Reactivity of ruthenium polyhydrides: reactions of RuH6[P(C6H11)3]2 with C5-cyclic hydrocarbons. Preparation of new ruthenium(IV) trihydrides RuH3(C5Me5)L [L = PMe3, PPh3, PPri3, or P(C6H11)3]

Abstract

The hydrides RuH₂(C₅H₆)(Pcy₃)₂(2) and RuH(C₅H₅)(Pcy₃)₂(3)(cy = cyclohexyl) are formed in the reaction of RuH₆(Pcy₃)₂(1) with cyclopentene, although in the presence of 3,3-dimethylbut-1-ene only (3) is formed quantitatively, but treatment of (1) with C₅Me₅H gives no C₅Me₅ complex (although in C₆D₆ active H–D exchange with the phosphine protons is observed); however [Ru(C₅Me₅)Cl₂]_n when treated with phosphine (L = PMe₃, PPh₃, PPrⁱ₃, or Pcy₃) gives the paramagnetic complexes RuCl₂(C₅Me₅)L, which on treatment with LiBHEt₃ in tetrahydrofuran yields the new trihydrides RuH₃(C₅Me₅)L.