The oxidation of hydrazine at a mercury or oxide-coated platinum electrode yields nitrogen as the principal product. Under some conditions, however, ammonia also is formed as a result of the dimerization of diimide. A mechanism for the process is suggested : though generally similar t o the accepted mechanism for the reaction of hydrazine with a two-electron chemical oxidizing agent, it also serves t o explain the effects of such variables as PH and chloride-ion concentration on the extent of the dimerization reaction. ( 7 ) H. Gilman and R. E. Brown, ibid., 52, 3314 !1F180). (8) H. Gilman a n d J. F. l i e l s o n Rec ti'u:'. r h i m , 65, ,518 (1936).

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