119-47-1Relevant articles and documents
Regiospecific, one-pot, and pseudo-five-component synthesis of 6,6′-(arylmethylene)bis(2-(tert -butyl)4-methylphenol) antioxidants using highly sulfonated multi-walled carbon nanotubes under solvent-free conditions
Fareghi-Alamdari, Reza,Golestanzadeh, Mohsen,Agend, Farima,Zekri, Negar
, p. 982 - 991 (2013)
This is the first report of an innovative, one-pot, pseudo-five-component, and solvent-free synthesis of 6,6′-(arylmethylene)bis(2-(tert-butyl)4- methylphenol) antioxidants from p-cresol, methyl tert-butyl ether, and aldehydes in the presence of sulfonate
Experimental and theoretical investigations of the antioxidant activity of 2,2′-methylenebis(4,6-dialkylphenol) compounds
Al Zoubi, Wail,Karabet, Fran?ois,Al Bandakji, Rana,Hussein, Khansaa
, (2017)
The antioxidant activity of two primary antioxidants, 2,2′-methylenebis(4-methyl-6-tert-butylphenol) (MMBPH2) and 2,2′-methylenebis(4,6-di-tert-butylphenol) (MDBPH2), has been studied using the 1,1-diphenyl-2-picrylhydrazyl (DPPH) method. The synthesized compounds have been successfully characterized systematically using elemental analyses, infrared, 1H NMR and 13C NMR spectra and GC–MS. Importantly, it has been found that the compound MMBPH2 in particular is more active in DPPH radical scavenging. In addition, density functional theory calculations (B3LYP) have been used to predict the antioxidant activity and predict structural geometries of the compounds in the gas phase.
Trialkylamine controlled phenol-for maldehyde reaction over clay catalysts: Selective and environmentally benign synthesis of salicylic aldehydes
Bigi, Franca,Conforti, Maria Lina,Maggi, Raimondo,Sartori, Giovanni
, p. 2709 - 2712 (2000)
Substituted salicylic aldehydes 6 are synthesised in good yields and excellent selectivities by reaction of phenols 1 with formaldehyde 2 over montmorillonite KSF-Et3N as a heterogeneous and reusable catalyst. (C) 2000 Elsevier Science Ltd.
Exploiting the photocatalytic activity of TiO2towards the depolymerization of Kraft lignin
Crites, Charles-Oneil L.,Gomes de Mendon?a, Fernanda,Netto-Ferreira, José Carlos,Baker, R. Tom,Hallett-Tapley, Geniece L.,Tremblay, Luc
, p. 15371 - 15377 (2021)
Lignin is a promising renewable source of aromatic chemicals. Described herein is a new photocatalytic methodology for depolymerization of oxidized Kraft lignin to industrially relevant aromatic platform chemicals. The photooxidation route begins with oxidation of alcohol moieties using a gold nanoparticle/hydrotalcite composite. Next, the oxidized lignin is subjected to UVA irradiation in the presence of TiO2, leading to a 3-fold decrease of its molecular weight and to the formation of various monolignols. The products obtained in both steps were characterized using FTIR, SEC, GC-MS, and 2D NMR spectroscopy, which confirm the depolymerization of lignin to smaller molecular weight products. This method offers both energetic and chemical advantages over thermochemical processing for lignin valorisation.
Based on mixed alkali catalyst catalytic double-phenolic antioxidant preparation method and application (by machine translation)
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Paragraph 0050; 0051, (2017/03/08)
The invention discloses a mixed alkali catalyst based on double-phenol method for preparing an antioxidant and application. The preparation method comprises: the two alkyl substituted phenol and aldehyde compound is placed in the closed and in the reactor and in a mixed alkali catalyst can choose to add or not to add the presence of an organic solvent of the reaction is carried out under the condition of, and in the after the reaction is finished after processing the obtained compound antioxidant product double phenol apperception, the anti-oxidant product can be used for preparing the lubricating oil composition, composition or burns the oil line as plastic, rubber, such as anti-aging agent. Antioxidant bisphenol compounds of this invention for the production of simple operation, mild conditions, such as the sources of raw materials and catalyst of extensive and is cheap and easy to obtain, the reaction cycle is short, it is easy to control, process with high safety, low energy consumption in the producing process, the yield of the product and high purity, and can effectively control and reducing pollutant emissions, is a safe and energy-saving, environmental protection art. (by machine translation)
Sonocatalytic removal of naproxen by synthesized zinc oxide nanoparticles on montmorillonite
Karaca, Melike,Kiran?an, Murat,Karaca, Semra,Khataee, Alireza,Karimi, Atefeh
, p. 250 - 256 (2016/01/16)
ZnO/MMT nanocomposite as sonocatalyst was prepared by immobilizing synthesized ZnO on the montmorillonite surface. The characteristics of as-prepared nanocomposite were studied by scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD) techniques. The synthesized samples were used as a catalyst for sonocatalytic degradation of naproxen. ZnO/MMT catalyst in the presence of ultrasound irradiation was more effective compared to pure ZnO nanoparticles and MMT particles in the sonocatalysis of naproxen. The effect of different operational parameters on the sonocatalytic degradation of naproxen including initial drug concentration, sonocatalyst dosage, solution pH, ultrasonic power and the presence of organic and inorganic scavengers were evaluated. It was found that the presence of the scavengers suppressed the sonocatalytic degradation efficiency. The reusability of the nanocomposite was examined in several consecutive runs, and the degradation efficiency decreased only 2% after 5 repeated runs. The main intermediates of naproxen degradation were determined by gas chromatography-mass spectrometry (GC-Mass).
