Abstract
Reactions of chiral tetra-azane chelating ligands (1R,2R)-[(NHAr)C6H4CHN]2C6H10 (L1H2 (Ar=2,6-iPr2C6H3); L2H2 (Ar=2,6-Et2C6H3); L3H2 (Ar=2,6-Me2C6H3) with 2 equivalents of ZnMe2 to afford the dinuclear zinc complexes (L1Zn2Me2(1), L2Zn2Me2(2), L3Zn2Me2(3)), respectively. These complexes were characterized by 1H and 13C NMR spectroscopies and elemental analyses. Single crystal X-ray diffraction analyses reveal that complex 1 adopts a trigonal planar geometry around the Zn centers. Subsequent investigations showed that all the zinc complexes were efficient catalysts for the ring-opening polymerization of cyclic esters in the presence of benzyl alcohol in a controlled fashion.
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