Facile Conversion of an Appended Silylamido to a Silyloxy Ligand via Isocyanate Elimination. Synthesis of {[(C<sub>5</sub>Me<sub>4</sub>)SiMe<sub>2</sub>O]Zr(η<sup>2</sup>-O<sub>2</sub>CMe)(μ-O<sub>2</sub>CMe)}<sub>2</sub> via the Carboxylation of [(C<sub>5</sub>Me<sub>4</sub>)SiMe<sub>2</sub>(N-<i>t</i>-Bu)]ZrMe<sub>2</sub>

1996-01-09T00:00:00Z (GMT) by Lioba Kloppenburg Jeffrey L. Petersen
The reaction of 2 equiv of CO<sub>2</sub> with [(C<sub>5</sub>Me<sub>4</sub>)SiMe<sub>2</sub>(N-<i>t</i>-Bu)]ZrMe<sub>2</sub> proceeds with the formation of {[(C<sub>5</sub>Me<sub>4</sub>)SiMe<sub>2</sub>(N-<i>t</i>-Bu)]Zr(η<sup>2</sup>-O<sub>2</sub>CMe)(μ-O<sub>2</sub>CMe)}<sub>2</sub> (<b>2</b>), which reacts with additional CO<sub>2</sub> to afford {[(C<sub>5</sub>Me<sub>4</sub>)SiMe<sub>2</sub>O]Zr(η<sup>2</sup>-O<sub>2</sub>CMe)(μ-O<sub>2</sub>CMe)}<sub>2</sub> (<b>3</b>) with the concomitant elimination of OCN-<i>t</i>-Bu. The formation of OCN-<i>t</i>-Bu was confirmed by a combination of GC/MS and IR measurements; the molecular structures of <b>2</b> and <b>3</b> were determined by X-ray crystallography.