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Yttrium Phosphasalen Initiators for rac-Lactide Polymerization.

Abstract : A series of highly active yttrium phosphasalen initiators for the heteroselective ring-opening polymerization of rac-lactide are reported. The initiators are yttrium alkoxide complexes ligated by iminophosphorane analogues of the popular "salen" ligand, termed "phosphasalens". A series of novel phosphasalens have been synthesized, with varying substituents on the phenoxide rings and ethylene, propylene, rac-cyclohexylene, R,R-cyclohexylene, phenylene, and 2,2-dimethylpropylene groups linking the iminophosphorane moieties. Changing the substituents on the phosphasalen ligands results in changes to the rates of polymerization (kobs) and to the PLA heterotacticity (Ps = 0.87). Generally, the initiators have high rates, excellent polymerization control, and a tolerance to low loadings.
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Submitted on : Tuesday, November 19, 2013 - 2:54:27 PM
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Clare Blakewell, Thi-Phuong-Anh Cao, X. Le Goff, Nicholas Long, Audrey Auffrant, et al.. Yttrium Phosphasalen Initiators for rac-Lactide Polymerization.. Organometallics, American Chemical Society, 2013, 32 (5), pp.1475-1483. ⟨10.1021/om301129k⟩. ⟨hal-00906286⟩



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