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Showing 1 to 20 of 88 for “"Quaternary ammonium"”.
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Evaluating Immunotoxicity of Quaternary Ammonium Compounds
Alkyl dimethyl benzyl ammonium chloride (ADBAC) and didecyl dimethyl ammonium chloride (DDAC) are common quaternary ammonium compounds used as disinfectants in households, medical, and restaurant settings. They cause occupational skin and respiratory hazards in humans, and developmental and …
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Synthesis and resolution of enantiomeric quaternary ammonium halides
The purpose of the work described in this thesis was the synthesis of a new class of surfactants containing chiral cationic end groups and the synthesis of two chiral reactant molecules which would react in the presence of these surfactants. The structures of the surfactant and substrate molecules …
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Micellar properties of spermicidal and microbicidal quaternary ammonium surfactants
Quaternary ammonium lipids containing long hydrocarbon-chains can cause deleterious effects when administered to many types of microorganisms. Some compounds have potent activity against spermatozoa and the HIV virus. Consequently, quaternary ammonium lipids are key components in spermicidal and …
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Effects of Quaternary Ammonium Disinfectants on Mouse Reproductive Function
Quaternary ammonium compounds (QACs) are antimicrobial disinfectants commonly used in commercial and household settings. While these compounds have been used for decades, reproductive toxicity has not been thoroughly evaluated. Extensive use of QACs results in ubiquitous human exposure to …
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Development of novel methodologies utilizing quaternary ammonium salts as catalysts
The first half of this thesis (Chapter 2) described the development of a fluoride-promoted conjugate addition of sulfur-stabilized carbanion nucleophiles to α,β-unsaturated ketones and esters. This reaction was achieved using a substoichiometric amount of TBAF, resulting in high yields on the …
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Synthesis and antibacterial assessment of water-soluble hydrophobic chitosan derivatives bearing quaternary ammonium functionality
… by chitosan. In this context, certain quaternary ammonium derivatives of chitosan have been shown in the past to be highly effective antibacterial materials. In the present study, substituted chitosan derivatives were synthesized and further quaternized using Quat-188 to produce water …
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Part I. The Nuclear Magnetic Resonance of Quaternary Ammonium Salts. Partii. Leaving Group Effects in Some Solvolysis Reactions
Made available in DSpace on 2014-12-09T17:35:16Z (GMT). No. of bitstreams: 1 6511748.pdf: 5533111 bytes, checksum: 9ad51f0e52eefb329f0368ac49c0d690 (MD5) Previous issue date: 1965
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SYNTHESES AND ESTROGENICITY STUDY OF DIETHYLSTILBESTROL AND BISPHENOL-A ANALOGS AS POTENTIAL REPLACEMENT FOR BISPHENOL-A AND INVESTIGATION ON NOVEL REACTIONS INDUCED BY IODANE/QUATERNARY AMMONIUM HALIDES
… agreeing with our hypothesis. Iodane/quaternary ammonium halide in nitromethane was utilized to explore aromatic bromination, N-nitrosation-dealkylation, and benzoate ester formation from benzylamines. Koser's reagent was found to be a suitable iodane for aromatic bromination reaction, …
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An investigation of phase transfer catalysis employing quantitative structure-activity relationships
… procedure was developed to prepare libraries of quaternary ammonium ions sharing a common core scaffold. In total, 80 quaternary ammonium bromides were prepared in this way. A kinetic method for the analysis of liquid-liquid PTC reactions was refined. The kinetic profile for an enolate alkylation …
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Electrochemical Evaluation of Surfactants Relevant to Ligand Stabilized Nanoparticles
… perception concerning the growth mechanism of quaternary ammonium surfactant stabilized gold nanorods. Halide induced aggregation of DMAP monolayer protected gold nanoparticles is investigated by studying the electrochemical adsorption of DMAP and halide ions on analogous gold electrode …
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The adsorption of phenolic and organotin compounds by clays and cation exchanged clays
Quaternary ammonium exchanged laponites (Quat-laponites) show selectivity in the adsorption of phenols and chlorinated phenols. Strong adsorbate-adsorbent interactions are indicated by adsorption isotherms. Adsorption of phenols and chlorinated phenols by Quat-smectites is greater than that by the …
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I. Catalyst development in asymmetric phase transfer catalysis employing QSAR methods II. Computational investigations on the stereochemical course of the addition of allylsilanes to aldehydes
… with libraries of enantiomerically enriched quaternary ammonium ions. The synthesis of the quaternary ammonium ions follows a diversity oriented approach wherein the tandem inter[4+2]/intra[3+2] cycloaddition of nitroalkenes serves as the key transformation.. Catalyst activity and selectivity …
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Synthetic Strategies and Design of Highly Luminescent Cholinomimetic Quantum Dots
… –OH moiety on the surface, the second with the quaternary ammonium group on the surface and the third with both functional groups on the surface to work together as a cholinomimetic probe, as the quaternary ammonium and the alcohol groups are the two important groups on choline and the mode of …
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Interactions of Nitrated Aromatics With Electron Rich Species: Chiral and Achiral
… enantioselectivity observed in these systems. Quaternary ammonium cations are identified as stabilizing factors for the negatively charged Meisenheimer complexes in non-polar organic solvents. The gained mechanistic insight allowed the development of the first enantioselective nucleophilic …
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Stable Fluorinated Antimicrobial Coatings
… of death in the US. Surfaces modified with quaternary ammonium containing side chains have been known to demonstrate excellent antimicrobial properties. Prior work has indicated that polyurethane surfaces with copolyoxetane soft blocks consisting of fluorinated and quaternary ammonium side …
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