Todsapon Thananatthanachon and John R. Bleeke. Washington University in Saint Louis, Saint Louis, MO
Four-coordinated iridium complexes, Ir(PX3)3Cl and Ir(PX3)3CH3 where X = Et and Me, undergo oxidative addition reactions with small silane compounds, HSi(CH3)2(CH=C(CH3)2) and HSi(CH3)2(CH=CH2) under ambient conditions and N2 atmosphere. Six-coordinated iridium complexes are commonly the products obtained by these reactions. We have observed that when a small phosphine group such as trimethylphosphine is chosen as a ligand, the products are obtained very cleanly and tend to be very stable. However, side reactions such as double oxidative addition or phosphine loss are more favorable when triethylphosphine is used due to steric effects. These reactions involving small silane compounds are a good model for future studies of iridium compounds with longer chain silanes such as butadienylsilane, which can potentially yield novel silapentadienyl-iridium compounds or silairidacycles.
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