- Facile synthesis of α-amino phosphonates in water by Kabachnik-Fields reaction using magnesium dodecyl sulfate
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The three-component reaction of aldehydes, amines and triethyl or diphenyl phosphite was efficiently catalyzed by magnesium dodecyl sulfate at room temperature in water to give various α-amino phosphonates in high yields. The catalyst is easily available from inexpensive sodium dodecyl sulfate and magnesium bromide.
- Ando, Kaori,Egami, Tomoe
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experimental part
p. 358 - 362
(2012/01/06)
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- Diagrams of equilibria between mixed micellar solutions of sodium and magnesium dodecyl sulfates and the solid phase
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The dependence of the temperature of solution of the solid phase on the component ratio and the total content of surface active substances in solution was studied for mixtures of ionogen surface active substances (sodium and magnesium dodecyl sulfates). Data on the influence of salts (NaCl and MgCl2) on the Craft boundary for these systems were obtained. The mean activities of sodium dodecyl sulfate were calculated in a wide concentration range based on the studied solubility diagrams.
- Smirnova,Smirnova
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p. 1656 - 1660
(2007/10/03)
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- Kinetics of the Acid-catalysed Hydrolysis of Dodecylsulphate and Dodecyldiethoxysulphate Surfactants in Concentrated Micellar Solutions. Part 1. - Effects of Acid and Surfactant Concentrations and of the Nature and Concentration of Counterions
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The rates of the acid-catalysed hydrolysis of sodium dodecylsulphate (SDS) and sodium dodecyldiethoxysulphate (SDE2S) have been investigated in concentrated surfactant solutions (0.035 - 0.6 mol dm-3).The acid concentration dependence of the initial rates shows a 'saturation' effect, whereas increasing surfactant concentrations above the c.m.c. lead to a maximum in the k2,obs values, beyond which they decrease sharply.These results are discussed in terms of the ion-exchange pseudophase model of the miceller reaction.The nature of the counterion has an effect on k2,obs, the values following the sequence NH4 > Li > Na >> Mg.This has been ascribed to differences in the ion-exchange constants, KH/X, of these cations in the Stern layer of the micelles with the hydrogen ion.Maintaining the total counterion concentration and the ratio of concentrations of surfactant counterion to the concentration of hydrogen ion constant (at 30, i.e. 0.6 : 0.02 mol dm-3) largely eliminates the decrease in the k2,obs values with increasing surfactant concentration, as expected from the pseudo-phase ion-exchange model.Quantitative agreement between theory and experiment is less good, however, owing at least partly to deviations from ideality in solutions of high ionic strength.
- Garnett, Christopher J.,Lambie, Alan J.,Beck, William H.,Liler, Milica
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p. 953 - 964
(2007/10/02)
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