نتایج جستجو برای: para toluene sulphonic acid

تعداد نتایج: 1026329  

Journal: :علوم و تکنولوژی پلیمر 0
محمدحسین بهشتی کاوه دوستخواه

phenolic resins are synthetic low molecular weight thermoset resins which are polymerized and cured to higher molecular weights by condensation method. these resins have high weathering resistance, high oxidative thermal properties and good chemical resistance. phenolic resins can be cured thermally or by acid curing. the most common method of curing phenolic resin is by thermal curing that tak...

2009
Eva Håkansson Andrew Amiet Akif Kaynak

The dielectric behaviour of in-situ polymerized thin polypyrrole (PPy) films on synthetic textile substrates were obtained in the 1-18 GHz region using free space transmission and reflection methods. The PPy/para-toluene-2-sulphonic acid (pTSA) coated fabrics exhibited an absorption dominated total shielding effectiveness (SE) of up to -7.34 dB, which corresponds to more than 80 % of incident r...

Journal: :Chemical communications 2014
Shivani Mahajan Sadhika Khullar Sanjay K Mandal Inder Pal Singh

A one pot domino protocol for an efficient synthesis of 7-arylbenzo[c]acridine-5,6-diones, with a novel nucleus, has been developed by reacting 2-hydroxynaphthalene-1,4-dione, aromatic aldehydes and aromatic amines using environmentally benevolent p-toluene sulphonic acid as a catalyst. An exciting feature of this communication is the reaction mechanism that depends on the reaction solvent.

Journal: :Biomedicine 2022

Introduction and Aim: An efficient aspect of two step synthesis tetrahydro pyrimidine carboxamide derivatives were developed by Biginelli reaction. The two-step synthesized 1,2,3,4-tetrahydropyrimidinecarboxamide compounds evaluated In-vitro studies like antifungal bacterial activities. Few shown excellent zone inhibition against fungal Microbial In this study showed significant effect action d...

Journal: :International journal of advanced research 2022

A new series of fluorinated quinoline -1,4-dithiones 3(a-f) were obtained by the treatment 3-aryl-2-hydrazino-quinolines 1(a-f) with isobenzo furan-1,3-dithione 2 in presence p- toluene sulphonic acid (PTSA) solid state at room temperature as one pot. All products are monitored TLC and isolated GC furthermore confirmed spectral analysis.

Journal: :Reactions 2022

Oligo(L-lactic acid) (OLLA) was synthesized by ring opening polymerization of L-lactides using stannous octoate (0.03 wt% lactide). While this served as the initiator, L-lactic acids were co-initiators at 140 °C for 10 h, wherein prepared hydrolytic degradation 100 1 h. The molecular weight or degree controlled with monomer/co-initiator ratio (mol/mol). α-cellulose and microcrystalline cellulos...

Journal: :iranian chemical communication 2015
hadi jabbari jabbar khalafy peyman najafi moghadam

a most effective and less energy demanding method of producing fatty esters, diol esters, by esterifying fatty acids, with neopentyl and ethylenglycol alcohols in the presence of an acidic ion exchange resin catalyst(polyestyrendivinylbenzensulfated) was investigated at elevated temperature. in this process an azeotroping agent, toluene, was used to facilitate continuous removal of water by dis...

Hadi Jabbari, Jabbar Khalafy, Peyman Najafi Moghadam

A most effective and less energy demanding method of producing fatty esters, diol esters, by esterifying fatty acids, with neopentyl and ethylenglycol alcohols in the presence of an acidic ion exchange resin catalyst(polyestyrendivinylbenzensulfated) was investigated at elevated temperature. In this process an azeotroping agent, toluene, was used to facilitate continuous removal of water by dis...

2016
HONGCHANG PANG PENG TIAN

Core-shell AlOOH-polyglycol (APG) was synthesized by refluxing polyglycol with AlOOH nanoparticles in toluene in the presence of p-toluene sulphonic acid. The effects of solvent amount on the core-shell structure have been investigated. The morphology and thermal stability of the products were characterized by means of transmission electron microscopy (TEM) and thermogravimetric analysis (TGA)....

Journal: :The Journal of biological chemistry 2005
Ayelet Fishman Ying Tao Lingyun Rui Thomas K Wood

A primary goal of protein engineering is to control catalytic activity. Here we show that through mutagenesis of three active site residues, the catalytic activity of a multicomponent monooxygenase is altered so that it hydroxylates all three positions of toluene as well as both positions of naphthalene. Hence, for the first time, an enzyme has been engineered so that its regiospecific oxidatio...

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