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[Zinc(II)(Pyridine‐Containing Ligand)] Complexes as Single‐Component Efficient Catalyst for Chemical Fixation of CO 2 with Epoxides
Author(s) -
Cavalleri Matteo,
Panza Nicola,
Biase Armando,
Tseberlidis Giorgio,
Rizzato Silvia,
Abbiati Giorgio,
Caselli Alessandro
Publication year - 2021
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.202100409
Subject(s) - chemistry , catalysis , pyridine , solubility , zinc , solvent , yield (engineering) , epoxide , ligand (biochemistry) , homogeneous catalysis , polymer chemistry , organic chemistry , inorganic chemistry , biochemistry , materials science , receptor , metallurgy
The reaction between epoxides and CO 2 to yield cyclic carbonates is efficiently promoted under solvent‐free and relatively mild reaction conditions (0.5 mol % catalyst loading, 0.8 MPa, 125 °C) by zinc(II) complexes of pyridine containing macrocyclic ligands (Pc−L pyridinophanes). The zinc complexes have been fully characterized, including X‐ray structural determination. The [Zn(II)X(Pc−L)]X complexes showed good solubility in several polar solvents, including cyclic carbonates. The scope of the reaction under solvent‐free conditions has been studied and good to quantitative conversions with excellent selectivities have been obtained, starting from terminal epoxides. When solvent‐free conditions were not possible (solid epoxides or low solubility of the catalyst in the oxirane) the use of cyclic carbonates as solvents has been successfully investigated. The remarkable stability of the catalytic system has been demonstrated by a series of consecutive runs.