CHIRALITAETSEIGENSCHAFTEN VON MONO(η-CYCLOPENTADIENYL)THIOBENZAMIDATOZIRCONIUM(IV)-KOMPLEXEN

Article abstract of DOI:10.1016/0022-328X(84)85008-1

The (η-cyclopentadienyl)diarylthiobenzamidatozirconium(IV) complexes (CpZrAr2(NRCAr=S) 7 and 8) are formed upon reaction of (η-cyclopentadienyl)tris-p-tolyzirconium(IV) (4) with benzyl- or 1-phenylethyl-isothiocyanate, respectively.It is shown by NMR analysis that these compounds have achiral mplecular geometries, but the reaction product of 4 with two molar equivalents of benzylisothiocyanate is chiral.Presumably different coordination modes of the substituted thiobenzamidato ligands cause the metal chirality observed for this complex.A rapid intramolecular degenerating rearrangement (ΔG(excit.)_{50 deg C} 16 kcal mol^-1) proceeding with loss of the metal chirality is shown by dynamic NMR spectroscopy.