40908-37-0Relevant academic research and scientific papers
Synthesis and fluorescence properties of six fluorescein-nitroxide radical hybrid-compounds
Sato, Shingo,Endo, Susumu,Kurokawa, Yusuke,Yamaguchi, Masaki,Nagai, Akio,Ito, Tomohiro,Ogata, Tateaki
supporting information, p. 66 - 71 (2016/07/06)
Six fluorescein-nitroxide radical hybrid-compounds (2ab, 3ab, 4, and 5) were synthesized by the condensation of 5- or 6-carboxy-fluorescein and 4-amino-TEMPO (2ab), 5- or 6-aminofluorescein and 4-carboxy-TEMPO (3ab), and fluorescein and 4-carboxy-TEMPO (4), or by reaction of the 3-hydroxyl group of fluorescein with DPROXYL-3-ylmethyl methanesulfonate (5). Fluorescence intensities (around 520 nm) after reduction of the radical increased to 1.43-, 1.38-, and 1.61-folds for 2a, 2b and 3b respectively; 3a alone exhibited a decrease in intensity on reduction. Since 4 was readily solvolyzed in PBS or even methanol to afford fluorescein and 4-carboxy-TEMPO, its fluorescence change could not be measured. Hybrid compound 5 containing an ether-linkage between the fluorescein phenol and 3-hydroxymethyl-DPROXYL hydroxyl centers, was stable and on reduction, showed a maximum increase (3.21-fold) in relative fluorescence intensity in PBS (pH 5.0), despite its remarkably low absolute fluorescence intensity.
A revised preparation of (4-Acetamido-2,2,6,6-tetramethylpiperidin-1-yl) oxyl and 4-acetamido-2,2,6,6-tetramethyl-1-oxopiperidinium tetrafluoroborate: Reagents for stoichiometric oxidations of alcohols
Tilley, Leon J.,Bobbitt, James M.,Murray, Stephanie A.,Camire, Casey E.,Eddy, Nicholas A.
, p. 326 - 329 (2013/03/14)
Revised preparations of (4-acetamido-2,2,6,6-tetramethylpiperidin-1-yl)oxyl and the corresponding oxoammonium salt, 4-acetamido-2,2,6,6-tetramethyl-1- oxoammonium tetrafluoroborate are presented together with some of the important properties of these two oxidizing reagents. Georg Thieme Verlag Stuttgart New York.
Reactions of nitroxides. Part X: Antifungal activity of selected sulfur and selenium derivatives of 2,2,6,6-tetramethylpiperidine
Zakrzewski, Jerzy,Krawczyk, Maria
scheme or table, p. 514 - 516 (2011/02/28)
The antifungal activity of nitroxyl radicals - derivatives of 2,2,6,6-tetramethylpiperidine-1-oxyl with reactive substituents 4-isothiocyanato-, 4-isocyano-, and 4-isoselenocyanato- and of N-formyl-, N-thioformyl-, N-selenoformyl-derivatives of 2,2,6,6-tetramethylpiperidine was investigated. Those of the above compounds, which contain a sulfur or selenium atom are the most active against four fungus plant patogens: Botrytis cinerea, Fusarium culmorum, Phytophthora cactorum, Rhizoctonia solani. 4-Isoselenocyanato-2,2,6,6-tetramethylpiperidine-1-oxyl proved to be the most active compound.
Synthesis of 2,2,6,6-tetramethylpiperidine derivatives
Kashparova,Kagan,Kashparov,Zhukova
, p. 667 - 668 (2007/10/03)
Diazotization of 4-amino-2,2,6,6-tetramethylpiperidine in acetic or sulfuric acid affords 2,2,6,6-tetramethyl-1,2,3,6-tetrahydropyridine in high yield. Under the same conditions, the corresponding nitroxyl radical transforms into 4-hydroxy-2,2,6,6-tetrame
Acetylation of sterically hindered diamines
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, (2008/06/13)
A process for acetylating diamines having a sterically hindered amino function and a further, sterically unhindered amino function where the acetylation takes place at the sterically unhindered amino function is provided comprises reacting the diamine with ketene. A preferred diamine is 4-amino-2,2,6,6-tetramethylpiperidine (TAD).
Non-migrating 1-hydrocarbyloxy hindered amine derivatives as polymer stabilizers
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, (2008/06/13)
1-Hydrocarbyloxy substituted hindered amine compounds which also contain a reactive functional group such as hydroxy, amino, oxirane or carboxyl can be chemically attached to selected polymer substrates by condensation reactions to give polymers containing a chemically-bonded, non-migrating stabilizer having excellent stabilization efficacy for protecting said polymer substrate from the adverse effects of actinic light.
Synthesis of alpha- and beta-glycosides containing spin labels, as probes for studies of carbohydrate-protein interaction.
Plessas,Goldstein
, p. 211 - 220 (2007/10/02)
Nitroxide spin-labeled alpha-D-glycopyranosides were synthesized in good yield and in a highly stereoselective manner by reaction of per-O-benzyl-alpha-D-glycopyranosyl bromides with 2,2,6,6-tetramethyl-4-piperidinol under the bromide ion-catalyzed conditions devised by Lemieux et al. After hydrogenolysis, the deblocked intermediates were oxidized to give the desired, spin-labeled alpha-D-glycopyranosides. Nitroxide spin-labeled beta-D-glycopyranosides, as well as a beta-maltoside, were synthesized by standard methods. The synthesis is also described of 2-amino-2-deoxy-D-glucose and -D-galactose derivatives having a spin label at C-2, and of the spin-labeled compound 1-[4-(beta-D-galactopyranosyloxy)phenyl]-3-(2,2,6,6-tetramethylpiperidin-1-oxyl -4-yl)-2-thiourea.
