Results 41 to 50 of about 58,142 (306)
ZnO/ionic liquid catalyzed biodiesel production from renewable and waste lipids as feedstocks [PDF]
, 2019 A new protocol for biodiesel production is proposed, based on a binary ZnO/TBAI (TBAI = tetrabutylammonium iodide) catalytic system. Zinc oxide acts as a heterogeneous, bifunctional Lewis acid/base catalyst, while TBAI plays the role of phase transfer ...
Casiello, Michele +8 more
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(2S,NS)-N-Allyl-N-benzyl-1-hydroxy-3-(4-hydroxyphenyl)-N-methylpropan-2-aminium bromide
Acta Crystallographica Section E, 2008 The title compound, C20H26NO2+·Br−, is an N-chiral quaternary ammonium salt synthesized from (2S*)-N-benzyl-N-methyltyrosine methyl ester. The dihedral angle between the phenyl ring and the benzene ring is 11.61 (19)°.
Hua-Fang Wu +4 more
doaj +1 more source
Journal of Oral MicrobiologyObjectives Microbial contamination of various accessory parts of the dental chair units (DCUs) is an essential source of cross infection, while the accessories of the crucial suction function are usually overlooked.
Xuerong Lv +6 more
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CHIMIA, 2007 In this paper we review our recent studies into the phase-transfer catalysed asymmetric alkylation of glycine imines using quaternary ammonium salt catalysts derived from dihydrocinchonidine and ?-methylnaphthylamine.
Barry Lygo, Douglas J. Beaumont
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Heteroatom Chemistry, 2021 Tandem conjugate addition–alkylation reaction of various amines with α-bromo-α, β-unsaturated ketones resulted in near-quantitative conversions into the corresponding aziridines when the reaction was carried out in the presence of 10 mol% of phase ...
Alemayehu Mekonnen, Alemu Tesfaye
doaj +1 more source
Turbulence and Cavitation Suppression by Quaternary Ammonium Salt Additives [PDF]
, 2018 We identify the physical mechanism through which newly developed quaternary ammonium salt (QAS) deposit control additives (DCAs) affect the rheological properties of cavitating turbulent flows, resulting in an increase in the volumetric efficiency of ...
Barbour, R. +10 more
core +1 more source
Curare-like Action of Polymethylene bis-Quaternary Ammonium Salts [PDF]
Nature, 1948 H.R. (Raymond) Ing was a chemist who developed a unique understanding of pharmacology, which arose from working on alkaloid chemistry. To the chemist he is Ing of the Ing and Manske reaction (for the preparation of primary amines) and responsible for working out the structure of the alkaloid cytisine.
R B, BARLOW, H R, ING
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Synthesis and Catalytic Activity of Bifunctional Phase-Transfer Organocatalysts Based on Camphor
Molecules, 2023 Ten novel bifunctional quaternary ammonium salt phase-transfer organocatalysts were synthesized in four steps from (+)-camphor-derived 1,3-diamines. These quaternary ammonium salts contained either (thio)urea or squaramide hydrogen bond donor groups in ...
Luka Ciber +6 more
doaj +1 more source
The Use of Cationic Agents to Increase the Efficiency of Titanium Dioxide in Paper [PDF]
, 1966 Handsheets were made with a bleached sulfite pulp, titanium dioxide and cationic agents. The optical properties of these sheets were studied in order to determine and compare the efficiency of the titanium dioxide retained.
Clapp, Richard
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Antifungal activity of gemini quaternary ammonium salts
Microbiological Research, 2013 A series of gemini quaternary ammonium chlorides and bromides with various alkyl chain and spacer lengths was synthesized. The most active compounds against fungi were chlorides with 10 carbon atoms within the hydrophobic chain. Among these compounds were few with no hemolytic activity at minimal inhibitory concentrations.
Obłąk, Ewa +3 more
openaire +2 more sources