88-60-8Relevant articles and documents
Alkylation of Phenols with tert-Butanol Catalyzed by H-Form of Y Zeolites with a Hierarchical Porous Structure
Bayguzina,Makhiyanova,Khazipova,Khusnutdinov
, p. 1554 - 1559 (2019/10/14)
tert-Butyl-substituted phenols have been synthesized via the reaction of phenol, o-, m-, and p-cresols with tert-butanol under the action of CBr4-promoted Y-zeolites in the H-form with a hierarchical porous structure.
Dendritic and Core–Shell–Corona Mesoporous Sister Nanospheres from Polymer–Surfactant–Silica Self-Entanglement
Zhang, Kun,Yang, Tai-Qun,Shan, Bing-Qian,Liu, Peng-Cheng,Peng, Bo,Xue, Qing-Song,Yuan, En-Hui,Wu, Peng,Albela, Belén,Bonneviot, Laurent
, p. 478 - 486 (2017/12/13)
Mesoporous nanospheres are highly regarded for their applications in nanomedicine, optical devices, batteries, nanofiltration, and heterogeneous catalysis. In the last field, the dendritic morphology, which favors molecular diffusion, is a very important morphology known for silica, but not yet for carbon. A one-pot, easy, and scalable co-sol–gel route by using the triphasic resol–surfactant–silica system is shown to yield the topologies of dendritic and core–shell–corona mesoporous sister nanospheres by inner radial phase speciation control on a mass-transfer-limited process, depending on the relative polycondensation rates of the resol polymer and silica phases. The trick was the use of polyolamines with different catalytic activities on each hard phase polycondensation. The self-entanglement of phases is produced at the {O?, S+, I?} organic–surfactant–inorganic interface. Mono- and biphasic mesoporous sister nanospheres of carbon and/or silica are derivatized from each mother nanospheres and called “syntaxic” because of similar sizes and mirrored morphologies. Comparing these “false twins”, or yin and yang mesoporous nanospheres, functionalized by sulfonic groups provides evidence of the superiority of the dendritic topologies and the absence of a shell on the diffusion-controlled catalytic alkylation of m-cresol.
Method for preparing hydrocarbyl phenol by catalytic conversion of phenolic compound in presence of molybdenum-based catalyst
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Paragraph 0047; 0070, (2018/04/02)
The invention discloses a method for preparing hydrocarbyl phenol by catalytic conversion of a phenolic compound in the presence of a molybdenum-based catalyst. The method comprises mixing a phenoliccompound, a molybdenum-based catalyst and a reaction solvent, adding the mixture into a sealed reactor, feeding gas into the reactor, heating the mixture to 150-350 DEG C, carrying out stirring for areaction for 0.5-2h, then filtering to remove a solid catalyst and carrying out rotary evaporateion to obtain a liquid product. The phenolic compound has a wide source, a cost is low, product alkyl phenol selectivity is high, an added value is high, alcohol or an alcohol-water mixture is used as a reaction solvent, environmental friendliness is realized, pollution is avoided, any inorganic acids and alkalis are avoided in the reaction process, the common environmental pollution problems in the biomass processing technology are solved, the reaction conditions are mild, the process can be carried out at a low temperature, high-efficiency conversion of the reactants can be realized without consuming hydrogen gas and the method is suitable for large-scale industrial trial production.
Selective oxidative homo-and cross-coupling of phenols with aerobic catalysts
Lee, Young Eun,Cao, Trung,Torruellas, Carilyn,Kozlowski, Marisa C.
supporting information, p. 6782 - 6785 (2014/06/09)
Simple catalysts that use atom-economical oxygen as the terminal oxidant to accomplish selective ortho-ortho, ortho-para, or para-para homo-couplings of phenols are described. In addition, chromium salen catalysts have been discovered as uniquely effective in the cross-coupling of different phenols with high chemo-and regioselectivity.
Ab initio study of the selective alkylation of m-cresol with tert-butanol catalyzed by SO3H-functionalized ionic liquids
Zhou, Jinxia,Liu, Xiumei,Zhang, Shuguang,Mao, Jingbo,Guo, Xinwen
experimental part, p. 232 - 237 (2010/11/03)
Our previous work showed that for catalytic alkylation of m-cresol with tert-butanol (TBA) SO3H-functionalized ionic liquids exhibited several characteristic advantages over conventional catalysts. This work investigated the reaction mechanism of the alkylation of m-cresol with tert-butanol catalyzed by the SO3H-functionalized ionic liquid (IL) through quantum chemical calculation in combination with the experimental studies. The experimental results showed that 2-tert-butyl-5-methyl phenol (2-TBC), 4-tert-butyl-3-methyl phenol (4-TBC) and tert-butyl-m-cresol ether (TBMCE) products were all primary products, while 2,6-di-tert-butyl-3-methyl phenol (2,6-DTBC) was a secondary product. The calculation results indicated that the selectivities of the products depended on the fundamental natures of the reactive sites, including the orbital overlap, the Coulomb and the steric effect in the interaction between the tert-butyl ion ([t-C4H9]+) and the m-cresol; the TBMCE was dynamically favored but not thermodynamically stable, while the C-alkylated products, especially 2-TBC, were the thermodynamically preferred products; the IL played an important role in generating the [t-C4H9]+ from the TBA and the final products from the intermediates.
