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- W2047914910 abstract "Abstract Metathesis of {[(4–XC 6 H 4 )NC(Me)] 2 CH}Li with anhydrous lanthanide trichlorides (LnCl 3 ) in a 3:1 molar ratio yielded a series of tris‐β‐diketiminate complexes with the general formula [LnL X 3 ] [X = Cl, L Cl : Ln = Pr ( 1 ), Nd ( 2 ), Sm ( 3 ); X = H, L: Ln = Nd ( 4 ); X = Me, L Me : Ln = Nd ( 5 )]. Reaction of sodium salt of β‐diketiminate with anhydrous LnCl 3 in a 1:1 molar ratio in thf afforded the corresponding β‐diketiminate lanthanide dichlorides [L Cl PrCl 2 (thf) 2 ] ( 6 ), [L Me NdCl 2 (thf) 2 ] ( 7 ), and [L NdCl 2 (thf) 2 ] {L = [(2,6‐ i Pr 2 C 6 H 3 )NC(Me)] 2 CH – } ( 8 ), respectively. Each of these complexes was characterized, and the molecular structures of complexes 1 – 5 and 8 were determined by X‐ray single‐crystal structure analysis. Complexes 1 – 5 were found to be very active single‐component initiators for the ring‐opening polymerization of ϵ‐caprolactone (ϵ‐CL) and L ‐lactide ( L ‐LA) under mild conditions, giving polymers with high molecular weight and moderate polydispersities, whereas complexes 6 – 8 displayed no activity under the same polymerization conditions. The high catalytic activity shown by tris‐β‐diketiminate lanthanide complexes may be attributed to the activated Ln–β‐diketiminate bond caused by the crowded coordination sphere around the central metal.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)" @default.
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- W2047914910 date "2009-09-01" @default.
- W2047914910 modified "2023-10-08" @default.
- W2047914910 title "Syntheses and Structures of Tris‐β‐Diketiminate Lanthanide Complexes and Their High Activity for Ring‐Opening Polymerization of ϵ‐Caprolactone and <scp>L</scp>‐Lactide" @default.
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- W2047914910 doi "https://doi.org/10.1002/ejic.200900313" @default.
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