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- W2024826051 abstract "Abstract The syntheses of Δ ʌ-, Δ-, and ʌ-[Ru(bpy)2(11,rR-chxn)]2+ (where 1R,2R-chxn=(1R,2R)-(−)-1,2-diaminocyclohexane); rac.-. Δ-, and ʌ-[Ru(bpy)2(chxdiim)2+ (where chxdiim=1,2-diiminocyclohexane); rac.-, and Δ-[Ru(bpy)2(dmen)]2+ (where dmen = N,N′-(dimethyl)ethylenediamine), and rac.-, and Δ-[Ru(bpy)2(dmdiim)]2+ (where dmdiim = N,N′-(dimethyl)ethylenediimine) are described. Oxidation of the coordinated diamines with an acid solution of Ce (IV) and reduction of the coordinated diimines with NaBD4 occur under retention of the configuration at the metal center. Reduction of the diimine complexes with NaBD4 gives back the amines with a diastereomeric excess (ʌ-R,R and Δ-S,S) of 60% in case of chxn as a ligand and 80% for the dmen ligand. The latter becomes a chiral ligand upon deuteration. The reduction also yields a small amount (up to 10%) of the corresponding cis isomers (Δ-R,S/ʌ-S,R). In addition, semi-reduced coordinated amine/imine ligands are observed as intermediates. The identity of the reaction products as well as their configurations has been established by means of circular dichroism and 1H NMR spectroscopy." @default.
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- W2024826051 date "1998-05-01" @default.
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- W2024826051 title "The stereochemistry of the oxidation of diamines and of the reduction of diimines in the coordination sphere of ruthenium(II)" @default.
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