Usually used to synthesize N′-[(E)-5-bromo-2-hydroxy-3-methoxybenzylidene]-4-methoxybenzohydrazide monohydrate,2,5-bis(4-methoxyphenyl)-1,3,4-oxadiazole,hydrazone ligands, which readily forms ruthenium(II) hydrazone complexes via reaction with [RuHCl(CO)(