pyridine; oxygen; copper diacetate; sodium carbonate in toluene T=100°C; P=760.051 Torr; 12 h; Schlenk technique; Reagent/catalyst;

[N,N'-bis(5-sulfonatosalicylidene)-1,2-diaminoethane]copper disodium salt; sodium carbonate in water T=100°C; 12 h; Green chemistry;