Non-ionic-C ationic Micellar Properties of Dimethyldodecylamine Oxide 295 tants are electronically in their ground state, and reaction takes place at a conveniently low temperature.Although this study does not indicate a specific reaction, there is evidence that hydrogen atoms add almost exclusively to the terminal carbon of a-olefins26•27 R(H,R)C=CH2 + H -> R (H,R)C-CHS giving a secondary or tertiary radical. On the basis of such information the properties of the transition state likewise can be calculated.

The crystal structures and accurate lattice constants of scandium, yttrium and the rare earth metals are given, and the values of their calculated mole-atomic volumes, densities, axial ratios and metallic radii are graphically compared. Expected variations due to the 'lanthanide contraction' and structure differences are noted, and additional irregularities in the axial ratio and metallic radii plots are indicated.

Phase diagrams and light-scattering measurements of a homologous series of dimethylalkylphosphine oxides are used to determine the micellar molecular weights and their relation to consolute phase boundaries in these systems. The temperature dependence of micellar molecular weights is discussed with regard to both light-scattering and solution theory, and it is concluded that, in systems which show consolute boundaries, the lightscattering behavior can be qualitatively explained on the basis of existing theory without invoking any large temperature or concentration dependence of micellar molecular weight. The observed light-scattering behavior can easily be accounted for by the nonideality of a micellar solution and the temperature dependence of micellar-water interactions. Lightscattering measurements at the critical concentration for phase separat,ion of the dimethyldodecylphosphine oxide-water system have also been made and show that, critical opalescence is observed in this system. These results are discussed in the light of existing theoretical treatments of this phenomenon, and the experimental results are shown to agree qualitatively with the theory.

No abstract

No abstract