The isomerization of carbon–carbon double bonds, a process catalyzed by metal hydride complexes via hydrometalation and subsequent β-hydride elimination, is among the most familiar reactions in transition metal chemistry. 1 Ruthenium hydride complexes are used in such alkene-isomerization reactions, 2–4 in which RuHCl(CO)(PPh 3 ) 3 is the most frequently used catalyst. 3 While the isomerization of secondary unsaturated alcohols to the corresponding saturated ketones ...