| Abstract
| - Complexes [RuX(η3-2-C3H4R)(CO)(P⌒P)] (X = Cl, Br; R = H, Me; P⌒P = dppf, dippf) (2a−dand 3a−d) have been prepared by reaction of the η3-allylruthenium(II) derivatives [RuX(η3-2-C3H4R)(CO)3] (1a−d) with 1 equiv of the appropriate diphosphine. Treatment of 2a−dand 3a−d with HX allows the high-yield preparation of the dimeric compounds [{RuX(μ-X)(CO)(P⌒P)}2] (P⌒P = dppf, X = Cl (4a), Br (4b); P⌒P = dippf, X = Cl (5a), Br (5b)). Complex[{RuCl(μ-Cl)(CO)(dppf)}2] reacts with neutral ligands, via chloride bridge cleavage, affordingthe mononuclear derivatives [RuCl2(CO)(L)(dppf)] (L = CO (6a), BzNC (6b), Py (6c), PhNH2(6d)). The structures of compounds [RuCl(η3-C3H5)(CO)(dppf)] (2a), [{RuCl(μ-Cl)(CO)(dppf)}2](4a), and [RuCl2(CO)(Py)(dppf)] (6c) have been confirmed by X-ray crystallography. Thecatalytic activity of dimers 4a,b and 5a,b in transfer hydrogenation of ketones by propan-2-ol has also been studied.
- η3-Allylruthenium(II) complexes [RuX(η3-2-C3H4R)(CO)(P⌒P)] (X = Cl, Br; R = H, Me; P⌒P = dppf, dippf) have proven to be suitable precursors for the preparation of dimeric compounds [{RuX(μ-X)(CO)(P⌒P)}2] (P⌒P = dppf, X = Cl, Br; P⌒P = dippf, X = Cl, Br) via protonation reactions with HX. These dimers are efficient catalysts in transfer hydrogenation of ketones by propan-2-ol.
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