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could presumably be made by using a,a-diphenylethylene in place of ethylene in 2. If both phenyls were either above or below the square plane, two signals for the o-methyls should be observed. However, if the diphenylethylene were frozen out so that one phenyl was above and one phenyl below the plane, the omethyls would again be magnetically equivalent and only one signal should result. Unfortunately, the compound of interest could not be prepared, but the investigation is being pursued.Acknowledgment. The authors wish to thank Dr. Abstract:The kinetics of loss of deuterium from methoxyacetone containing deuterium a to the carbonyl group have been studied in aqueous solution. Catalytic constants have been determined for hydrogen ions, hydroxide ions, water, phenoxide ions, p-nitrophenoxide ions, trimethylamine, triethylamine, N-methylpyrrolidine, and Nmethylmorpholine. In the presence of N-methylmorpholine buffers the reaction is slightly subject to catalysis by methylammonium chloride, presumably because of the intermediate formation of an enamine. Exchange at the methyl position is faster (by up to sixfold) than at the methylene position for all the catalysts studied except hydroxide ions, which brought about slightly more rapid exchange at the methylene position.

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