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Showing 1 to 20 of 32 for “"Dimethylsulfoxide"”.
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Dimethylsulfoxide as a Solvent in Coordination Chemistry
Made available in DSpace on 2014-12-05T19:37:43Z (GMT). No. of bitstreams: 1 6101671.pdf: 2337403 bytes, checksum: 88510458566427280ddbc384a56fffdf (MD5) Previous issue date: 1961
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An investigation of in vitro percutaneous penetration enhancement of benzocaine by azone, dimethylsulfoxide, and 2-pyrrolidone
… by 1-dodecylazacycloheptan-2-one (Azone) , dimethylsulfoxide (DMSO) and 2-pyrrolidone (2-P) under conditions of constant thermodynamic activity in the vehicle. The solubilities of benzocaine in Azone and 80/20, 60/40 and 40/60 V/V DMSO/water systems were found to be 254.17, 533.00, 68.60 and …
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A Conductometric Study of the Reaction Velocities of 2, 4-Dinitrochloro, Bromo, and Iodobenzene with Piperidine in Dimethylsulfoxide at Various Concentrations and Temperatures
… for the chloro, bromo, and iodo analogs in dimethylsulfoxide at 25.0°C were 142.2 ± 11.9, 111.2 ± 8.7, and 20.04 1 mol-1 min-1 ± 0.48, and at 35.0°C the average rate constants were 195.2 ± 20.0, 165.7 ± 19.2, and 30.62 1 mol-1 min-1. There are no comparable data by other methods. …
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Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
… through a second polymerization reaction in a dimethylsulfoxide and ethylene glycol solvent mixture which provides greater solubility for the polymers.</p> <p>The resulting poly(D-glucaramides) were found to serve as novel gel forming agents in aqueous solutions. Poly(hexamethylene …
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Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
… through a second polymerization reaction in a dimethylsulfoxide and ethylene glycol solvent mixture which provides greater solubility for the polymers.</p> <p>The resulting poly(D-glucaramides) were found to serve as novel gel forming agents in aqueous solutions. Poly(hexamethylene …
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An investigation into the ring-enlargement reactions of boron subphthalocyanine and boron subnaphthalocyanine
… were carried out in a mixture of toluene and dimethylsulfoxide at room temperature. This study represents the first synthesis of boron subphthalocyanine with trihexylsiloxy group in the axial position and the first investigation into the ring enlargement of boron subnaphthalocyanine in which …
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The application of gas liquid chromatography to the simultaneous analysis of sugars and sugar phosphates in biological samples /|nby David J. LeBlanc. -- 260 St. Catharines [Ont. : s. n.],
… samples. A new method of silylation involving dimethylsulfoxide, hexamethyldisilazane, trimethylchlorosilane and cyclohexane (1:0.2:0.1:1) which rapidly silylated sugars and sugar phosphates was developed. Subsequent chromatography on a 5% SE-52 column gave good resolution of the sugar and …
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NMR Linebroadening and Contact Shift Studies of Transition Metal Complexes in Nonaqueous Solvents.
