AI Article Synopsis
- Researchers developed highly effective yttrium phosphasalen initiators for the stereocontrolled ring-opening polymerization of rac-lactide.
- The new initiators use a modified "salen" ligand called "phosphasalen," allowing for high levels of selectivity (85% iso-selectivity and 87% hetero-selectivity).
- These initiators offer rapid polymerization, excellent control over the process, and don't require additional chiral agents for stereocontrol, making them a unique and efficient option for polymer synthesis.
Article 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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| http://dx.doi.org/10.1021/ja310003v | DOI Listing |
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