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.
Document type :
Journal articles
Complete list of metadatas

https://hal-polytechnique.archives-ouvertes.fr/hal-00906286
Contributor : Francoise Girard <>
Submitted on : Tuesday, November 19, 2013 - 2:54:27 PM
Last modification on : Tuesday, July 30, 2019 - 8:26:04 AM

Identifiers

Collections

Citation

Clare Blakewell, Thi-Phuong-Anh Cao, Xavier-Frédéric 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⟩

Share

Metrics

Record views

154