Electrochemical-induced solvent-tuned selective C(sp 3 )-H bond activation towards the synthesis of C3-functionalized chromone derivatives.

An unprecedented solvent-tuned electrochemical method for selective C(sp ³ )-H bond activation towards the synthesis of C3 functionalized chromone derivatives has been developed. This electrosynthesis protocol provides an efficient and green way to access various C3-functionalized chromones by avoiding traditionally employed transition metals and high temperatures. The swappable chemoselectivity was controlled mainly by altering the solvent and the current. A plausible reaction mechanism has been proposed with the help of radical capture and cyclic voltammetry experiments.