title: Diastereoselective synthesis and coordination chemistry of enantiopure keto-bis-(2-phosphametallocene)s.
abstract: Enantiopure 2-(chlorocarbonyl)phosphametallocenes [MCp*(2-{COCl}-3,4-Me(2)-5-Ph-PC(4))] (M = Fe, Ru) react with phospholide anions to give 2-phosphametallocene-2'-acylphospholides K[MCp*(2-CO-2'-{3',4'-Me(2)-5'-PhPC(4)}-3,4-Me(2)-5-Ph-PC(4))] (M = Fe, Ru) and these have been converted into keto-bis-(2-phosphametallocene)s through reaction with [FeClCp*(tmeda)]; templation of this process with CuBr gives rise to the C(2)- (or pseudo-C(2)- when M = Ru) symmetric form of [{MCp*(3,4-Me(2)-5-Ph-PC(4))}(2)-2,2'-(CO)] (M = Fe, Ru; Fe, Fe) with high (>95%) diastereoselectivity. X-Ray structures of these ligands coordinated to [RuCp*Cl] and [PtCl(2)] centres show that the spatial orientation of the very flexible keto-bis-(2-phosphametallocene) structure is highly responsive to the coordination sphere of the chelated platinum or ruthenium centre.
authors.affiliation: Laboratoire Hétéroéléments et Coordination Ecole Polytechnique, CNRS, 91128, Palaiseau cedex, France. Duncan.Carmichael@polytechnique.edu
authors.forename: Duncan
authors.initials: D
authors.lastname: Carmichael
authors.forename: Xavier F
authors.initials: XF
authors.lastname: le Goff
authors.forename: Eric
authors.initials: E
authors.lastname: Muller
authors.forename: Louis
authors.initials: L
authors.lastname: Ricard
authors.forename: Marek
authors.initials: M
authors.lastname: Stankevič