935-92-2Relevant articles and documents
SHIFF'S BASES IN THE POLYMER MATRIX. COMMUNICATION 2. STRUCTURE AND CATALYTIC PROPERTIES OF Cu(II) COMPLEXES WITH AROMATIC AND HETEROCYCLIC AZOMETHINES IN THE STYRENE-DIVINYLBENZENE COPOLYMER IN OXIDATION OF 2,3,6-TRIMETHYLPHENOL
Skobeleva, V. D.,Men'shikov, S. Yu.,Molochnikov, L. S.,Kolenko, I. P.,Novoselova, A. A.,et al.
, p. 1598 - 1601 (1987)
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Titanium dioxide xerogel modified with powder cellulose in oxidation of trimethylhydroquinone
Shishmakov,Mikushina,Valova,Koryakova,Petrov
, p. 2107 - 2110 (2007)
A procedure was developed for modification of titanium dioxide xerogel by addition of powder cellulose in the stage preceding hydrolysis of tetramethoxytitanium. The resulting catalytic systems based on the new material were studied in a model liquid-phase catalytic process of oxidative dehydrogenation of trimethylhydroquinone with atmospheric oxygen.
An efficient synthesis of 2,3,5-trimethylbenzoquinone by metal-free oxidation of 1,2,4-trimethylbenzene
Yerramreddy, Thirupathi Reddy,Pelton, Egan,Dawson, Karl A,Yiannikouris, Alexandros
, p. 565 - 568 (2019)
The oxidation of 1,2,4-trimethylbenzene with phthaloyl peroxide has been investigated under solvent-free and optimized conditions. 2,3,5-Trimethylbenzoquinone was obtained with great purity in 92% yield at 95% conversion of 1,2,4-trimethylbenzene at 120°C for 2.5 h under solvent-free conditions. The important factors such as the efficiency of the different cyclic acid anhydrides or carboxylic acid peroxides, the concentration of phthalic anhydride and 30% H2O2, the reaction time, the effect of solvent system, and the reaction temperature have been studied. An important advantage of this oxidizing system, aside from the organic solvent-free conditions, is that it is non-toxic, eco-friendly, and inexpensive. In addition, this methodology will be of great use in the preparation of commercially valuable benzoquinones from the corresponding aromatic compounds.
Hierarchical mesoporous TS-1 zeolite: A highly active and extraordinarily stable catalyst for the selective oxidation of 2,3,6-trimethylphenol
Zhou, Jian,Hua, Zile,Cui, Xiangzhi,Ye, Zhengqing,Cui, Fangming,Shi, Jianlin
, p. 4994 - 4996 (2010)
We report the synthesis of a new hierarchical mesoporous TS-1 type zeolite by a simple steam-assisted crystallization method. This novel product exhibits high catalytic activity and a strongly prolonged lifetime in the selective oxidation of 2,3,6-trimethylphenol to trimethyl-p-benzoquinone.
Efficient oxidation of 2,3,6-trimethyl phenol using non- exchanged and H+ exchanged manganese oxide octahedral molecular sieves (K-OMS-2 and H-K-OMS-2) as catalysts
Opembe, Naftali N.,King'Ondu, Cecil K.,Suib, Steven L.
, p. 427 - 432 (2012)
A new and efficient oxidation process of 2,3,6- trimethyl phenol to 2,3,6-trimethyl benzoquinone (TMQ) is reported forthwith using non-exchanged and H+-exchanged manganese oxide octahedral molecular sieves (K-OMS-2 and H-K-OMS-2) as benign catalysts. The oxidation reaction is efficiently carried out using TBHP as oxidant and with catalytic amounts of OMS-2 achieving >95% conversion with excellent selectivity (~99%) to TMQ in 30 min. Springer Science+Business Media, LLC 2012.
