Cu-Catalysed N-Arylation of Hydrazines with Bismuthanes: Synthesis and Pinacol or Imino-Pinacol Coupling of 4-Formylphenylhydrazines and their Phenylimine Derivatives

Acetal protected 4-formylphenylbismuthane was prepared and used for arylation of trisubstituted hydrazines. Formylphenylhydrazines, obtained after removal of acetal group, were used in coupling reaction to give diols containing two sub­stituted hydrazino moieties and the coupling of corresponding ­phenylimine derivatives gave corresponding diamines.