Formation of a Dynamic η<sup>2</sup>(<i>O</i>,<i>N</i>)-Hydroxylaminato Zirconocene Complex by Nitrosoarene Insertion into a Zr−C σ-Bond

The reaction of dimethylzirconocene with nitrosobenzene gave the hydroxylaminatozirconium complex <b>6</b>. Its structure in the solid state was characterized as the N-inside isomer [η<sup>2</sup>(<i>O</i>,<i>N</i>)-ON(CH<sub>3</sub>)Ph](CH<sub>3</sub>)ZrCp<sub>2</sub> (<b>6a</b>) by X-ray diffraction. Dynamic <sup>1</sup>H NMR spectroscopy indicated a rapid enantiomerization process of the chiral system <b>6a</b> in solution, probably taking place via a rapid equilibration with a reactive η<sup>1</sup>(<i>O</i>) isomer.