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- W2114937447 abstract "Reaction of (dpp-BIAN)Mg(THF)3 (1) {dpp-BIAN = 1,2-bis[(2,6-diisopropylphenyl)imino]acenaphthene} with one molar equivalent of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) proceeds with oxidation of the dpp-BIAN dianion in 1 to the radical-anion and affords the (dpp-BIAN)Mg(TEMPO)(thf) (2) complex. The reaction of dpp-BIAN with an excess amount of magnesium and 0.5 molar equivalents of I2 in Et2O gives (dpp-BIAN)MgI(Et2O)n, which then reacts in situ with (Me3Si)2NK to produce (dpp-BIAN)Mg[N(SiMe3)2](Et2O) (3). Solvent-free magnesium amide (dpp-BIAN)Mg[N(SiMe3)2] (4) was synthesized by treating equimolar amounts of MgI2, dpp-BIAN, and sodium in toluene at reflux followed by treatment with (Me3Si)2NK. Deprotonation of diphenylacetonitrile with [(dpp-BIAN)Mg(μ-Me)]2 (5) produces keteniminate complex (dpp-BIAN)Mg(N=C=CPh2)(Et2O) (6). Complexes 2–4 and 6 were characterized by ESR and IR spectroscopy; their molecular structures were determined by single-crystal X-ray analysis. Compounds 1–3 catalyze the ring-opening polymerization of L- and rac-lactides to give high molecular weight isotactic and stereoblock polylactides correspondingly.(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)" @default.
- W2114937447 created "2016-06-24" @default.
- W2114937447 creator A5007568357 @default.
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- W2114937447 date "2009-11-01" @default.
- W2114937447 modified "2023-10-18" @default.
- W2114937447 title "Magnesium(II) Complexes of the dpp‐BIAN Radical‐Anion: Synthesis, Molecular Structure, and Catalytic Activity in Lactide Polymerization" @default.
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- W2114937447 doi "https://doi.org/10.1002/ejic.200900710" @default.
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