Yttrium Phosphasalen Initiators for rac-Lactide Polymerization: Excellent Rates and High Iso-Selectivities
Journal of the American Chemical Society2012Vol. 134(51), pp. 20577–20580
Citations Over TimeTop 1% of 2012 papers
Clare Bakewell, Thi‐Phuong‐Anh Cao, Nicholas J. Long, X.F. Le Goff, Audrey Auffrant, Charlotte K. Williams
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 (P(i) = 0.84) or hetero-selectivities (P(s) = 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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