Transcyclometalation: A Novel Route to (Chiral) Bis-<i>Ortho</i>-Chelated Bisphosphinoaryl Ruthenium(II) Complexes
作者:Paulo Dani、Martin Albrecht、Gerard P. M. van Klink、Gerard van Koten
DOI:10.1021/om000340t
日期:2000.10.1
[RuCl(R−PCP)(PPh3)] (R−PCP = [C6H3CH(Me)PPh2}2-2,6]- (7a), [C6H3CH(Et)PPh2}2-2,6]- (7b), or [C6H2CH2PPh2}2-2,6-SiMe3-4]- (9)) were synthesized using distinct synthetic routes. One of these routes consists of the reaction of the parent arenecompound R−PCHP (i.e., C6H4CH(Me)PPh2}2-1,3 (6a), C6H4CH(Et)PPh2}2-1,3 (6b), or C6H3(CH2PPh2)2-2,6-SiMe3-4 (8)) with [RuCl2(PPh3)3] in 1,2-dichloroethane. Following this
Synthesis of chiral phosphine ligands with aromatic backbones and their applications in asymmetric catalysis
作者:James M. Longmire、Xumu Zhang
DOI:10.1016/s0040-4039(97)00181-0
日期:1997.3
the synthesis of new chiral phosphine ligands has been discovered. A common feature of these ligands is that they contain rigid aromatic backbones which can be used to restrict conformational flexibility. The bite angle of P-M-P can be changed systematically depending on the aromatic backbone. Many asymmetric reactions can potentially be catalyzed by transition metal complexes of these ligands. Moderate
Synthesis and X-ray Crystal Structures of Palladium(II) and Platinum(II) Complexes of the PCP-Type Chiral Tridentate Ligand (1<i>R</i>,1‘<i>R</i>)-1,3-Bis[1-(diphenylphosphino)ethyl]benzene. Use in the Asymmetric Aldol Reaction of Methyl Isocyanoacetate and Aldehydes
作者:James M. Longmire、Xumu Zhang、Maoyu Shang
DOI:10.1021/om980461h
日期:1998.9.1
through reaction of the chiral PCP-type ligand with PdCl2(PhCN)2 and [Pt2(μ-Cl)2(η3-CH2C(CH3)CH2)2], respectively, and their X-raycrystalstructures were determined. Removal of chloride with AgOTf provided an active catalyst species for the asymmetric aldol reaction of methyl isocyanoacetate and aldehydes.