Effect of pressure on intramolecular ring-closure reactions of molybdenum carbonyl complexes induced by flash photolysis

1992 ◽  
Vol 440 (1-2) ◽  
pp. 113-117 ◽  
Author(s):  
Kedika Bal Reddy ◽  
B.Ryan Brady ◽  
Edward M. Eyring ◽  
Rudi van Eldik
Keyword(s):  
Flash Photolysis ◽  
Ring Closure ◽  
Carbonyl Complexes ◽  
Effect Of Pressure ◽  
Molybdenum Carbonyl ◽  
Intramolecular Ring

scholarly journals Unexpected Reaction Pathway of the Alpha-Aminoalkyl Radical Derived from One-Electron Oxidation of S-Alkylglutathiones

Molecules ◽  
2020 ◽  
Vol 25 (4) ◽  
pp. 877
Author(s):  
Tomasz Pedzinski ◽  
Krzysztof Bobrowski ◽  
Bronislaw Marciniak ◽  
Piotr Filipiak
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
High Resolution Mass Spectrometry ◽  
Reaction Pathway ◽  
Laser Flash ◽  
Ring Closure ◽  
Unexpected Reaction ◽  
Sulfur Containing ◽  
Resolution Mass ◽  
Intramolecular Ring

Laser flash photolysis and high-resolution mass spectrometry were used to investigate the mechanism of one-electron oxidation of two S-alkylglutathiones using 3-carboxybenzophenone (3CB) as a photosensitizer. This report indicates an unexpected reaction pathway of the α-aminoalkyl radical cation (αN+) derived from the oxidation of S-alkylglutathiones. Instead of a common hydrolysis reaction of αN+ reported earlier for methionine and other sulfur-containing aminoacids and peptides, an intramolecular ring-closure reaction was found for S-alkylglutathiones.

Hydrodesulfurization of Dibenzothiophene Catalyzed by Silica-Alumina Supported Anionic Molybdenum Carbonyl Complexes

1993 ◽  
Vol 22 (4) ◽  
pp. 589-592 ◽  
Author(s):  
Atsushi Ishihara ◽  
Kenji Shirouchi ◽  
Toshiaki Kabe
Keyword(s):  
Carbonyl Complexes ◽  
Silica Alumina ◽  
Molybdenum Carbonyl

Comparison and Synthesis of Molybdenum Carbonyl Complexes Substituted with Mono- and Bis-Triphenylphosphine Ligands for Hydrocracking of Vacuum Residue

2021 ◽  
Vol 21 (7) ◽  
pp. 4085-4088
Author(s):  
Sung Hyeon Kim ◽  
Byeong Min Choi ◽  
Sun Yeong Park ◽  
Ki Hyuk Kang ◽  
MinChul Chung ◽  
...  
Keyword(s):  
Coke Formation ◽  
Energy Industry ◽  
Vacuum Residue ◽  
Heavy Oils ◽  
Carbonyl Complexes ◽  
Triphenyl Phosphine ◽  
Thermal Decomposition Behavior ◽  
Similar Weight ◽  
Molybdenum Carbonyl ◽  
Decomposition Behavior

(PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 were synthesized by the reaction of molybdenum hexacar-bonyl with triphenylphosphine and applied as precursors to hydrocracking of vacuum residue under high-pressure and high-temperature conditions. (PPh3)2Mo(CO)4 could also be synthesized by the reaction of (PPh3)Mo(CO)5 with triphenyl phosphine. A commercial precursor (Mo-octoate) for hydrocracking of vacuum residue was used for comparison. The thermal decomposition behavior of (PPh3)Mo(CO)5, (PPh3)2Mo(CO)4, and Mo-octoate was also examined by the thermogravimetric analysis. The TGA curve of (PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 showed a similar weight-loss pattern. (PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 were decomposed into Mo metal and ligands rapidly in the range of 140 °C~270 °C. There were no ligands bound to a metal center of (PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 at the reaction temperature (430 °C) of hydrocracking. The amount of coke formed after hydrocracking over (PPh3)Mo(CO)5 and (PPh3)2Mo(CO)4 was 2.3% and 0.5%, respectively. Upgrading the qualities of heavy oils is an important issue in the energy industry. It is not easy to achieve the complete conversion of vacuum residue due to coke forming during hydrocracking of vacuum residue. This study showed that (PPh3)2Mo(CO)4 was considerably effective in reducing coke formation.

scholarly journals TfOH-Promoted Reaction of 2,4-Diaryl-1,1,1-Trifluorobut-3-yn-2-oles with Arenes: Synthesis of 1,3-Diaryl-1-CF3-Indenes and Versatility of the Reaction Mechanisms

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3079 ◽  
Author(s):  
Aleksey V. Zerov ◽  
Anna N. Kazakova ◽  
Irina A. Boyarskaya ◽  
Taras L. Panikorovskii ◽  
Vitalii V. Suslonov ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Reaction Mechanisms ◽  
Room Temperature ◽  
Ring Closure ◽  
Nucleophilic Attack ◽  
New Process ◽  
Intramolecular Ring ◽  
Propargyl Alcohols

The TfOH-mediated reactions of 2,4-diaryl-1,1,1-trifluorobut-3-yn-2-oles (CF3-substituted diaryl propargyl alcohols) with arenes in CH2Cl2 afford 1,3-diaryl-1-CF3-indenes in yields up to 84%. This new process for synthesis of such CF3-indenes is complete at room temperature within one hour. The synthetic potential, scope, and limitations of this reaction were illustrated by more than 70 examples. The proposed reaction mechanism invokes the formation of highly reactive CF3-propargyl cation intermediates that can be trapped at the two mesomeric positions by the intermolecular nucleophilic attack of an arene partner with a subsequent intramolecular ring closure.

A radical mechanism of the reaction of molybdenum carbonyl complexes with bis(triethylgermyl)mercury

1993 ◽  
Vol 42 (9) ◽  
pp. 1585-1587
Author(s):  
M. I. Sykhrannova ◽  
A. N. Tatarnikov ◽  
S. Ya. Khorshev ◽  
E. N. Gladyshev
Keyword(s):  
Radical Mechanism ◽  
Carbonyl Complexes ◽  
Molybdenum Carbonyl ◽  
Mechanism Of The Reaction
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