Synthesis and insecticidal activities and SAR studies of novel benzoheterocyclic diacylhydrazine derivatives
Huang, Zhiqiang,Cui, Quanmin,Xiong, Lixia,Wang, Ziwen,Wang, Kaiyun,Zhao, Qiqi,Bi, Fuchun,Wang, Qingmin
experimental part, p. 2447 - 2456 (2010/05/02)
Two series of novel N′-tert-butyl-N′-substituted benzoyl-N-2,3-dihydrobenzofuran-5-carbohydrazide derivatives were synthesized, their activities and different insecticidal action modes for different Lepidopteral larvicidal assays were evaluated carefully. The results of larvicidal activities against oriental armyworm and mosquito indicate that different benzoheterocyclic analogues of diacylhydrazide have different structure-activity relationships according to the types and patterns of substitution on the benzene, and 3,5-dimethyl is the most efficient substituent for benzoheterocyclic diacylhydrazine. Among them, N′-tert-butyl-N′- (3,5-dimethylbenzoyl)-N-2,4-dimethyl-2,3-dihydrobenzofuran-5-carbo-hydrazide (li) stood out as the best compound with high activity. Compound li and N′-tert-butyl-N′-(3,5-dimethylbenzoyl)-N-5-chloro-6- chromanecarbohydrazide (F) have higher contact activities against diamond-back moth and stomach toxicities against cotton bollworm than ANS-118 and JS-118. Compound F has higher contact toxicity against beet armyworm than ANS-118 and JS-118. These results indicate that different heterocycles and substitutents on the benzene rings of benzoheterocyle moiety not only influence the larvicidal activities strongly but also are very sensitive to the insecticidal action modes for different Lepidopteran larvicidal insects.
Regioselective t-butylation of m-cresol over mesoporous Al-MCM-41 molecular sieves
Umamaheswari,Palanichamy,Arabindoo,Murugesan
, p. 1241 - 1247 (2007/10/03)
Mesoporous Al-MCM-41 molecular sieves (Si/Al = 40, 100, 200) have been synthesised hydrothermally using sodium silicate and aluminium sulphate as the sources for silicon and aluminium, and cetyltrimethylammonium bromide (CTAB) as the structure directing template. They have been characterised by XRD, TGA and FTIR techniques. An intense peak in the XRD patterns at low angle proves the mesoporous nature of these materials. t-Butylation of m-cresol with t-butyl alcohol has been studied over these materials between 250 and 400°C. Reactants feed ratio plays a key role in deciding m-cresol conversion and product selectivity. When m-cresol to t-butyl alcohol mole ratio is set at 1:1, m-cresol conversion is not observed over all the catalysts. However, when the feed ratio is changed to 1:2, m-cresol conversion is more than 30% with the formation of only one ring alkylated product, namely 2-t-butyl-5-methyl phenol. Presuming the zero conversion at the feed ratio 1:1 is due to prevention of adsorption of t-butyl alcohol by m-cresol on the Bronsted acid sites, t-butyl acetate has been tested as the alkylating agent in the place of t-butyl alcohol. Selection of t-butyl acetate as a probe in this alkylation is based on its effectiveness to get in to adsorption better than t-butyl alcohol through its steric free carbonyl as the actual site of adsorption. This ester gives m-cresol conversion at the feed ratio 1:1 thus confirming prevention of adsorption of t-butyl alcohol at the feed ratio 1:1 as the possible cause of nil conversion. The study of time on stream has been carried out to compare the activity of the catalysts and the results are discussed.
Polymerizable antioxidant composition
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, (2008/06/13)
This invention is addressed to antioxidants which are polymerizable using the Ziegler catalyst system. The antioxidant of the present invention has the formula: STR1 wherein R1 and R2 are each aryl groups containing a hindered antioxidant structure imparting antioxidant properties to the compounds. The compounds of the present invention are useful in the polymerization of olefin compounds using Ziegler catalyst systems whereby the antioxidant of the invention becomes chemically bound to the polymer while, at the same time, imparting antioxidant properties thereto.
Selective process for preparting 2,4- or 3,6-di-substituted phenol compounds
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, (2008/06/13)
A selective process for preparing a 2,4- or 3,6-di-substituted phenol compound which comprises reacting an olefin compound of the formula: STR1 wherein R1 is hydrogen, halogen, alkyl, halogen substituted alkyl, aryl, halogen substituted-aryl or alkyl substituted-aryl; and R2, R3 and R4 are the same or different and each is hydrogen, halogen, alkyl, halogen substituted-alkyl or aralkyl; with a phenol compound of the formula: STR2 wherein R5 is hydrogen, hydroxy, halogen, alkyl, halogen substituted-alkyl, alkoxy or --C(R6)(R7)CH(R8)(R9) (wherein R6 is hydrogen, halogen, alkyl, halogen substituted-alkyl, aryl, halogen substituted-aryl or alkyl substituted-aryl; and R7, R8 and R9 are the same or different and each is hydrogen, halogen, alkyl, halogen substituted-alkyl or aralkyl), in the presence of a phosphorus compound and a carboxylic acid compound as catalysts. The methods of the present invention, which is used a phosphorus compound and a carboxylic acid compound as catalysts, are enable to make the separation procedures easy, make the reaction process and time short, not to produce any colored resultant product, and reduce that cost in manufacturing procedures.
The Synthesis and Structure of 3,4-Di-t-butylbenzoic Acid
Hambley, Trevor W.,Sternhell, Sever,Tansey, Charles W.
, p. 807 - 814 (2007/10/02)
3,4-Di-t-butylbenzoic acid (1) was synthesized by a seven-step sequence from 4-t-butylbenzoic acid, and its structure was determined by X-ray diffraction and refined to a residual of 0.065 for 1403 independent observed reflections.The crystals are triclinic, P1, a 6.080(1), b 8.777(1), c 13.912(3) Angstroem, α 80.76(2), β 80.84(2), γ 75.62(2)deg.It is the only example of a simple ortho-di-t-butylbenzene whose structure has been determined.The benzene ring experiences some out-of-plane distortion but, in general, strain is relieved by in-plane bond stretching and angular distortions.
