Stepwise Iodide-Free Methanol Carbonylation via Methyl Acetate Activation by Pincer Iridium Complexes

2021 ◽  
Author(s):  
Changho Yoo ◽  
Alexander J. M. Miller
Keyword(s):  
Methyl Acetate ◽  
Iridium Complexes ◽  
Methanol Carbonylation ◽  
Acetate Activation

Efficient methanol carbonylation to methyl acetate catalyzed by a cyclic(alkyl)(amino)carbene iridium complex

2020 ◽  
Vol 10 (17) ◽  
pp. 6045-6049
Author(s):  
Dejin Zhang ◽  
Guoqiang Yang ◽  
Yue Zhao ◽  
Shouyan Shao ◽  
Guisheng Zhu ◽  
...  
Keyword(s):  
Methyl Acetate ◽  
Iridium Complex ◽  
Methanol Carbonylation

An efficient cyclic(alkyl)(amino) carbene iridium complex (C-2) was developed for methanol carbonylation to methyl acetate (MA) directly.

La-Stabilized, Single-Atom Ir/AC Catalyst for Heterogeneous Methanol Carbonylation to Methyl Acetate

2019 ◽  
Vol 58 (12) ◽  
pp. 4755-4763 ◽  
Author(s):  
Siquan Feng ◽  
Xiangen Song ◽  
Zhou Ren ◽  
Yunjie Ding
Keyword(s):  
Methyl Acetate ◽  
Single Atom ◽  
Methanol Carbonylation

Exceptionally stable Rh-based molecular catalyst heterogenized on a cationically charged covalent triazine framework support for efficient methanol carbonylation

2018 ◽  
Vol 8 (11) ◽  
pp. 2894-2900 ◽  
Author(s):  
Kwangho Park ◽  
Sangyup Lim ◽  
Joon Hyun Baik ◽  
Honggon Kim ◽  
Kwang-Deog Jung ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Heterogeneous Catalysts ◽  
Methyl Acetate ◽  
Methanol Carbonylation ◽  
Molecular Catalyst ◽  
Covalent Triazine Framework

Direct carbonylation of methanol into methyl acetate and acetic acid using Rh-based heterogeneous catalysts is of great interest due to their effective levels of activity and stability.

Salt-promoted catalytic methanol carbonylation using iridium pincer-crown ether complexes

2018 ◽  
Vol 8 (12) ◽  
pp. 3133-3143 ◽  
Author(s):  
Lauren C. Gregor ◽  
Javier Grajeda ◽  
Peter S. White ◽  
Andrew J. Vetter ◽  
Alexander J. M. Miller
Keyword(s):  
Crown Ether ◽  
Pincer Ligands ◽  
Iridium Complexes ◽  
Methanol Carbonylation ◽  
Crown Ether Complexes ◽  
Aza Crown Ether

Iridium complexes of pincer ligands containing aza-crown ether macrocycles are precatalysts for methanol carbonylation. Turnover numbers for all acetyl-containing products could be tuned from 265 to 1950 using metal and tetrabutylammonium salts.

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.

Diphosphinoazine Rhodium(I) and Iridium(I) Complexes

2006 ◽  
Vol 71 (2) ◽  
pp. 197-206 ◽  
Author(s):  
Martin Pošta ◽  
Jan Čermák ◽  
Pavel Vojtíšek ◽  
Ivana Císařová
Keyword(s):  
Rhodium Complexes ◽  
Iridium Complexes ◽  
X Ray ◽  
First Time

The first rhodium complexes of diphosphinoazines [{RhCl(1,2-η:5,6-η-CH=CHCH2CH2CH=CHCH2CH2)}2 {μ-R2PCH2C(But)=NN=C(But)CH2PR2] (R = Ph, Cy, Pri) were prepared by cleavage of the bridge in chloro(cycloocta-1,5-diene)rhodium(I) dimer, the analogous iridium(I) complexes were also prepared for the first time. The X-ray structures of isostructural rhodium and iridium complexes with bis(dicyclohexylphosphino)pinacoloneazine were determined. Diphosphinoazine ligands in the complexes remained in (Z,Z) configuration bridging two RhCl(C8H12) units.

scholarly journals Synthesis, characterization, and photoelectric properties of iridium(iii) complexes containing an N hetero-dibenzofuran C^N ligand

RSC Advances ◽  
2021 ◽  
Vol 11 (18) ◽  
pp. 11004-11010
Author(s):  
Zequn Ma ◽  
Chaojun Jing ◽  
Deyu Hang ◽  
Hongtao Fan ◽  
Lumeng Duan ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Green Light ◽  
Iridium Complexes ◽  
Thermal Stabilities ◽  
Photoelectric Properties ◽  
High Efficient

Three high-efficient green light iridium complexes were designed and prepared. Thermal stabilities, electrochemical properties, electroluminescence performances and substituents effects are presented and discussed in this study.

Arene ruthenium, rhodium and iridium complexes containing benzamide derivative ligands: Study of interesting bonding modes, antibacterial, antioxidant and DNA binding studies

2021 ◽  
Vol 937 ◽  
pp. 121731
Author(s):  
Lathewdeipor Shadap ◽  
Nipanshu Agarwal ◽  
Vivek Chetry ◽  
Krishna Mohan Poluri ◽  
Werner Kaminsky ◽  
...  
Keyword(s):  
Dna Binding ◽  
Iridium Complexes ◽  
Binding Studies ◽  
Dna Binding Studies
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