Regio- and Diastereoselective Nucleophilic Additions of Lithium Enolates on the Allenylidene Complexes [Ru{CCC(R)Ph}(η<sup>5</sup>-C<sub>9</sub>H<sub>7</sub>)(PPh<sub>3</sub>)<sub>2</sub>][PF<sub>6</sub>] (R = H, Ph): Synthesis of the First Chiral Keto-Functionalized (σ-Alkynyl)ruthenium(II) Complexes
Indenylruthenium(II) allenylidene complexes undergo regioselective nucleophilicadditions of lithium enolates at the Cγ atom of the unsaturated chain to afford keto-functionalized σ-alkynyl derivatives. Enolates derived from the chiral ketones (−)-carvone and (+)-pulegone are added regio- and diastereoselectively to give the first chiral keto-functionalized (σ-alkynyl)ruthenium(II) complexes.