Abstract
A series of pyrrolylaldiminato ligands and the corresponding five-member-chelate aluminum complexes were prepared and characterized. These metal complexes contain side arms bearing oxygen, sulfur and SO2 moieties, which can influence their catalytic properties. In the presence of one equivalent of benzyl alcohol initiator, these complexes can initiate well-controlled ring opening polymerization of ε-caprolactone with high activities. Most interestingly, the well-controlled behavior was maintained in the absence of the benzyl alcohol initiator.
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