NEWS ture of the liquid phase was considered. J. H. Knox also reported a preference for packed columns for speed. S. J. Hawkes used thermogravimetric techniques to evaluate the temperature limitations of stationary phases. Decomposition of polymers was noted. The bleeding liquid phases showed verymarked effects on the background signal of an argon detector, particularly at higher temperatures. Borazole derivatives were studied as possible substrates. A combination of capillaries and the methylene insertion reaction was used by M. C. Simmons to demonstrate their usefulness for studying the reaction statistics and the preparation of compounds not otherwise conveniently available. The technique was demonstrated on the analysis of a mixture of nonane isomers. Resolution of the two racemic pairs of 2,3,4-trimethylhexane was reported. James of British Rubber reported separation of the diastereo isomers of a sulfide and an alcohol. The interesting topic of preparative scale chromatography was discussed by F. H. Huyten from a study of a 3-inch column. Packing method was very important. This was found also by E. Bayer with 10-cm. columns and 50-ml. samples. No one packing technique is best for all sizes and materials. T. Johns reported results with a commercial preparative unit. Following E. R. Adlard's report on the accurate determination of specific retention volumes, J. C. Winter considered the problem raised by surface adsorption phenomena observed for nonpolar solutes on polar liquid phases. A. J. P. Martin was quick to point out the potential advantages if this can be refined to give a measure of effective liquid surface area. K. Borer listed retention time factors for a variety of functional groups. The values were used additively to predict the retention times in decomposition studies where known samples are not available. In two detailed papers C. S. G. Phillips reported further studies in the application of metal coordination compounds as liquid phases. Specific retardation for molecules capable of being coordinating liquids was found for several metal Ar-dodecyl-salicylaldimines and methyl n-octyl glyoximes. A platinum bridge compound gave good paraffin-olefin separation. A variety of effects of temperature was observed and explained by entropy considerations. Crystalline inclusion compounds of tri-o-thymotide provide interesting separations on the basis of size and shape when it is used in a liquid stationary phase.
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67 A
