Results 121 to 130 of about 946 (177)

Electron-acceptor effect of aminoxyl radicals

Journal of the Chemical Society, Perkin Transactions 2, 1991
Acidic properties of several compounds with aminoxyl-based spin labels were found to be abnormally strong when compared with those of diamagnetic analogues. Analysis of this phenomenon in terms of both Taft constants and Hinze–Jaffe–Huheey group electronegativities enabled us to attribute it to the strong electron-acceptor effect of the aminoxyl group ...
Vitalii Yu. Nagy, Oleg M. Petrukhin, Yurii A. Zolotov, Leonid B. Volodarskii   +3 more
openaire   +1 more source

Aminoxyl Radicals on the Silicon (001) Surface

The Journal of Physical Chemistry C, 2008
Aminoxyl radicals form a class of persistent radical species of which the TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy) molecule is perhaps the best known. They are known to be dangling bond scavengers and bind readily to the silicon (001) surface. However, the possibility of the aminoxyl group reacting dissociatively with the surface has been largely ...
Bennett, J., Warschkow, O., Marks, Nigel
openaire   +2 more sources

Reactions of a Stable Phosphinyl Radical with Stable Aminoxyl Radicals

Chemistry Letters, 2015
Abstract Reaction of stable phosphinyl radical 1a with AZADO gave aminoxyphosphine 3 as the primary product by selective radical coupling at −40 °C. Compound 3 decomposed to phosphorane 4, silyl phosphinate 5, and aminophosphine 6 at room temperature. The molecular structures of 4–6 were determined by X-ray structural analysis.
Shintaro Ishida, Fumiya Hirakawa, Takeaki Iwamoto   +2 more
openaire   +1 more source

Quinolinic Aminoxyl Protects Albumin Against Peroxyl Radical Mediated Damage

Free Radical Research, 1994
A study of peroxyl radical-mediated bovine serum albumin oxidation in the presence of the quinolinic aminoxyl 1,2-dihydro-2,2-diphenyl-4-ethoxy-quinoline-1-oxyl (QAO) was carried out in order to test its efficiency as a protein antioxidant. Albumin oxidation was induced by the tert-butylhydroperoxide/PbO2 system.
F, Tanfani, P, Carloni, E, Damiani, L, Greci, M, Wozniak, D, Kulawiak, K, Jankowski, J, Kaczor, A, Matuszkiewics   +8 more
openaire   +2 more sources

Aminoxylation of Thioalkynes through Radical-Polar Crossover

Synlett, 2019
A one-pot procedure for the aminoxylation of thioalkynes for the direct formation of α-functionalized thioesters under mild reaction conditions is reported. A ketenethionium ion is the key intermediate, which is generated in situ by Brønsted acid mediated protonation and undergoes a radical-polar crossover.
Giovanni Di Mauro, Martina Drescher, Sara Tkaczyk, Nuno Maulide   +3 more
openaire   +2 more sources

Force Field Calculations on Five Membered Ring Aminoxyl Radicals

Free Radical Research Communications, 1993
Two force fields (MM2 and Genmol) have been applied to the modeling of five membered ring aminoxyl radicals. For the six molecules which were investigated the geometry of the conformation with the lowest strain energy was in very good agreement with the X-ray geometry.
F, Vila, P, Tordo, D, Siri, G, Pèpe
openaire   +2 more sources

Oxidation of amides by laccase-generated aminoxyl radicals

Journal of Molecular Catalysis B: Enzymatic, 2008
Abstract The enzyme laccase from the fungus Trametes villosa catalyses the oxidation of two hydroxylamines ( NO H), i.e., HPI (N-hydroxy-phthalimide) and HBT (1-hydroxy-benzotriazole), into their corresponding aminoxyl radicals ( NO ) PINO and BTNO. The ensuing oxidation of a few amides and lactames by PINO and BTNO has been investigated in buffered ...
Alessandra Coniglio, GALLI, Carlo, GENTILI, Patrizia, VADALA', RAFFAELLA   +3 more
openaire   +4 more sources

ChemInform Abstract: Electron‐Acceptor Effect of Aminoxyl Radicals.

ChemInform, 1991
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
V. YU. NAGY, O. M. PETRUKHIN, Y. A. ZOLOTOV, L. B. VOLODARSKII   +3 more
openaire   +1 more source

Aminoxyl Radicals as MRI Contrast Agents

1992
Aminoxyl radicals have been suggested as potential MRI contrast agents for the last 10 years (1) but no clinically accepted examples for human applications have been approved to date. The following questions appear to need evaluation: (a) advantages of aminoxyl radicals as contrast agents in comparison to other chemical agents currently available; (b ...
Edward G. Janzen, Rheal A. Towner
openaire   +1 more source

Action of quinolinic and indolinonic aminoxyls as radical-scavenging antioxidants

Chemistry and Physics of Lipids, 1999
The kinetic studies on the actions of quinolinic and indolinonic aminoxyls in the oxidation of lipid peroxidation induced by free radicals were carried out to evaluate their antioxidant activity. These aminoxyls showed a similar reactivity toward peroxyl radical with alpha-tocopherol.
N, Noguchi, E, Damiani, L, Greci, E, Niki   +3 more
openaire   +2 more sources