809-73-4Relevant academic research and scientific papers
Liquid-Phase Oxidation of Inorganic Sulfides in Aqueous Media in the Presence of a Homogeneous Catalyst Based on 3,3′,5,5′-Tetra-tert-Butyl-4,4′-Stilbenequinone
Hoang,Akhmadullin,Akhmadullina, F. Yu.,Zakirov,Akhmadullina
, p. 256 - 261 (2018)
The rates and factors influencing the rates of liquid-phase oxidation of inorganic sulfides by oxygen in aqueous media in the presence of a homogeneous catalyst based on 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone dissolved in the kerosene fraction ha
Isolation and identification of 3,3',5,5'-tetrabis(tert-butyl)stilbenequinone from polyethylene closures containing titanium dioxide and butylated hydroxytoluene
Jagnandan,Daun,Ambrosio,Gilbert
, p. 916 - 917 (1979)
A yellow compound was isolated from commercially available, discolored, polyethylene ophthalmic closures containing titanium dioxide and butylated hydroxytoluene (I). This compound was present at 7.46 ppm (w/w). It was identified by UV, IR, and mass spectra as 3,3',5,5'-tetrabis (tert-butyl)stilbenequinone (II), a dimer of I. Further structural confirmation was obtained by NMR. Formation of II is catalyzed by titanium dioxide.
New data on the reaction of diethyl hydrogen phosphite with 3,5-di-tert-butyl-4-hydroxybenzaldehyde
Ismagilov,Moskva,Mosunova,Romakhin
, p. 1547 - 1549 (2001)
3,3′,5,5′-Tetra-tert-butylstilbene quinone and 1,2-bis(3,5-di-tert-butyl-4-hydroxyphenyl)-1,2-bis-(diethoxyphosphinoyl)-ethane were isolated from a mixture of products of the reaction of equivalent amounts of diethyl hydrogen phosphite and 3,5-di-tert-butyl-4-hydroxybenzaldehyde. A scheme of chemical transformations in this reaction system was offered.
TEMPO-Mediated Cross-Dehydrogenative Coupling of Indoles and Imidazo[1,2- a]pyridines with Fluorinated Alcohols
Nipate, Dhananjay S.,Jaspal, Sonam,Shinde, Vikki N.,Rangan, Krishnan,Kumar, Anil
supporting information, p. 1373 - 1377 (2021/02/20)
A simple and highly efficient metal-free method has been developed for hydroxyfluoroalkylation of indoles and imidazo[1,2-a]pyridines via TEMPO-mediated C(sp3)-H and C(sp2)-H bond cross-dehydrogenative coupling of fluorinated alcohols and indoles. The protocol showed broad substrate scope, afforded good yields of hydroxyfluoroalkylated products, and was amenable for scale-up. Mechanistic investigation indicated involvement of the radical pathway.
Synthesis of 3,3′,5,5′-Tetra-tert-butyl-4,4′-stilbenequinone and Its Catalytic Activity in the Liquid-Phase Oxidation of Inorganic Sulfides
Hoang,Akhmadullin,Akhmadullina, F. Yu.,Zakirov,Akhmadullina,Gazizov
, p. 1008 - 1013 (2018/09/12)
The oxidation of 2,6-di-tert-butyl-4-methylphenol with hydrogen peroxide in the presence of potassium iodide gave 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone which catalyzed liquid-phase oxidation of sodium sulfide with oxygen more efficiently than di
Investigation of 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone-based catalyst in the reaction of liquid-phase oxidation of inorganic sulfides
Hoang, Hien Y.,Akhmadullin, Renat Maratovich,Akhmadullina, Farida Yunusovna,Zakirov, Rustem Kayumovich,Bui, Dinh Nhi,Akhmadullina, Alfiia Garipova,Gazizov, Almir Sabirovich
, p. 130 - 139 (2017/11/16)
In this paper, the intermediate and final reaction products of catalytic oxidation of inorganic sulfides in the presence of oxygen dissolved in the kerosene fraction and 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone were investigated. The thiosulfate and sulfate are major products of the oxidation of sodium sulfide under these conditions. The intermediate and final products in the catalytic oxidation of sulfide sulfur do not affect the rate of its oxidation. The yield of catalytic oxidation products depends on the nature of the sulfide and on the pH of the solution. The catalytic cycle for sulfide oxidation in the presence of 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone is shown. The role of 3,3′,5,5′-tetra-tert-butyl-4,4′-stilbenequinone is to create a new and a more effective way of electron transfer from the reducing agent (sulfide) to the oxidant (oxygen).
Reaction of esters of PIII acids with 2,6-di-tert-butyl-4-chloromethylidenecyclohexa-2,5-dienone
Gazizov,Ismagilov,Shamsutdinova,Tarakanova,Karimova
, p. 2943 - 2947 (2017/06/05)
A reaction of PIII acid esters with 2,6-di-tert-butyl-4-chloromethylidenecyclohexa-2,5-dienone leads to the formation of phosphorylated phosphorus ylides, 3,3’,5,5’-tetra-tert-butylstilbenequinone, and diphosphorylated sterically hindered phenols. The schemes for the formation of these products through the primary key intermediates of betaine and phosphorus ylide structures were suggested.
Metal-free C-H amination for indole synthesis
Jang, Young Ho,Youn, So Won
supporting information, p. 3720 - 3723 (2014/08/05)
An effective metal-free C-H amination of N-Ts-2-alkenylanilines by using DDQ as an oxidant has been developed to afford a diverse range of substituted indoles. This protocol is operationally simple and robust, obviates the need of expensive transition-metal catalysts, and offers a broad substrate scope. A mechanism involving a radical cation generated by SET and a migratorial process via a phenonium ion intermediate is proposed.
Study of the reaction of 4-chloromethylene-2,6-di-tert-butylcyclohexa-2,5- dien-1-one with the P(III) acids esters
Gazizov,Ismagilov,Shamsutdinova,Karimova,Sinyashin
experimental part, p. 212 - 216 (2012/07/02)
The main stable products of the reactions 4-chloromethylene-2,6-di-tert- butylcyclohexa-2,5-dien-1- one with triethyl phosphite and ethyl diphenylphosphinite are the phosphorylated phosphorus ylides, 3,3′,5,5′-tetra-tert-butylstilbenequinone, and biphosph
Coupling and fast decarboxylation of aryloxyl radicals of 4-hydroxycinnamic acids with formation of stable p-quinomethanes
Daquino, Carmelo,Foti, Mario C.
, p. 1536 - 1547 (2007/10/03)
The reaction at room temperature of 3,5-di-tert-butyl- and 3,5-di-methoxy-4-hydroxycinnamic acids 1 and 2 with the dpph. radical in acetone or other non-hydroxylic polar solvents yields interesting dimeric p-quinomethanes 10-16 characterized by
