Sulfur Radical-Induced Redox Modifications in Proteins: Analysis and Mechanistic Aspects

2017 ◽  
Vol 26 (8) ◽  
pp. 388-405 ◽  
Author(s):  
Christian Schöneich
Keyword(s):  
Sulfur Radical

scholarly journals Electrosynthesis of 1,4-bis(diphenylphosphanyl) tetrasulfide via sulfur radical addition as cathode material for rechargeable lithium battery

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Dan-Yang Wang ◽  
Yubing Si ◽  
Wei Guo ◽  
Yongzhu Fu
Keyword(s):  
Density Functional ◽  
Chemical Space ◽  
Functional Materials ◽  
Radical Addition ◽  
Chemical Diversity ◽  
Energy Storage Materials ◽  
Intramolecular Rearrangement ◽  
Synthesis Methods ◽  
Dithiophosphinic Acid ◽  
Sulfur Radical

AbstractOrganic electrodes are promising as next generation energy storage materials originating from their enormous chemical diversity and electrochemical specificity. Although organic synthesis methods have been extended to a broad range, facile and selective methods are still needed to expose the corners of chemical space. Herein, we report the organopolysulfide, 1,4-bis(diphenylphosphanyl)tetrasulfide, which is synthesized by electrochemical oxidation of diphenyl dithiophosphinic acid featuring the cleavage of a P–S single bond and a sulfur radical addition reaction. Density functional theory proves that the external electric field triggers the intramolecular rearrangement of diphenyl dithiophosphinic acid through dehydrogenation and sulfur migration along the P–S bond axis. Impressively, the Li/bis(diphenylphosphanyl)tetrasulfide cell exhibits the high discharge voltage of 2.9 V and stable cycling performance of 500 cycles with the capacity retention of 74.8%. Detailed characterizations confirm the reversible lithiation/delithiation process. This work demonstrates that electrochemical synthesis offers the approach for the preparation of advanced functional materials.

ChemInform Abstract: PULSE RADIOLYSIS GENERATION OF SULFUR RADICAL CATIONS STABILIZED BY NEIGHBORING CARBOXYLATE AND ALCOHOL GROUPS

1984 ◽  
Vol 15 (51) ◽  
Author(s):  
R. S. GLASS ◽  
M. HOJJATIE ◽  
G. S. WILSON ◽  
S. MAHLING ◽  
M. GOEBL ◽  
...  
Keyword(s):  
Pulse Radiolysis ◽  
Radical Cations ◽  
Sulfur Radical

scholarly journals Photocatalytic Oxidative C–H Thiolation: Synthesis of Benzothiazoles and Sulfenylated Indoles

Synlett ◽  
2019 ◽  
Vol 30 (14) ◽  
pp. 1648-1655 ◽  
Author(s):  
Andrew N. Dinh ◽  
Ashley D. Nguyen ◽  
Ernesto Millan Aceves ◽  
Samuel T. Albright ◽  
Mario R. Cedano ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Cyclic Voltammetry ◽  
Intramolecular Cyclization ◽  
Density Functional ◽  
Functional Theory ◽  
Intermolecular Reaction ◽  
Sulfur Radical

We report studies on the photocatalytic formation of C–S bonds to form benzothiazoles via an intramolecular cyclization and sulfenylated indoles via an intermolecular reaction. Cyclic voltammetry (CV) and density functional theory studies suggest that benzothiazole formation proceeds via a mechanism that involves an electrophilic sulfur radical, while the indole sulfenylation likely proceeds via a nucleophilic sulfur radical adding into a radical cationic indole. These conditions were successfully extended to several thiobenzamides and indole substrates.

