| Abstrakt: |
Chloride abstraction from [Cp*RuCl(PiPr3)] using Na[BArf4] in the presence of BH3·L afforded bidentate σ-borane complexes [Cp*Ru(PiPr3)(η2-BH3·L)][BArf4], where L = quin (N(C2H4)3CH), NMe3, NHMe2, NHiPr2, NH2Me, PMe3, PMe2Ph; Cp* = η5-C5Me5; [BArf4] = [B{3,5-C6H3(CF3)2}4]. In these compounds, the borane ligand is coordinated to the ruthenium atom through two B–H–Ru three-center two-electron bonds. Phosphine–borane complexes exhibit fluxional behavior due to the site exchange between the bridging and terminal BH hydrogen atoms at room temperature. Secondary amine–borane derivatives release H2on heating. BH3·NHMe2and BH3·NHiPr2undergo dehydrogenation even with use of a catalytic amount of [Cp*RuCl(PiPr3)] and Na[BArf4] to ultimately yield [BH2NMe2]2and BH2=NiPr2, respectively.Chloride abstraction from [Cp*RuCl(PiPr3)] using Na[BArf4] in the presence of BH3·L afforded bidentate σ-borane complexes [Cp*Ru(PiPr3)(η2-BH3·L)][BArf4] (L = N(C2H4)3CH, NMe3, NHMe2, NHiPr2, NH2Me, PMe3, PMe2Ph; Cp* = η5-C5Me5; [BArf4] = [B{3,5-C6H3(CF3)2}4]). Secondary amine–borane derivatives release H2on heating. BH3·NHMe2and BH3·NHiPr2undergo dehydrogenation even with use of a catalytic amount of [Cp*RuCl(PiPr3)] and Na[BArf4] to yield [BH2NMe2]2and BH2=NiPr2, respectively. |
