Journal
MACROMOLECULES
Volume 51, Issue 23, Pages 9871-9877Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.8b01651
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Funding
- Fondazione Cariplo (Milano, Italy) [CUP B42F17000080005]
- University of Naples Federico II (Ricerca di Ateneo 2017) [DR_409_2017]
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Five new Zn(II) complexes bearing pyridylamido ligands with different substituents at the pyridine and at the amido moieties were synthesized and evaluated as catalysts for the alternating copolymerization of carbon dioxide and cyclohexene oxide. Polymers with carbonate linkages ranging between 86 and 99% and a slightly isotacticenriched structure were selectively obtained under a variety of reaction conditions, including 1 atm of CO2 pressure, without any cocatalyst. Some experimental and theoretical evidence suggested that different initiating species are involved in the catalytic cycle, including dimeric [(L-x)Zn(mu-OR)](2) and [(L-x)Zn(mu-O2COR)] complexes similar to those involved in the classical beta-diiminate Zn(II) catalysts.
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