Abstract
Abstract Zinc complexes supported by NN-bidentate AABn ligand (AABn-H = (E)-N-[2-(benzyliminomethyl)phenyl]-2,6-diisopropylaniline) are synthesized and fully characterized. The reaction of diethyl zinc (ZnEt2) with AABn-H (1.1 mol equiv) yields three-coordinated mono-adduct zinc complex [(AABn)ZnEt] (1). However, treatment of AABn-H with ZnEt2 in the same stoichiometric proportion in the presence of 4-dimethylaminopyridine (DMAP, one equiv) affords [(AABn)Zn(DMAP)Et] (2) as the tetra-coordinated monomeric zinc complex. Bis-adduct complex [(AABn)2Zn] (3) results from treatment of ZnEt2 with AABn-H (two equiv) in refluxing toluene in high yield. Complexes 1 and 3 are efficient catalysts for the ring-opening polymerization (ROP) of e-caprolactone (e-CL) in the presence of alcohol. The “controlled” character of Zn complex 1 also enabled preparation of the PEG-b-PCL copolymer.
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