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4723Wijnen and Steacieg studied the photolysis of crtetradeuterodiethyl ketone in an effort to investigate the reactions of ethyl radicals. At temperatures above 200' they concluded that the ethylene produced was not the result of disproportionation, but was largely due to the decomposition of the pentanonyl radical.However, it was evident that some other ethylene producing reaction was taking place, since CzDzHz was formed considerably faster than the C2D2H4 (9) M . H. J. Wijnen and E. W. R. Steacie, Can. J. Chcm., 29, 1092 (1951).at temperatures of 300' and above. The authors apparently did not analyze for hydrogen in this work. Our work supports the thesis that the ethyl radical can decompose to give ethylene and a hydrogen atom in the region of 300'. It is probable that it is this decomposition of the CH3CDZ radical which caused the elevation of the CzDzHz/C2DzH4 ratio in the work of Wijnen and S t e a~i e .~ If the decomposition of the ethyl radical is an important reaction above 300', hydrogen must appear in the products. In a later paper, Kutschke, Wijnen and Steacie'O found no hydrogen in the products of the photolysis of the diethyl ketone, but all of their experiments were done a t temperatures below 300°, where none would be expected.

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