Lithium aluminum hydride in refluxing ether or tetrahydrofuran reduces 1, 2-, diacyl-1, 2- dimethylhydrazines (RCOGCHa) z rapidly and in fair yields to the corresponding tetraalkylhydrazines (RCHZNCH~) Z. Acylhydrazines, such as RCONHNHCOR and RCOiSHN (CH3) 2, which have hydrogens on the acyl-substituted nitrogens, are reduced much more slowly under similar conditions.
