“Almost all possibilities have been exhausted”, stated H. Wieland in 1913 in the preface to his monograph Die Hydrazine with regard to the synthesis of N,N′-substituted hydrazines. Even today suitable reagents and methods are lacking for the preparation of these compounds, which are important as precursors of pharmaceuticals, agrochemicals, and dyestuffs. The readily available, protected hydrazine 1 is a new reagent that may fill this gap.
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Mäeorg et al. (1996) studied this question.