?'he photolysis of ketene in the presence of hydrogen has been investigated in the temperature range -40" to 207'C. The main products are CO, C?H4, C2H6, and CHr, with some methyl ethyl ltetone a t the higher temperatures.
The mercury photo-sensitized decomposition of ethane has been carried out with particular emphasis on the high temperature reaction. Evidence is given that under these experimental conditions the ethyl radical becomes unstable around 400°C. An activation energy of 39.5 kcal is assigned to the reaction C2H5=C2H4+Hon the basis of the proposed mechanism.
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