Synthesis and characterization of 1,1′-diphospharuthenocenes

Article abstract of DOI:10.1021/om020189i

Reaction of [RuCl₂(cod)]_n (cod = 1,5-cyclooctadiene) with lithium 2,5-dialkylphospholide or 1-stannyl-2,5-dialkylphosphole gives Ru(η⁵-PC₄H₂-2,5-R₂)₂ (R = (-)-menthyl, 4a; or cyclohexyl, 4b). Steric bulkiness of the R groups is a crucial factor for the successful preparation of the 1,1′-diphospharuthenocenes. The structure of the complex 4b was studied by X-ray single-crystal structure determination, which clarified the distance between the nearly planar η⁵-phospholyl ligand and the ruthenium center in the complex, being 1.811 A?.