Reactions of Phenylsilanes with Iron Nonacarbonyl

1996-05-28T00:00:00Z (GMT) by Richard S. Simons Claire A. Tessier
Reaction of equimolar amounts of Fe<sub>2</sub>(CO)<sub>9</sub> and SiPhH<sub>3</sub> yields the triply bridged diiron complex [(OC)<sub>3</sub>Fe]<sub>2</sub>(μ-SiPhH)<sub>2</sub>(μ-CO) (<b>1a</b>). The analogous reaction of Fe<sub>2</sub>(CO)<sub>9</sub> and SiPh<sub>2</sub>H<sub>2</sub> provides the singly bridged diiron complex [(OC)<sub>4</sub>Fe−Fe(CO)<sub>3</sub>(SiHPh<sub>2</sub>)](μ-η<sup>2</sup>-H-SiPh<sub>2</sub>) (<b>4</b>). When <b>4</b> is photolyzed for 12 h, the complex [(OC)<sub>3</sub>Fe]<sub>2</sub>(μ-η<sup>2</sup>-H-SiPh<sub>2</sub>)<sub>2</sub> (<b>5</b>) is obtained. Both <b>4</b> and <b>5</b> exhibit agostic Fe−H−Si interactions. Reaction of Fe<sub>2</sub>(CO)<sub>9</sub> or Fe(CO)<sub>5</sub> with the disiloxane Ph<sub>2</sub>HSi−O−SiHPh<sub>2</sub> gives the singly bridged diiron complex [(OC)<sub>4</sub>Fe]<sub>2</sub>(μ-η<sup>2</sup>-Ph<sub>2</sub>Si−O−SiPh<sub>2</sub>) (<b>6</b>). All compounds have been characterized by <sup>1</sup>H, <sup>13</sup>C, and <sup>29</sup>Si NMR and IR spectroscopy. Compounds <b>4</b>−<b>6</b> have been characterized by X-ray crystallography.