RESUMEN
Achiral [Ru2(µ-O2CR)4(MeOH)2](PF6) (R = CH3 or C6H5) reacts with the chiral diphosphines R,R- and S,S-Chiraphos (two chiral centers on ligand between the coordinating P atoms) and R-Prophos (one chiral center on ligand between the coordinating P atoms) leading to a disassembly of the paddlewheel core and the highly diastereoselective production of Λ-[Ru(η(2)-O2CC6H5)(η(2)-R,R-Chiraphos)2](PF6) (Λ-R,R-III), Δ-[Ru(η(2)-O2CC6H5)(η(2)-S,S-Chiraphos)2](PF6) (Δ-S,S-III) (the R = CH3 complexes of Chiraphos were reported in a earlier communication in this journal), and Λ-[Ru(η(2)-O2CCH3)(η(2)-R-Prophos)2](PF6) (Λ-R,R-VI), respectively, in high yield and purity. Reactions of the same starting material with R,R- and S,S-o-tolyl-Dipamp (chiral centers are the coordinating P-atoms) lead to an inversion in the chirality-at-metal producing Λ-[Ru(η(2)-O2CC6H5)(η(2)-S,S-o-tolyl-Dipamp)2](PF6) (Λ-S,S-IV), Δ-[Ru(η(2)-O2CC6H5)(η(2)-R,R-o-tolyl-Dipamp)2](PF6) (Δ-R,R-IV), Λ-[Ru(η(2)-O2CCH3)(η(2)-S,S-o-tolyl-Dipamp)2](PF6) (Λ-S,S-V), and Δ-[Ru(η(2)-O2CCH3)(η(2)-R,R-o-tolyl-Dipamp)2](PF6) (Δ-R,R-V). X-ray crystallography of all but Λ-S,S-V and Δ-R,R-V and solid-state circular dichroism (CD) show that only the indicated diastereomers are present in the solid-state. Solution CD measurements and (31)P NMR also indicate their predominance in solution.
RESUMEN
[Ru(2)(µ-O(2)CCH(3))(4)(MeOH)(2)](PF(6)) reacts with chiral diphosphines (R,R)- and (S,S)-chiraphos, leading to disassembly and production of the enantiomers Λ-[Ru(η(2)-O(2)CCH(3))(η(2)-(R,R)-chiraphos)(2)](PF(6)) and Δ-[Ru(η(2)-O(2)CCH(3))(η(2)-(S,S)-chiraphos)(2)](PF(6)) in high yield and purity. X-ray crystallography and solid-state circular dichroism (CD) show that only the indicated isomers are present in the solid state. Solution CD measurements also indicate their predominance in solution.