Cr(CO)3(μ-η:η-indenyl)Rh(η4-COD) displays higher reactivity than (indenyl)Rh(η4-COD) both as catalyst in cyclotrimerization reactions of alkynes and in ligand substitution reactions. These results can be explained on the basis of the coordinative flexibilty which arise from the simultaneous coordination of the two metals at the indenyl ligand. The reactivity is correlated to the slippage of chromium and rhodium from an unreactive η6-bonding mode to η4 and η3 ones, respectively.
On different chemical and catalytic behavior of (η-indenyl)-Rh(η4-COD) and Cr(CO)3(μ-η:η-indenyl)Rh(η4-COD) complexes
CECCON, ALBERTO;SANTI, SAVERIO;
1991
Abstract
Cr(CO)3(μ-η:η-indenyl)Rh(η4-COD) displays higher reactivity than (indenyl)Rh(η4-COD) both as catalyst in cyclotrimerization reactions of alkynes and in ligand substitution reactions. These results can be explained on the basis of the coordinative flexibilty which arise from the simultaneous coordination of the two metals at the indenyl ligand. The reactivity is correlated to the slippage of chromium and rhodium from an unreactive η6-bonding mode to η4 and η3 ones, respectively.
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