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

Prototropic rearrangements in cycloheptatrienyl PCP pincer iridium complexes

2008 ◽  
pp. 527-532 ◽  
Author(s):  
Angelika M. Winter ◽  
Klaus Eichele ◽  
Hans-Georg Mack ◽  
William C. Kaska ◽  
Hermann A. Mayer
Keyword(s):  
Iridium Complexes ◽  
Pcp Pincer

Benzo annulated cycloheptatriene PCP pincer iridium complexes

2014 ◽  
Vol 43 (32) ◽  
pp. 12187-12199 ◽  
Author(s):  
Wolfgang Leis ◽  
Sophie Wernitz ◽  
Benedikt Reichart ◽  
David Ruckerbauer ◽  
Johannes Wolfram Wielandt ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Iridium Complexes ◽  
Pincer Complex ◽  
Pcp Pincer

Chemical conversions of a cycloheptatriene iridium pincer complex were studied by NMR and MS techniques as well as DFT calculations.

scholarly journals Crystal structure of an iridium(III) complex of the [C(dppm)2] PCP pincer ligand system and its conjugate CH acid form

2018 ◽  
Vol 74 (5) ◽  
pp. 620-624 ◽  
Author(s):  
Christian Reitsamer ◽  
Inge Schlapp-Hackl ◽  
Gabriel Partl ◽  
Walter Schuh ◽  
Holger Kopacka ◽  
...  
Keyword(s):  
Carbon Atom ◽  
Iridium Complexes ◽  
Pincer Ligand ◽  
Single Crystal Diffraction ◽  
Dalton Trans ◽  
Ligand System ◽  
Distorted Octahedral ◽  
Major Interest ◽  
Carbonyl Bond ◽  
Pcp Pincer

After the successful creation of the newly designed PCP carbodiphosphorane (CDP) ligand [Reitsamer et al. (2012). Dalton Trans. 41, 3503–3514; Stallinger et al. (2007). Chem. Commun. pp. 510–512], the treatment of this PCP pincer system with the transition metal iridium and further the analysis of the structures by single-crystal diffraction and by NMR spectroscopy were of major interest. Two different iridium complexes, namely (bis{[(diphenylphosphanyl)methyl]diphenylphosphanylidene}methane-κ3 P,C,P′)carbonylchloridohydridoiridium(III) chloride dichloromethane trisolvate, [IrIII(CO){C(dppm)2-κ3 P,C,P′}ClH]Cl·3CH2Cl2 (1) and the closely related (bis{[(diphenylphosphanyl)methyl]diphenylphosphanylidene}methanide(1+)-κ3 P,C,P′)carbonylchloridohydridoiridium(III) dichloride–hydrochloric acid–water (1/2/5.5), [IrIII(CO){CH(dppm)2-κ3 P,C,P′)ClH]Cl}2 (2), have been designed and both complexes show a slightly distorted octahedral coordinated IrIII centre. The PCP pincer ligand system is arranged in a meridional manner, the CO ligand is located trans to the central PCP carbon and a hydride and chloride are located perpendicular above and below the P2C2 plane. With an Ir—CCDP distance of 2.157 (5) Å, an Ir—CO distance of 1.891 (6) Å and a quite short C—O distance of 1.117 (7) Å, complex 1 presents a strong carbonyl bond. Complex 2, the corresponding CH acid of 1, shows an additionally attached proton at the carbodiphosphorane carbon atom located antiperiplanar to the hydride of the metal centre. In comparison with complex 1, the Ir—CCDP distance of 2.207 (3) Å is lengthened and the Ir—C—O values indicate a weaker trans influence of the central carbodiphosphorane carbon atom.

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.

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.

Oxidative Addition of Water by an Iridium PCP Pincer Complex:  Catalytic Dehydrogenation of Alkanes by IrH(OH){C6H3-2,6-(CH2PBut2)2}

2001 ◽  
Vol 20 (6) ◽  
pp. 1144-1147 ◽  
Author(s):  
David Morales-Morales ◽  
Do W. Lee ◽  
Zhaohui Wang ◽  
Craig M. Jensen
Keyword(s):  
Oxidative Addition ◽  
Catalytic Dehydrogenation ◽  
Pincer Complex ◽  
Pcp Pincer
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