5,5′-diamino-2,2′-bipyridine: A versatile building block for the synthesis of bipyridine/catechol ligands that form homo- and heteronuclear helicates

Article abstract of DOI:10.1002/chem.200401262

Herein we present an improved synthesis of 5,5′-diamino-2,2′- bipyridine (1) starting from the pyrrole-protected aminopyridine 4. By standard reactions 1 can easily be transformed into the imine- or amide-bridged dicatechol-bipyridine ligands L¹