readily available precursors. Preformed cobalt(II) and in-situ-generated copper(I) complexes of these ligands were tested as catalysts in the metal-catalysed cyclopropanation of styrene with diazoacetates. Under optimised reaction conditions, which include the use of a fluorousbiphasic system and short reaction times, the copper complex of a C2-symmetric diamine afforded promising results (yield = 77%