Hydrocarbon complexes of iron, ruthenium, and osmium. Part 14. Reactions of a disilicon-chelated carbonylruthenium complex with cyclic polyolefins

Abstract

The complex [[graphic ommitted]iMe₂)(CO)₄] undergoes reactions with cycloheptatriene and cyclo-octatetraene such that one or both silicon atoms of the chelate ligand migrate to the co-ordinated polyolefin. From C₇H₈ the cycloheptadienyl complex [[graphic ommitted]iMe₂)(CO)₂] is produced and converted into the cyclohepta-1,3-diene complex [Ru([graphic ommitted]iMe₂)(CO)₃] upon treatment with CO. Similar behaviour is observed using 7-C₆F₅C₇H₇. Cyclo-octatetraene yields fully migrated [Ru([graphic ommitted]iMe₂)(CO)₃] directly, as well as the diruthenium complex [[graphic ommitted]iMe₂)(CO)₅] containing an unusual η⁷-hydrocarbon ligand bridging the two metal atoms. Cyclopentadiene reacts with [[graphic ommitted]iMe₂)(CO)₄] to give a complex [(CO)₂(η-C₅H₅)RuSiMe₂CH₂CH₂Me₂SiRu(η-C₅H₅)(CO)₂] in which the disilicon chelate links two ruthenium atoms.