctionalized olefins. Experimentally determined kinetic isotope effects in conjunction with DFT-based analysis support a dehydrogenation mechanism involving initial pre-equilibrium oxidative addition of the amine α C-H bond followed by rate-determining elimination of the β-C-H bond.<br>

Formation of Enamines via Catalytic Dehydrogenation by Pincer-Iridium Complexes

2020 ◽  
Vol 85 (5) ◽  
pp. 3020-3028 ◽  
Author(s):  
Yansong J. Lu ◽  
Xiawei Zhang ◽  
Santanu Malakar ◽  
Karsten Krogh-Jespersen ◽  
Faraj Hasanayn ◽  
...  
Keyword(s):  
Catalytic Dehydrogenation ◽  
Iridium Complexes

scholarly journals Formation of Enamines via Catalytic Dehydrogenation by Pincer-Iridium Complexes

2019 ◽  
Author(s):  
Xiawei Zhang ◽  
Santanu Malakar ◽  
Karsten Krogh-Jespersen ◽  
Faraj Hasanayn ◽  
Alan Goldman
Keyword(s):  
Isotope Effects ◽  
Oxidative Addition ◽  
Kinetic Isotope Effects ◽  
Catalytic Dehydrogenation ◽  
Iridium Complexes ◽  
Tertiary Amines ◽  
Iridium Catalysts ◽  
Kinetic Isotope ◽  
Dehydrogenation Mechanism

Efficient pincer-ligated iridium catalysts are reported for the dehydrogenation of simple tertiary amines to give enamines, and for the dehydrogenation of β-functionalized amines to give the corresponding 1,2-difunctionalized olefins. Experimentally determined kinetic isotope effects in conjunction with DFT-based analysis support a dehydrogenation mechanism involving initial pre-equilibrium oxidative addition of the amine α C-H bond followed by rate-determining elimination of the β-C-H bond.<br>

scholarly journals Reversible catalytic dehydrogenation of alcohols for energy storage

2015 ◽  
Vol 112 (6) ◽  
pp. 1687-1692 ◽  
Author(s):  
Peter J. Bonitatibus ◽  
Sumit Chakraborty ◽  
Mark D. Doherty ◽  
Oltea Siclovan ◽  
William D. Jones ◽  
...  
Keyword(s):  
Energy Storage ◽  
Fuel Cell ◽  
Homogeneous Catalysis ◽  
Partial Oxidation ◽  
Catalytic Reaction ◽  
Pincer Complexes ◽  
Catalytic Dehydrogenation ◽  
Secondary Alcohols ◽  
Iridium Complexes ◽  
Primary Alcohols

Reversibility of a dehydrogenation/hydrogenation catalytic reaction has been an elusive target for homogeneous catalysis. In this report, reversible acceptorless dehydrogenation of secondary alcohols and diols on iron pincer complexes and reversible oxidative dehydrogenation of primary alcohols/reduction of aldehydes with separate transfer of protons and electrons on iridium complexes are shown. This reactivity suggests a strategy for the development of reversible fuel cell electrocatalysts for partial oxidation (dehydrogenation) of hydroxyl-containing fuels.

Triazolylidene-Iridium Complexes with a Pendant Pyridyl Group for Cooperative Metal-Ligand Induced Catalytic Dehydrogenation of Amines

2017 ◽  
Vol 23 (37) ◽  
pp. 8901-8911 ◽  
Author(s):  
Marta Valencia ◽  
Ana Pereira ◽  
Helge Müller-Bunz ◽  
Tomás R. Belderraín ◽  
Pedro J. Pérez ◽  
...  
Keyword(s):  
Catalytic Dehydrogenation ◽  
Iridium Complexes ◽  
Pyridyl Group ◽  
Metal Ligand

scholarly journals Catalytic Dehydrogenation of Alkanes by PCP–Pincer Iridium Complexes Using Proton and Electron Acceptors

ACS Catalysis ◽  
2021 ◽  
pp. 3009-3016
Author(s):  
Arun Dixith Reddy Shada ◽  
Alexander J. M. Miller ◽  
Thomas J. Emge ◽  
Alan S. Goldman
Keyword(s):  
Electron Acceptors ◽  
Catalytic Dehydrogenation ◽  
Iridium Complexes ◽  
Pcp Pincer

Regioselective Gas-Phase n-Butane Transfer Dehydrogenation via Silica-Supported Pincer-Iridium Complexes

2020 ◽  
Author(s):  
Boris Sheludko ◽  
Cristina Castro ◽  
Chaitanya Khalap ◽  
Thomas Emge ◽  
Alan Goldman ◽  
...  
Keyword(s):  
Gas Phase ◽  
Active Site ◽  
Lower Cost ◽  
Open Systems ◽  
Iridium Complexes ◽  
Terminal Olefin ◽  
Molecular Precursors ◽  
Sterically Demanding ◽  
Olefin Production ◽  
Steam Cracking

<b>Abstract:</b> The production of olefins via on-purpose dehydrogenation of alkanes allows for a more efficient, selective and lower cost alternative to processes such as steam cracking. Silica-supported pincer-iridium complexes of the form [(≡SiO-<sup>R4</sup>POCOP)Ir(CO)] (<sup>R4</sup>POCOP = κ<sup>3</sup>-C<sub>6</sub>H<sub>3</sub>-2,6-(OPR<sub>2</sub>)<sub>2</sub>) are effective for acceptorless alkane dehydrogenation, and have been shown stable up to 300 °C. However, while solution-phase analogues of such species have demonstrated high regioselectivity for terminal olefin production under transfer dehydrogenation conditions at or below 240 °C, in open systems at 300 °C, regioselectivity under acceptorless dehydrogenation conditions is consistently low. In this work, complexes <a>[(≡SiO-<i><sup>t</sup></i><sup>Bu4</sup>POCOP)Ir(CO)] </a>(<b>1</b>) and [(≡SiO-<i><sup>i</sup></i><sup>Pr4</sup>PCP)Ir(CO)] (<b>2</b>) were synthesized via immobilization of molecular precursors. These complexes were used for gas-phase butane transfer dehydrogenation using increasingly sterically demanding olefins, resulting in observed selectivities of up to 77%. The results indicate that the active site is conserved upon immobilization.

Sign in / Sign up

Export Citation Format

Share Document