Yttrium phosphasalen initiators for rac-lactide polymerization: Excellent rates and high iso-selectivities

Abstract : Highly active yttrium phosphasalen initiators for the stereocontrolled ring-opening polymerization of rac-lactide are reported. The initiators are coordinated by a new class of ancillary ligand: an iminophosphorane derivative of the popular "salen" ligand, termed "phosphasalen". Changing the phosphasalen structure enables access to high iso-selectivities (Pi = 0.84) or hetero-selectivities (Ps = 0.87). The initiators also show very high rates, excellent polymerization control, and tolerance to low loadings; furthermore, no chiral auxiliaries/ligands are needed for the stereocontrol. The combination of such high rates with high iso-selectivities is very unusual.
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Submitted on : Tuesday, November 19, 2013 - 10:13:31 AM
Last modification on : Tuesday, July 30, 2019 - 8:26:01 AM

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Clare Blakewell, Thi-Phuong-Anh Cao, Nicholas Long, X. Le Goff, Audrey Auffrant, et al.. Yttrium phosphasalen initiators for rac-lactide polymerization: Excellent rates and high iso-selectivities. Journal of the American Chemical Society, American Chemical Society, 2012, 134 (51), pp.20577-20580. ⟨10.1021/ja310003v⟩. ⟨hal-00906007⟩

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