Results 31 to 40 of about 42,123 (288)

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

, 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, Toy, PH, Patrick H. Toy, Hermeke, J   +3 more
core   +1 more source

Highly Enantioselective Organocatalytic Biginelli and Biginelli-Like Condensations: Reversal of the Stereochemistry by Tuning the 3,3′-Disubstituents of Phosphoric Acids

, 2016
Organocatalytic enantioselective Biginelli and Biginelli-like reactions by chiral phosphoric acids derived from 3,3′-disubstituted binaphthols have been investigated.
Xiao-Hua Chen (1336080), Shi-Wei Luo (1710163), Jin Song (276305), Wu Fan (1964023), Nan Li (155066), Liu-Zhu Gong (1499827)   +5 more
core   +4 more sources

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

MATEC 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, Ma Haibo, Zhang Jiaqi, Lu Yu, Lu Hongbin, Meng Xiangkang   +5 more
doaj   +1 more source

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

NUST 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, Syed Hassan Javed Naqvi, Shabana Afzal, Faisal Rehman, Abdul Rehman   +4 more
doaj   +1 more source

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

Journal 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

Determination of organic acids in olive fruit by HPLC

Czech 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

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

, 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, Zhi-Chun, Yang, Xuan-Ge, Zhang, Mao-Lin, Li, Qi-Lin, Zhou   +4 more
core   +1 more source

Influence of monoisodecyl phosphoric acid on extraction of neptunium with diisodecyl phosphoric acid. [PDF]

Journal of Nuclear Science and Technology, 1989
The influence of monoisodecy1 phosphoric acid (MIDPA) on the separation of Np with diisodecy1 phosphoric acid (DIDPA) was studied from the aspects of the extraction rate and the back-extraction with H2C2O4 solution. This study is important for the development of the partitioning method for high-level waste because MIDPA is one of the radiolysis ...
MORITA, Yasuji, KUBOTA, Masumitsu, YONEYA, Masahiro, TOCHIYAMA, Osamu, INOUE, Yasushi   +4 more
openaire   +1 more source

Incorporation of Selenium into Sol–Gel‐Derived Bioactive Glass: Influence on Glass Structure, Bioactivity, and its Selective Cytotoxicity

Advanced Engineering Materials, EarlyView.
Selenium was incorporated into a sol–gel‐derived bioactive glass to enable sustained therapeutic ion release. The selenium‐containing glass preserved bioactivity while selectively inducing cytotoxicity in osteosarcoma cells and maintaining osteoblastic viability.
Breno Rocha Barrioni, Thalita Marcolan Valverde, Talita Martins, Guilherme Mattos Jardim Costa, Alfredo Miranda de Goes, Marcello Rosa Dumont, Eduardo Henrique Martins Nunes, Marivalda de Magalhães Pereira   +7 more
wiley   +1 more source

Polarizable Vanadium Dipoles Promote Water Dissociation on Vanadium‐Based Metal Organic Framework

Advanced Functional Materials, EarlyView.
The polarization of unpaired V 3d electrons weakens the H─O bond to improve water dissociation by the dual Vδ+:O─H and Pλ−:H─O coupling hydrogen bonds formation and relaxation. P@V‐MOF electrocatalyst shows low overpotentials (94 mV in acid, 178 mV in neutral, and 77 mV in alkaline solutions) with excellent stability for effective overall water ...
Xinjuan Liu, Jun Xu, Minmin Fan, Jingcheng Xu, Mengyuan Li, Yun Gong, Weiwei Yang, Lei Li, Yong Zhou, Deqiang Zhao, Yuhua Xue, Xingtao Xu, Chang Q. Sun, Liming Dai   +13 more
wiley   +1 more source