Abstract
AbstractThe β‐diketiminato yttrium complexes [(BDIPh)2Y{N(SiHMe2)2}] (1, BDIPh = [PhNC(Me)CHC(Me)NPh]−), [(BDIPh)3Y] (2), and [(C5Me5)(BDIPh)Y{N(SiHMe2)2}] (4) are available via amine elimination starting from (BDIPh)H and either [Y{N(SiHMe2)2}3(THF)2] or [(C5Me5)Y{N(SiHMe2)2}2(THF)] (3). X‐ray crystallographic analysis of complexes 1 and 4 revealed a η5 coordination mode for the β‐diketiminato ligand, whereas the distorted octahedral complex 2 displayed pure κ2 coordination. Complex 3 was also structurally characterized. 1, 3, and 4 are moderately active catalysts in the copolymerization of cyclohexene oxide and CO2. Complex 3 was the most active system (TOF up to 33 h−1 at 75 °C, 8.5 atm CO2) and gave the highest molecular weight and narrowest polydispersity (Mn = 12600 g mol−1, Mw/Mn = 1.6).
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