Indenyl-RhL2 species are efficient catalysts in the cyclotrimerization reaction of alkynes to give substituted arenes. The syntheses and X-ray structures of the two bimetallic complexes, trans-Cr(CO)3-heptamethylindenyl-Rh(COD) and trans-Cr(CO)3-heptamethylindenyl-Rh(CO)2, are reported. The contemporary coordination of the benzene ring with Cr(CO)3 and permethylation of the indenyl ligand enhance substantially the reaction rate of the trimerization and the stability of the catalyst. Best results were obtained when the bidentate cycloocta-1,5-diene was used as an ancillary ligand.
Heterobimetallic heptamethylindenyl complexes of Cr0 and RhI: Trans-[Cr(CO)3-indenyl*-RhL2] (L2 = COD, L = CO)
CECCON, ALBERTO;SANTI, SAVERIO;
1994
Abstract
Indenyl-RhL2 species are efficient catalysts in the cyclotrimerization reaction of alkynes to give substituted arenes. The syntheses and X-ray structures of the two bimetallic complexes, trans-Cr(CO)3-heptamethylindenyl-Rh(COD) and trans-Cr(CO)3-heptamethylindenyl-Rh(CO)2, are reported. The contemporary coordination of the benzene ring with Cr(CO)3 and permethylation of the indenyl ligand enhance substantially the reaction rate of the trimerization and the stability of the catalyst. Best results were obtained when the bidentate cycloocta-1,5-diene was used as an ancillary ligand.
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