Proton nmr linebroadening studies of dimethylsulfoxide (DMSO) +3 in tris (ethylenediamine) chromium(III) (Cr(en)3 +3)-DMSO solutions were conducted between 20° and 90°C. The resulting data were interpreted using the Swift-Connick relationships. The dominant contribution to linebroadening in the …
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Poly(pyridinium salt)s exhibiting liquid-crystalline and light-emitting properties
… in common organic solvents such as methanol and dimethylsulfoxide (DMSO), while others were found to exhibit a liquid-crystalline phase upon melting, and are so-called thermotropic liquid crystals. The polymers in solution formed a full-grown lyotropic liquid-crystalline phase at concentrations …
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Dynamics of Membrane Structure Formation in Quenched Polymer Solutions
… systems, poly(ether sulfone) [PES]/dimethylsulfoxide [DMSO]/water and cellulose acetate [CA]/acetone/water. The effects of quench temperature and initial solution composition on the predicted structure-formation dynamics are elucidated. For the PMMA/NMP/glycerol system, model …
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Effect of transport methods on recovery of bacteria from ground beef samples
… 20 or 30% (wt/vo1) buffered solutions of either dimethylsulfoxide or glycerol prior to freezing generally improved the survival of all microorganisms assayed regardless of the transport system tested. The results indicate that packaging perishable food samples with a volume of cryoprotective …
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Palladium(II) catalyzed allylic C-H alkylation reactions
… cycle was inhibited by a necessary cosolvent, dimethylsulfoxide. This solvent was speculated to act as a ligand for palladium, competitively binding to the metal and displacing the ligand required for C-H cleavage. By identifying a more electron-rich C-H cleavage ligand which presumably could …
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The precipitation of candidate drugs on mixing DMSO stock solutions with aqueous buffers
The precipitation of candidate drugs from dimethylsulfoxide (DMSO) stock solutions and buffer mixtures has practical importance within the pharmaceutical industry. At the drug discovery stage, mixing of drug DMSO stocks and aqueous buffer is a common procedure for many analyses, such as bioassay …
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Theory and applications of confocal micro-Raman spectroscopy on hybrid polymer coatings and PDMS membranes and spectroscopic studies of doped B2O3-Bi2O3 glass systems
… relevant molecules (b-carotene dissolved in dimethylsulfoxide) through a polydimethylsiloxane (PDMS)-membrane. The diffusion rate as a function of the measurement depth and diffusion time as well as the concentration gradient under a steady flux have been determined. The measurements shown …
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The study of capillary electrophoresis: polyimides, nylon and non-aqueous analysis
… using a mixture of N Methylformamide (NMF) and dimethylsulfoxide (DMSO). First, the application of CZE to polyimide compositional analysis is described. The electropherograms of decomposed products from polyimide are determined by the structure of monomers from which a polyimide is made. In most …
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The reduction of organic halides and diazonium salts with sodium borohydride
Sodium borohydride in aqueous dimethylsulfoxide has been shown to be a good reducing agent for converting certain activated aromatic halo-compounds to their corresponding dehalogenated products. The order for ease of removal of the halogen is I>Br>Cl. The activating groups are those that are …
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NMR Contact Shift and Line-Broadening Studies of Some Transition Metal-DMSO Complexes.
Dimethylsulfoxide (DMSO) is known to be a good ligand towards the formation of DMSO-complexed compounds. This work is concerned with the evaluation of the magnetic and kinetic properties of these compounds in DMSO solution. DMSO-complexed compounds of the transition metal ions, Cu(II), Ni (II), Co …
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Development and Standardization of a Short-Term Assay for Evaluating Polluted Estuarine and Coastal Environments: The Medaka Embryo-Larval Assay
… or mixture dissolved in membrane permeable dimethylsulfoxide (DMSO) solvent. Nine chemicals were initially evaluated with two, pentachlorophenol (PCP) and tributyltin chloride (TBTCl), subsequently selected for extensive evaluations of salinity tolerance and the accuracy of the topical …
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Variabilité des concentrations cellulaires phytoplanctoniques de diméthylsulfoniopropionate (DMSP) et de diméthylsulfoxyde (DMSO) en Baie Sud de la Mer du Nord
… An increase in DMS(P) and its oxidation product dimethylsulfoxide (DMSO) cellular contents have been frequently observed in cellular stress conditions. To test this, we have first analysed the natural distribution of DMS(P,O) cellular contents in the North Sea. Secondly, we have measured DMS(P,O) …
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Refractometry Studies of the Optical Properties of Polymer Films and the Development of Polymer Coated Refractive Index Sensors
… sucrose, ethylene glycol, glycerol, and dimethylsulfoxide were measured at λ = 1550 nm. These measurements will be useful for future calibrations of near-infrared refractive index sensors. A mathematical model is presented, where the concentration of analyte adsorbed in a film can be …
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