A novel binuclear chromium complex of dianionic [OSSO]-type ligand has been synthesized and employed toward the ring-opening copolymerization of renewable eugenyl glycidyl ether (EGE) and cyclic anhydrides (CAs) (succinic anhydride...
A new type of sustainable bimetallic
zinc complexes bearing macrocyclic
thioetherphenolate [OSSO]-type ligands has been developed and employed
toward the chemical fixation of carbon dioxide into cyclic carbonates.
The effects of reaction variables such as temperature, time, pressure,
and molar ratio of epoxide to catalyst on the catalytic performance
were systematically investigated. Based on the observations from structural
and spectroscopic analyses, a plausible catalytic mechanism for the
present reaction system was proposed, in which a Lewis acidic zinc
center activates the epoxide and a nucleophilic halide counterion
from the cocatalyst to ring open the activated epoxide. The two zinc
centers are situated sufficiently close to each other to rationally
allow a synergistic effect in the cycloaddition. The macrocyclic thioetherphenolate
[OSSO]-type catalyst showed excellent conversions and selectivity
for CO2 fixation into cyclic carbonates from a broad range
of terminal epoxides, including bis-epoxides and biomass-derived epoxides
substrates. Additionally, these catalysts demonstrate high stability
to moisture and oxygen, resistance to many kinds of impurity, and
good recyclability with negligible losses in catalytic activity.
A unique example of zinc bromide complexes bearing macrocyclic [OSSO]-type thioetherphenolate ligand (Di-[OSSO]ZnBr) has been successfully explored toward ring-opening polymerization (ROP) of -caprolactone (ε-CL) in the presence of epoxides and...
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