Ultramarin-Gelb II: Herstellung und Charakterisierung einer Rarität / Ultramarine-Yellow II: Preparation and Characterization of a Rarity

1987 ◽  
Vol 42 (6) ◽  
pp. 663-665 ◽  
Author(s):  
P. Köhler ◽  
G. Winter ◽  
F. Seel ◽  
K.-P. Klos
Keyword(s):  
Thermal Decomposition ◽  
Missing Link ◽  
X Ray ◽  
Red Fluorescence ◽  
Spectrometric Measurements ◽  
Powder Analysis ◽  
Ultramarine Pigments ◽  
Sulfur Radical

Abstract The missing link in the series of ultramarine pigments, a synthetic sodalite containing yellow S2- ions, was prepared by thermal decomposition of a thiocyanate sodalite under vacuum or nitrogen. The nature of the product has been elucidated through X-ray powder analysis, VIS/UV-and ESR-spectrometric measurements, and by the observation of the brilliant red fluorescence of the sulfur radical ion S2-.

scholarly journals SARS-CoV-2 ARDS by NLRP3 & ICU Treatment

2020 ◽  
Author(s):  
Badar Kanwar ◽  
Jenny Balentine ◽  
Chul Joong Lee ◽  
Consolato Sergi ◽  
Asif Khattak ◽  
...  
Keyword(s):  
Direct Interaction ◽  
Methionine Sulfoxide ◽  
Diaminodiphenyl Sulfone ◽  
Electron Charge Transfer ◽  
Radical Production ◽  
Free Amine ◽  
Repeat Domain ◽  
N Terminus ◽  
Lysine Residues ◽  
Sulfur Radical

4,4′-Diaminodiphenyl sulfone (Dapsone, DDS) targets COVID-19 as a key to ending the current ARDS by SARS-CoV-2. Dapsone is an inflammasome competitor commonly used in combination with clofazimine-rifampicin for the treatment of leprosy. Dapsone binds to myeloperoxidase and regulates hypochlorite production, thereby reducing the inflammatory response of cells and has a structure that can reduce the sulfur radical production rate by electron charge transfer because they are structurally similar to methionine sulfoxide. Nucleophilic properties of dapsone compete with ubiquitin by attacking a ubiquitin (Ub)-conjugating enzyme (E2)–Ub thioester linkage. The best-described sites are the amine-containing internal lysine residues and the free amine of the polypeptide backbone’s N-terminus. ORF8b activates NLRP3 through direct interaction of the AT-rich repeat domain of NLRP3. Nucleophilic properties of DDS compete with NLRP3. Dapsone’s four mechanisms have treated ARDS and prevented SARS-CoV-2 infection.

ESR-Spectroscopic Detection of a[33S]-Sulfur Radical

1965 ◽  
Vol 4 (3) ◽  
pp. 243-244 ◽  
Author(s):  
W. Rundel ◽  
K. Scheffler
Keyword(s):  
Sulfur Radical

Photoionization studies of sulfur radicals and products of their reactions

1998 ◽  
Vol 5 (3) ◽  
pp. 1041-1043 ◽  
Author(s):  
Bing-Ming Cheng ◽  
Eh Piew Chew ◽  
Wen-Ching Hung ◽  
Jürg Eberhard ◽  
Yuan-Pern Lee
Keyword(s):  
Atmospheric Chemistry ◽  
Reaction Products ◽  
Gaseous Reaction ◽  
Ionization Energies ◽  
Ionization Region ◽  
Differential Pumping ◽  
Spectrometric System ◽  
First Time ◽  
Sulfur Radicals ◽  
Sulfur Radical

A discharge flow–photoionization mass spectrometric system coupled to a synchrotron is employed to study intermediates and products of sulfur radical reactions related to atmospheric chemistry. Sulfur radicals are generated from reactions of oxygen or chlorine atoms with sulfur compounds in a flow tube. The gaseous reaction products are sampled into the ionization region via a three-stage differential pumping scheme. Photoionization spectra and ionization energies are measured by dispersing synchrotron radiation to ionize the samples. Using this technique, photoionization spectra and ionization energies of HSO, CH3SO, C2H5SO, HSCl, and some secondary reaction products, SSCl, HSSCl, HSSSH, CH3SOH and CH3SS(O)CH3, were measured for the first time.

Odd-Electron-Bonded Sulfur Radical Cations: X-ray Structural Evidence of a Sulfur–Sulfur Three-Electron σ-Bond

2014 ◽  
Vol 136 (42) ◽  
pp. 14666-14669 ◽  
Author(s):  
Senwang Zhang ◽  
Xingyong Wang ◽  
Yunxia Sui ◽  
Xinping Wang
Keyword(s):  
Radical Cations ◽  
X Ray ◽  
Sulfur Radical
Sign in / Sign up

Export Citation Format

Share Document