Carboxylative cyclization of atmospheric CO2 with alkynol catalyzed by a 1-methylhydantoin anion-functionalized ionic liquid via chelative interactions

[1-MHy] − acts as a “pincer ligand” to form chelative interactions with –OH to enhance MBY activation, thus ensuring efficient [P 4442 ][1-MHy]-catalyzed reaction of atmospheric pressure CO 2 with MBY under metal- and solvent-free conditions.