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Highly active yttrium phosphasalen initiators for the
stereocontrolled
ring-opening polymerization of <i>rac</i>-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 (<i>P</i><sub>i</sub> = 0.84) or hetero-selectivities (<i>P</i><sub>s</sub> = 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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