Abstract
Dimethyl and bis[(trimethylsilyl)methyl] zirconium complexes ([OSSO]ZrR 2) [ 4, R = Me; 5, R = CH 2SiMe 3] having [OSSO]-type bis(phenolato) ligand 1 based on the trans-1,2-cyclooctanediylbis(thio) core have been synthesized by the reactions of the corresponding dichloro zirconium complex 3 with 2 equiv. of MeMgBr and Me 3SiCH 2MgCl, respectively, in Et 2O/toluene at −78 °C. The molecular structures of these complexes 3– 5 were characterized by NMR spectroscopy, elemental analyses, and X-ray crystallography. 1H and 13C NMR data of complexes 3– 5 exhibited that they took the C 2-symmetry in solution in the NMR time scale. In the crystal structures of 3– 5, each zirconium center lies at the center of a distorted octahedral coordination sphere with cis sulfur atoms and trans oxygen atoms, which adopts a cis- α [( Λ ∗, S ∗, S ∗)] configuration.
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