Room temperature diazotization and coupling reaction using a DES–ethanol system: a green approach towards the synthesis of monoazo pigments

Abstract

An environmentally benign, one-pot diazotization and coupling reaction using ChCl:tartaric acid DES at room temperature is described. The bulky tartrate ion renders stability to the diazonium salt at room temperature, also evidenced by ¹H NMR. The isolated diazonium salt is stable and active even after 192 h at room temperature.