256337-25-4Relevant academic research and scientific papers
Synthesis and properties of chiral ruthenium complexes containing O-, S- and P-functionalized Cp-ligands
Van Der Zeijden, Adolphus A.H.,Jimenez, Jhonny,Mattheis, Chris,Wagner, Christoph,Merzweiler, Kurt
, p. 1919 - 1930 (2007/10/03)
Novel, functionalized, chiral Cp-ligands with S- and P-donor atoms were designed. Together with known analogues containing ether side-chains they were complexed to ruthenium for use as chiral Lewis-acid catalysts. In the ether complexes [RuCl(η5-C5H4CH2CH2OR)(PPh3)2] {R = Me, (1S)- isobornyl, (1R)-menthyl, (1R)-fenchyl} the Cp-ligand is only η5- coordinated; all attempts to provoke a bidentate, Cp/O coordination were unsuccessful. The sulfide complex [Ru{η5:η1-C5H4CH2CH2S[(1R)- neomenthyl]}(PPh3)2][OTf] contains a bidentate Cp/S-coordinated ligand, but it is unstable. The stable phosphane complex [RuCl(η5;η1- C5H4CH2CH(Me)PPh2)[PPh3)] exists as a 77:23 mixture of diastereomers containing a strongly bidentate Cp/P ligand. The diastereomers interchange, with Ru-Cl bond cleavage as the rate-determining step.
