Specific Adsorption 695 3. If a small amount of one rare earth is to be cross contamination of the peaks.V. Acknowledgments.-The author wishes to thank Mr. D. Nethaway for his considerable assistance in assembling and operating the ion-exchange columns and Drs, P.
The configurations of the following compounds have been established; the meso-, d-and L-2,3-butanedlamines, meso-, d-and L-2,3-dimethylethyleneimines (2,3-dimethylaziridines), and the d-and L-erythro-and d-and L-/Areo-3-ammo-2butanols. It has been shown that one Walden inversion is associated with a number of ring openings and closing, viz.(1) opening of the oxide ring of 2,3-epoxybutane with ammonia; (2) opening of the imine ring of 2,3-dhnethylethyleneimine with ammonia; (3) opening of the same ring wiith water, and (4) closing of the same ring. The reduction of dimethylglyoxime can be accomplished with Raney aluminum-nickel alloy and aqueous base to yield a mixture of dl-and meso-2,3butanediamine along with some 3-amino-2-butanol.
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