Results 21 to 30 of about 837,071 (240)

Electro Polymerization of Polypyrrole Coatings Doped with Different Proton Acids for Corrosion Protection of 304 Stainless Steel

open access: yesMATEC Web of Conferences, 2017
Polypyrrole (PPY) coatings doped with sulphuric, oxalic and phosphoric acid were prepared on 304 stainless steel (304SS) by electropolymerization. Surface morphology and anti-corrosive performance of the polymer film was investigated by scanning electron
Jiang Li   +5 more
doaj   +1 more source

Temperature Effects on Adsorption Rate for Azo Dye Removal From Textile Waste Water Using Activated Bentonite Clay

open access: yesNUST Journal of Engineering Sciences, 2019
Waste water from the textile industry is one of the major sources of contamination causing serious health problems. In textile waste water, dyes are the main pollutant.
Atif Khan   +4 more
doaj   +1 more source

Phosphonium ion tagged chiral phosphoric acids and their application in Friedel-Crafts reactions of indoles

open access: yes, 2011
The attachment of phosphonium ion phase tags to chiral binapthyl-based phosphoric acid catalysts, and the use of these materials in a range of organocatalytic asymmetric Friedel-Crafts reactions of indoles has been studied. Placement of the tags at the 3
Julia Hermeke   +3 more
core   +1 more source

Hyper-Crosslinked Porous Chiral Phosphoric Acids: Robust Solid Organocatalysts for Asymmetric Dearomatization Reactions

open access: yes, 2022
Knitting rigid aromatic building blocks using external crosslinkers has been developed into an effective strategy for the synthesis of porous polymers in recent years.
Lei-Ming Zou (12341233)   +11 more
core   +1 more source

Determination of organic acids in olive fruit by HPLC

open access: yesCzech Journal of Food Sciences, 2010
Organic acids (oxalic, citric, malic, and succinic) contents of Domat, Memecik and Uslu varieties of olives grown in Turkey were investigated using HPLC method. Organic acids were extracted from olives with water-methanol mixture solution 75:25 (v/v) and
Pelin Günç Ergönül, Cevdet Nergiz
doaj   +1 more source

EFFECT OF SOME MINERAL AND ACID FERTILIZERS ON SWEET PEPPER PRODUCTIVITY AND QUALITY UNDER RAS SUDR CONDITIONS. [PDF]

open access: yesJournal of Plant Production, 2011
The field experiment was carried out in the Experimental Farm of the Desert Research Center at Ras Sudr Region, South Sinai Governorate, during the two successive summer seasons of 2008 and 2009 to study the effect of the combinations among three levels ...
I. El-Hifny, A. Almahdy
doaj   +1 more source

Enantioselective Synthesis of Chiral Amides by Phosphoric Acid-Catalyzed Asymmetric Wolff Rearrangement [PDF]

open access: yes, 2023
The enantioselective addition of potent nucleophilic reagents to ketene compounds poses challenges due to the presence of significant background reactions, along with simultaneous stereoselectivity and enantioselectivity issues in the reaction process ...
Jia-Bin, Pan   +4 more
core   +2 more sources

Chiral 1H NMR of Atropisomeric Quinazolinones With Enantiopure Phosphoric Acids

open access: yesFrontiers in Chemistry, 2018
A chiral phosphoric acid promoted enantioselective NMR analysis of atropisomeric quinazolinones was described, in which a variety of racemic arylquinazolinones such as afloqualone and IC-87114 were well recognized with up to 0. 21 ppm ΔΔδ value.
Chaofei Wu   +5 more
doaj   +1 more source

Expedient Method for Direct Mono-amidation of Phosphonic and Phosphoric Acids [PDF]

open access: yes, 2020
Mono-amidated P(V) pro-drugs predominately contribute to the vastly improved delivery of phosphate and phosphonate-containing anti-viral/cancer nucleotide analogues.
Victoria, Yan   +2 more
core   +2 more sources

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