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Efficient CO2 fixation into cyclic carbonates catalyzed by NNO-scorpionate zinc complexes. 2019

Sonia Sobrino, and Marta Navarro, and Juan Fernández-Baeza, and Luis F Sánchez-Barba, and Andrés Garcés, and Agustín Lara-Sánchez, and José A Castro-Osma
Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica, Centro de Innovación en Química Avanzada (ORFEO-CINQA) Campus Universitario, 13071-Ciudad Real, Spain. Juan.FBaeza@uclm.es.

A series of new chiral zwitterionic NNO-scorpionate mononuclear zinc alkyls [Zn(R)(κ3-NNO)]Br was developed in very high yields via suitable quaternization in the scorpionate ligand. These zwitterionic complexes performed as bifunctional catalysts and exhibited improved catalytic activity for the fixation of CO2 into cyclic carbonates compared to the neutral analog mononuclear [Zn(R)(κ3-NNO)] and binuclear [Zn(R)(κ2-NNμ-O)Zn(R)2] compounds. The catalyst system showed a broad substrate scope and functional group tolerance under mild and solvent-free conditions.

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