The Schiff-base aluminium complex [5-Cl-salen]AlOMe (2) is shown to be a room temperature initiator for controlled ring-opening polymerization of D,L- and L-lactides; the molecular structure of the precursor [5-Cl-salen]AlMe (1) reveals a distorted trigonal bipyramidal geometry.
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Cameron et al. (1999) studied this question.