CATALYTICAL PROPERTIES OF POLYVANADOMOLYBDIC ACIDS IN OXIDATION OF 1,2,4-TRIMETHYLBENZENE BY PERACETIC ACID
Petrov, L. A.,Lobanova, N. P.,Volkov, V. L:,Zakharova, G. S.,Kolenko, I. P.,Buldakova, L. Yu.
, p. 1806 - 1808 (1989)
Polyvanadomolybdic acids catalyze the process of peracid oxidation of 1,2,4-trimethylbenzene.The selectivity with respect to 2,3,5-trimethyl-1,4-benzoquinone increases with increasing degree of replacement of vanadium atoms in the PVMA by molybdenum; this is related to increased stability of the intermediate peroxides of the heteropolyvanadates.
Oxidative dehydrogenation of 2,3,5-trimethyl-1,4-hydroquinone in the presence of titanium dioxide hydrogel
Kharchuk,Buldakova,Shishmakov,Kuznetsova,Kovaleva,Koryakova,Molochnikov,Yanchenko,Petrov
, p. 101 - 104 (2004)
Liquid-phase oxidative dehydrogenation of 2,3,5-trimethyl-1,4-hydroquinone in the presence of titanium dioxide hydrogel was studied by a kinetic method. Associative interactions between the substrate, oxidant, and gel were detected by voltammetry and ESR and IR spectroscopy.
Kornfeld,Weissberger
, p. 360 (1939)
The efficient catalytic oxidation of 2,3,6-trimethylphenol with air over composite catalyst to synthesize Vitamin E intermediate
Zhang, Tianyong,Song, Yuxin,Yang, Yang,Li, Bin,Jiang, Shuang
, p. 3705 - 3718 (2021/06/23)
2,3,5-Trimethylbenzoquinone (TMBQ)is a kind of crucial intermediate in the synthesis of Vitamin E, whose demand is increasing rapidly. The traditional synthesis method of TMBQ needs H2O2 or pure O2 as the oxidant, which is expensive and needs much attention in the production, transportation and storage process. In order to overcome the issues, the green oxidant, air, has been developed in this work to prepare TMBQ for the first time. TMBQ was synthesized from 2,3,6-trimethylphenol (TMP) with the oxidant of air in the solvent of isoamylol catalyzed by composite catalyst of inorganic salts at one atmosphere pressure. The critical reaction parameters, including the ingredient of composite catalyst, reaction time, reaction temperature, stirring speed and the addition of ionic liquids were investigated in order to achieve the optimal reaction condition. TMBQ was obtained with the conversion of 100% and selectivity of 96.7% at 90?°C for 7–8?h at one atmosphere pressure, over the composite catalyst, the aqueous solution of CuCl2, FeCl3 and MgCl2, with the help of ion liquid, 1-sulfobutyl-3-methylimidazole hydrochloride ([Bmim]Cl). Moreover, the catalyst could be recycled more than four times. Air is very cheap, abundant, eco-friendly and safe in production, transportation and storage process. The synthesis of TMBQ from TMP with air as oxidant at one atmosphere pressure has obvious advantages, which will bring new inspiration for the industrial production of TMBQ. Graphic abstract: [Figure not available: see fulltext.].
Organophotocatalytic Aerobic Oxygenation of Phenols in a Visible-Light Continuous-Flow Photoreactor
Wellauer, Jo?l,Miladinov, Dragan,Buchholz, Thomas,Schütz, Jan,Stemmler, René T.,Medlock, Jonathan A.,Bonrath, Werner,Sparr, Christof
supporting information, p. 9748 - 9752 (2021/05/27)
A mild photocatalytic phenol oxygenation enabled by a continuous-flow photoreactor using visible light and pressurized air is described herein. Products for wide-ranging applications, including the synthesis of vitamins, were obtained in high yields by precisely controlling principal process parameters. The reactor design permits low organophotocatalyst loadings to generate singlet oxygen. It is anticipated that the efficient aerobic phenol oxygenation to benzoquinones and p-quinols contributes to sustainable synthesis.