95407-69-5Relevant academic research and scientific papers
Convenient Synthesis of Bis-1,3-dithiolium Salts by One-electron Oxidation of Tetrathiafulvalene with Oxoaminium Salts
Yoshida, Eri,Takata, Toshikazu,Endo, Takeshi,Ishizone, Takashi,Hirao, Akira,Nakahama, Seiichi
, p. 1827 - 1828 (1994)
Several bis-1,3-dithiolium salts, radical cation salts of tetrathiafulvalene were synthesized in quantitative yields by oxidation of tetrathiafulvalene with oxoaminium salts for 1 min at room temperature.
Nickel-Catalyzed Aminoxylation of Inert Aliphatic C(sp3)-H Bonds with Stable Nitroxyl Radicals under Air: One-Pot Route to α-Formyl Acid Derivatives
Wang, Chunxia,Zhang, Luoqiang,You, Jingsong
supporting information, p. 1690 - 1693 (2017/04/11)
Nickel-catalyzed aminoxylation of an unactivated C(sp3)-H bond with a stable nitroxyl radical has been accomplished for the first time to offer various N-alkoxyamine derivatives, which further enables a one-pot approach to α-formyl acid derivatives. The aminoxylation process reported also provides direct evidence for the oxidative addition of a cyclometallic intermediate with a free radical, which is helpful for the reaction-mechanism study in transition-metal-catalyzed functionalization of inert C(sp3)-H bonds.
Kinetics and thermodynamics of reversible disproportionation-comproportionation in redox triad oxoammonium cations - Nitroxyl radicals - Hydroxylamines
Sen, Vasily D.,Tikhonov, Ivan V.,Borodin, Leonid I.,Pliss, Evgeny M.,Golubev, Valery A.,Syroeshkin, Mikhail A.,Rusakov, Alexander I.
, p. 17 - 24 (2015/03/03)
Kinetics and equilibrium of the acid-catalyzed disproportionation of cyclic nitroxyl radicals R2NO· to oxoammonium cations R2NO+ and hydroxylamines R2NOH is defined by redox and acid-base properties of these compounds. In a recent work (J. Phys. Org. Chem. 2014, 27, 114-120), we showed that the kinetic stability of R2NO· in acidic media depends on the basicity of the nitroxyl group. Here, we examined the kinetics of the reverse comproportionation reaction of R2NO+ and R2NOH to R2NO· and found that increasing in -I-effects of substituents greatly reduces the overall equilibrium constant of the reaction K4. This occurs because of both the increase of acidity constants of hydroxyammonium cations K3H+ and the difference between the reduction potentials of oxoammonium cations ER2NO+/R2NO· and nitroxyl radicals ER2NO·/R2NOH. pH dependences of reduction potentials of nitroxyl radicals to hydroxylamines E1/3σ and bond dissociation energies D(O-H) for hydroxylamines R2NOH inwater were determined. For a wide variety of piperidine- and pyrrolidine-1-oxyls values of pK3H+ and ER2NO+/R2NO· correlate with each other, as well aswith the equilibriumconstants K4 and the inductive substituent constants ωI. The correlations obtained allowprediction of the acid-base and redox characteristics of redox triads R2NO·-R2NO+-R2NOH.
Synthesis, crystal structure and fluorescence behavior of 2,6-Di(thiophen-2-yl)-benzo[1,2-d:4,5-d']bisoxazole
Chai, Lan-Qin,Zhang, Yu-Li,Tong, Jun-Feng,Liu, Gang
, p. 239 - 244 (2013/05/22)
An effective and clean new aerobic approach for the synthesis of 2,6-disubstituted benzobisoxazole by using a one-pot reaction of an organic aminoxyl radical as the catalyst is reported. 2,6- Di(thiophen-2-yl)-benzo[1,2-d : 4,5-d]bisoxazole was synthesized with catalysis by the free radical 4-methoxy-TEMPO and characterized by 1H and 13C NMR spectroscopy, HRMS, as well as by elemental analysis, UV/Vis and emission spectroscopy. The crystal structure of the title compound has been determined by single-crystal X-ray diffraction. It crystallizes in the monoclinic space groupC2/c with a=12.531(1), b=3.8960(2), c = 28.733(2) A, β = 100:760(1), Z = 4. Through intermolecular weak C-H O hydrogen bonding and p-p stacking interactions, a supramolecular 3D structure is formed.
Nitroxyl radical plus hydroxylamine pseudo self-exchange reactions: Tunneling in hydrogen atom transfer
Wu, Adam,Mader, Elizabeth A.,Datta, Ayan,Hrovat, David A.,Borden, Weston Thatcher,Mayer, James M.
supporting information; scheme or table, p. 11985 - 11997 (2009/12/08)
Bimolecular rate constants have been measured for reactions that involve hydrogen atom transfer (HAT) from hydroxylamines to nitroxyl radicals, using the stable radicals TEMPO· (2,2,6,6-tetramethylpiperidine-1-oxyl radical), 4-oxo-TEMPO·/
