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Showing 1 to 5 of 5 for “"Quaternisation"”.
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Quarternisation of Benzothiazoles and 1,2,3 - Benzothiadiazoles
… are discussed. Alternative methods of quaternisation using the more reactive dimethyl and diethyl sul-phates, methyl toluene-p-sulphonate, and methyl and ethyl 2,4-dinitro- benzenesulphorates to give new quaternary salts are described and discussed. Ion-exchange methods were employed to …
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Novel polyelectrolyte complexes for oral insulin delivery.
… Paa (QPaa). The average level of polymer quaternisation was determined by elemental analysis and was found to be 72 plus-minus 2 mol%. Subsequent thiolation of Paa and QPaa involved carbodiimide mediated conjugation to N-acetylcysteine (NAC) and modification of the polymers using …
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The synthesis and reactivity of 7-azaindolizines.
… at the non-bridgehead nitrogen. Similarly quaternisation was found to occur at the non-bridgehead nitrogen. Lithiation of 8-methyl-7-azaindolizine showed the 8-methyl group of 2,8-dimethy1-7-azaindoilzine to be acidic. Reaction between 2,3,8-trimethyl-7-azaindolizine and ethoxalyl chloride …
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A novel polyelectrolyte complex between amphiphilic poly (allyl amine) and sodium alginate.
… iodide, resulting in samples with degrees of quaternisation of 18% and 35%, based on elemental analysis. Alginate/poly (allyl amine) complexes were analysed at a number of mass ratios and using a number of techniques, including: dynamic light scattering; differential scanning calorimetry with …
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New thin shell silica particles and HILIC phases for liquid chromatography: synthesis, characterisation and functionalisation
… (ExsilTM pure) by silane chemistry and further quaternisation with sodium chloroacetate for HILIC separation of polar analytes. All bonded phase materials were characterised by microanalysis, thermogravimetric analysis (TGA) and diffuse reflectance infrared Fourier transform (DRIFT) …