cas 499-49-0, 5-Methylisophthalic acid | Articles data

Articles about 499-49-0Total 8 be found

Method for preparing benzene carboxylic acid through liquid-phase oxidation of methyl-substituted benzene
The invention discloses a method for preparing benzene carboxylic acid through liquid-phase oxidation of methyl-substituted benzene. The method comprises the following step: oxidizing methyl-substituted benzene by using tert-butyl hydroperoxide and oxygen in a liquid-phase system to prepare benzene carboxylic acid. According to the invention, tert-butyl hydroperoxide and oxygen are used as oxidants together, methyl-substituted benzene can be oxidized into benzene carboxylic acid without adding a catalyst, the conversion rate of raw materials is high, product selectivity is high, technologicalprocess is simple, production cost is low, and the method is environmentally friendly.
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Paragraph 0135-0139

(2021/02/06)

Surveying Iron-Organic Framework TAL-1-Derived Materials in Ligandless Heterogeneous Oxidative Catalytic Transformations of Alkylarenes
The use of carbonized materials derived from metal-organic frameworks (MOFs) in catalytic organic transformations is less well explored than is the use of MOFs. Here, we survey the oxidative performance of heterogeneous catalyst materials derived from the polycrystalline iron-organic framework TAL-1.
Alam, Mahboob,J?rving, Ivar,K??rik, Maike,Kongi, Nade?da,Leis, Jaan,Ping, Kefeng,Starkov, Pavel
supporting information
p. 1536 - 1540
(2019/08/07)

Inclusion complex containing epoxy resin composition for semiconductor encapsulation
The invention is an epoxy resin composition for sealing a semiconductor, including (A) an epoxy resin and (B) a clathrate complex. The clathrate complex is one of (b1) an aromatic carboxylic acid compound, and (b2) at least one imidazole compound represented by formula (II): wherein R2 represents a hydrogen atom, C1-C10 alkyl group, phenyl group, benzyl group or cyanoethyl group, and R3 to R5 represent a hydrogen atom, nitro group, halogen atom, C1-C20 alkyl group, phenyl group, benzyl group, hydroxymethyl group or C1-C20 acyl group. The composition has improved storage stability, retains flowability when sealing, and achieves an effective curing rate applicable for sealing delicate semiconductors.
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(2014/03/21)

Aerobic oxidation of trimethylbenzenes catalyzed by N,N′,N″-trihydroxyisocyanuric acid (THICA) as a key catalyst
The oxidation of trimethylbenzenes was examined with air or O2 using N,N′,N″-trihydroxyisocyanuric acid (THICA) as a key catalyst. Thus, 1,2,3-, 1,2,4-, and 1,3,5-trimethylbenzenes under air (20 atm) in the presence of THICA (5 mol %), Co(OAc)2 (0.5 mol %), Mn(OAc)2, and ZrO(OAc)2 at 150 °C were oxidized to the corresponding benzenetricarboxylic acids in good yields (81-97%). In the aerobic oxidation of 1,2,4-trimethylbenzene by the THICA/Co(II)/Mn(II) system, remarkable acceleration was observed by adding a very small amount of ZrO(OAc)2 to the reaction system to form 1,2,4-benzenetricarboxylic acid in excellent yield (97%). In contrast, no considerable addition effect was observed in the oxidation of 1,3,5-trimethylbenzene. This aerobic oxidation by the present catalytic system provides an economical and environmentally benign direct method to benzenetricarboxylic acids, which are very important polymer materials.
Hirai, Naruhisa,Tatsukawa, Yoshinobu,Kameda, Michiko,Sakaguchi, Satoshi,Ishii, Yasutaka
p. 6695 - 6699
(2007/10/03)

Cr-MCM-41-Catalyzed selective oxidation of alkylarenes with TBHP
A mild and efficient catalytic method for benzylic oxidation of alkylarenes to the correspondxinxg carbonyl compounds in good yields is described using a catalytic amount of reusable solid, mesoporous chromosilicate (Cr-MCM-41) and 70% tert-butyl hydroperoxide (TBHP) as oxidant.
Das,Chaudhari,Nandanan,Chandwadkar,Sudalai,Ravindranathan,Sivasanker
p. 3631 - 3634
(2007/10/03)

On the 2,3,6-Triacetyl-5-ethyltoluene and 2,3,5,6-Tetraacetyltoluene
2,3,6-Triacetyl-5-ethyl-toluene and 2,3,5,6-tetraacetyl-toluene were prepared by permanganate oxidation of 2,6-diacetyl-3,5-diethyl-toluene.NMR and MS data are given. - Key words: o-Diacetyl Derivatives, Amino Acid Analysis, Polyacetyl-toluenes, Permanganat Oxidation, Polyacetyl-ethyl-toluenes
Riemschneider, R.,Hennig, K.
p. 835 - 838
(2007/10/02)

INFLUENCE OF NITROGEN LIGANDS ON SYNERGIC EFFECT OF METAL CATALYSTS IN OXYDATION OF ALKYLAROMATIC COMPOUNDS
Synergic effect of metal mixtures Co-Mn, Co-Ce and Co-U in oxidation of 1,2,4- and 1,3,5-trimethylbenzenes dissolved in acetic acid has been studied in dependence of the presence of nitrogen ligands 2,2',2''-nitrilotrisethanol, 1,6-hexanediamine and pyridine.The complex CoBr2Py2 and its equimolar mixture with the complex MnBr2Py2 are highly active in oxidation of alkylaromatic derivatives containing other alkyl than methyl.Their activity has been tested experimentally in oxidations of ethylbenzene, 1,3- and 1,2-dimethylbenzenes, 1-ethyl-4-methylbenzene, (1-methylethyl)benzene, propylbenzene, 1-methyl-4-(1-methylethyl)benzene, dodecylbenzene, 1,3-diethylbenzene and 4-octyl-1,1'-biphenyl
Hronec, Milan,Holotik, Stefan,Ilavsky, Jan
p. 880 - 887
(2007/10/02)

STUDY OF STRUCTURE AND ACTIVITY OF COBALT BROMIDE COMPLEXES IN THE OXIDATION OF ALKYLAROMATIC HYDROCARBONS
Catalytic activity of tetrabromocobalt(II) complexes and halo complexes of the type CoX2L2 respectively with ligands involving as donor atom, nitrogen, sulphur, phosphorus, arsenic, or antimony was studied in oxidation of alkylaromatic hydrocarbons.The participitation of the nitrogen compounds in the complex formation and in the elementary reaction stages was investigated.Highly catalytically active are tetrahedral complexes of the type CoBr4(2-) and (CoBr3OAc)(2-).Triethanolamine-coordinated cobalt bromide and chloride complexes react in acetic acid or its anhydride with oxygen, the triethanolamine ligand being oxidized as well.In addition to their participitation in the cobalt complex formation, nitrogen compounds influence the recovery of the active forms of the catalyst; they do not, however, affect the rate of dehalogenation of organic bromides.
Hronec, Milan
p. 1555 - 1566
(2007/10/02)