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Scandium and yttrium complexes of an hybrid phenoxy-amidopyridinate ligand. Use in ROP of racemic lactide

Abstract : The new multidentate hybrid phenol-aminopyridine proligand _NMe2NNMe2CiPr2O_H2 (1-H2) was prepared and used in σ-bond metathesis reactions with the trialkyl precursors M(CH2SiMe3)3(THF)2 (M = Sc, Y). These reactions afforded cleanly the corresponding alkyl complexes _NMe2NNMe2CiPr2O_M(CH2SiMe3)(THF) (M = Sc (1-Sc), Y (1-Y)), which were characterized by NMR spectroscopy and microanalysis. Upon crystallization, 1-Sc disproportionates to form the bis(ligand) complex 2-Sc which was isolated and characterized by X-ray crystallography. Complexes 1-Sc and 1-Y were used as initiators in the ring-opening polymerization (ROP) of racemic lactide, alone or in combination with iPrOH, to give atactic PLAs with controlled molecular weights. © 2016 Elsevier B.V.
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Submitted on : Thursday, December 8, 2016 - 3:15:08 PM
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J. El Haj Hassan, V. Radkov, V. Dorcet, J.-F. Carpentier, E. Kirillov. Scandium and yttrium complexes of an hybrid phenoxy-amidopyridinate ligand. Use in ROP of racemic lactide. Journal of Organometallic Chemistry, Elsevier, 2016, 823, pp.34--39. ⟨10.1016/j.jorganchem.2016.09.014⟩. ⟨hal-01381136⟩

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