Antioxidant bisphenol compounds clean production method and application (by machine translation)
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Paragraph 0054; 0055, (2016/11/28)
The invention discloses a double-phenolic compound antioxidant clean production process and application. The clean production method comprises: in a solid acid catalyst, and in order to aliphatic aldehyde and dialkyl substituted phenol as raw material, the raw material and the catalyst is placed in a closed environment reaction, and the reaction of the reaction product after the end of filter heat, that is, to obtain the target product, which can be used for preparing lubricating oil composition or as a plastic, rubber, such as anti-aging agent. Antioxidant bisphenol compounds of this invention for the production of simple operation, mild conditions, such as the sources of the raw materials and catalyst, is cheap and easy to obtain, the reaction cycle is short, it is easy to control, process with high safety, low energy consumption in the producing process, high yield, high purity of the product, in the reaction process does not need to add water, organic solvent, surface active agent, there is no need to wash the product later, will not produce waste water, can greatly control and reducing pollutant emissions, is a safe and energy-saving, environmental protection art. (by machine translation)
METHODS AND COMPOSITIONS FOR INHIBITING VINYL AROMATIC MONOMER POLYMERIZATION
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, (2013/03/26)
Methods and compositions are provided for inhibiting the polymerization of a vinyl aromatic monomer, such as styrene monomer, during elevated temperature processing thereof or during storage or shipment of polymer containing product. The compositions comprise a combination of a quinone methide derivative A) and a phenol compound B). The methods comprise adding from about 1-10,000 ppm of the combination to the monomer containing medium, per one million parts of the monomer.
Convenient synthesis of 2,2-and 4,4-methylenebisphenols with bulky alkyl substituents and evaluation of their antioxidant activity
Buravlev, Evgeny V.,Chukicheva, Irina Yu.,Borisenkov, Mikhail F.,Kutchin, Aleksandr V.
, p. 3670 - 3676,7 (2020/08/31)
The work is devoted to a convenient procedure of the synthesis of 2,2-and 4,4-methylenebisphenols with alkyl substituents in heterogeneous catalysis. This compounds were obtained with yields up to 87% by reflux of 2,4-or 2,6-dialkylphenols with HCHO in n-octane in the presence of KSF clay. We found that the antioxidant activity on DPPH test for two novel methylenebisphenols having isobornyl fragments was comparable with control drugs.
About selective methods of synthesis of 6-tert-butyl-2-methylphenol and 6-tert-butyl-2,4-dimethylphenol
Krysin,Khlebnikova,Khlebnikov,Pokrovskii,Vasil'ev
experimental part, p. 1156 - 1162 (2011/05/04)
Vapor phase catalytic methylation with methanol of 2-tert-butylphenol at the temperature 280-300°C proceeds selectively with formation of 6-tert-butyl-2-methylphenol. Elevating reaction temperature above 300°C leads to formation of 2,6-dimethylphenol. Reaction of 2-tert-butylphenol with methanol in alkaline medium in the presence of zinc oxide is shown to lead initially to formation of a mixture of calixarenes and methylenebisphenols that at elevated temperature exert splitting leading in future to 6-tert-butyl-2,4-dimethylphenol. Obtaining it in this reaction from 2,2′-methylenebis-(6-tert-butyl-4-methylphenol) proceeds selectively. Pathways of the reductive methylation of methylenebisphenols with methanol in alkaline medium is considered.
