Reactions of Phenylsilanes with Iron Nonacarbonyl

Reaction of equimolar amounts of Fe 2 (CO) 9 and SiPhH 3 yields the triply bridged diiron complex [(OC) 3 Fe] 2 (μ-SiPhH) 2 (μ-CO) ( 1a ). The analogous reaction of Fe 2 (CO) 9 and SiPh 2 H 2 provides the singly bridged diiron complex [(OC) 4 Fe−Fe(CO) 3 (SiHPh 2 )](μ-η 2 -H-SiPh 2 ) ( 4 ). When 4 is photolyzed for 12 h, the complex [(OC) 3 Fe] 2 (μ-η 2 -H-SiPh 2 ) 2 ( 5 ) is obtained. Both 4 and 5 exhibit agostic Fe−H−Si interactions. Reaction of Fe 2 (CO) 9 or Fe(CO) 5 with the disiloxane Ph 2 HSi−O−SiHPh 2 gives the singly bridged diiron complex [(OC) 4 Fe] 2 (μ-η 2 -Ph 2 Si−O−SiPh 2 ) ( 6 ). All compounds have been characterized by 1 H, 13 C, and 29 Si NMR and IR spectroscopy. Compounds 4 − 6 have been characterized by X-ray crystallography.