Results 201 to 210 of about 27,691 (270)

Palladium-Catalyzed Enantioselective Heck Carbonylation with a Monodentate Phosphoramidite Ligand: Asymmetric Synthesis of (+)-Physostigmine, (+)-Physovenine, and (+)-Folicanthine.

Angewandte Chemie, 2020
We report herein the development of the first monodentate ligand assisted Pd-catalyzed enantioselective domino Heck carbonylation reaction with CO. The highly enantioselective domino Heck carbonylation of N -aryl acrylamides and various nucleophiles ...
Ming Z. Chen, Xucai Wang, Pengfei Yang, Xun Kou, Zhihui Ren, Zheng‐Hui Guan   +5 more
semanticscholar   +1 more source

Carbonyl polyhedra in crystalline carbonyl clusters

Transition Metal Chemistry, 1992
An attempt has been made to elucidate the low-energy modes of vibration of the icosahedral envelope of carbonyl ligands in the series of dodecacarbonyl clusters, Co4(CO)12, RhCo2(CO)12, Ir2Co2(CO)12, and Fe3(CO)12, from an examination of their crystalline structures. It was hoped that this approach would give additional evidence necessary for a clearer
Brian F. G. Johnson, Roderick Edmonds
openaire   +1 more source

Direct synthesis of adipic acid esters via palladium-catalyzed carbonylation of 1,3-dienes

Science, 2019
A carbonylation path to a nylon precursor Adipic acid and its esters are manufactured on a massive scale, primarily to produce nylon. However, the standard route requires large quantities of corrosive nitric acid. J. Yang et al.
Ji Yang, Jiawang Liu, H. Neumann, R. Franke, R. Jackstell, M. Beller   +5 more
semanticscholar   +1 more source

Detoxification of Carbonyl Compounds by Carbonyl Reductase in Neurodegeneration

2016
Oxidative stress in the brain is the major cause of neurodegenerative disorders, including Alzheimer's, Parkinson's, Huntington's, and Creutzfeldt-Jakob diseases or amyotrophic lateral sclerosis. Under conditions of oxidative stress, the production of highly reactive oxygen species (ROS) overwhelms antioxidant defenses, resulting in the modification of
Mohammad Abdur, Rashid, Mahmuda, Haque, Mohammed, Akbar   +2 more
openaire   +2 more sources

Nickel-Catalyzed Carbonylation of Secondary Trifluoromethylated, Difluoromethylated, and Nonfluorinated Aliphatic Electrophiles with Arylboronic Acids under 1 atm of CO

ACS Catalysis, 2020
The nickel-catalyzed carbonylation of aliphatic electrophiles with the most straightforward CO remains challenging. Here, we describe an example of the nickel-catalyzed carbonylation of secondary alkyl halides with arylboronic acids under 1 atm of CO ...
R. Cheng, Hai-Yang Zhao, Shu Zhang, Xingang Zhang   +3 more
semanticscholar   +1 more source

CO2 = CO + [O]: recent advances in carbonylation of C-H bonds with CO2.

Chemical Communications, 2020
Carbon dioxide (CO2) is an ideal one-carbon source owing to its nontoxicity, abundance, availability, and recyclability. Although the thermodynamic stability and kinetic inertness of CO2 bring its utilization challenges, many groups have achieved ...
Lei Song, Yuan-Xu Jiang, Zhen Zhang, Yong-Yuan Gui, Xiao-Yu Zhou, Da‐Gang Yu   +5 more
semanticscholar   +1 more source

Photocatalytic Carbonylation Strategies: A Recent Trend in Organic Synthesis.

Journal of Organic Chemistry, 2020
In the last few decades, photocatalytic radical carbonylation strategies have received considerable attention as they are becoming a formidable tool in the toolbox of organic synthesis. These carbonylation strategies involve the incorporation of a carbon
Jitender Singh, Shivani Sharma, Anuj S. Sharma   +2 more
semanticscholar   +1 more source

Insights into the Pyridine-Modified MOR Zeolite Catalysts for DME Carbonylation

, 2020
Pyridine-modified mordenite (MOR) zeolite catalysts have attracted great attention in recent years due to their unique shape selectivity within eight-membered ring (8-MR) side pockets for dimethyl ...
Kaipeng Cao, Dong Fan, Lingyun Li, Benhan Fan, Linying Wang, Dali Zhu, Quanyi Wang, P. Tian, Zhongmin Liu   +8 more
semanticscholar   +1 more source

The Metal Carbonyls

Science, 1941
When the metal carbonyls were first discovered, their properties were startling because they seemed to violate nearly all the previously recognized generalizations of chemistry. Even to-day the existence of the carbonyls is not particularly emphasized in elementary courses of chemistry because it is rather hard to reconcile them with the first ...
openaire   +2 more sources

Gas-Phase Carbonylation of Dimethyl Ether on the Stable Seed-Derived Ferrierite

, 2020
The higher catalytic activity and stability for a gas-phase carbonylation of dimethyl ether (DME) to methyl acetate (MA) on the seed-derived ferrierite (FER) were attributed to its higher crystalli...
Hyungwon Ham, H. Jung, Hyo Seok Kim, Jihyeon Kim, S. Cho, W. Lee, Myung-June Park, J. Bae   +7 more
semanticscholar   +1 more source