Formation of Novel Trinuclear μ₃-s-cis-η²:η²-1,3-Diene Complexes of Ruthenium Having an Agostic Ru−H−C Interaction. Direct Evidence for Diene Activation in Cooperation with the Three Metal Centers

Trinuclear pentahydride complex [(C 5 Me 5 )Ru] 3 (μ-H) 3 (μ 3 -H) 2 ( 1 ) reacts with 1,3-butadiene or isoprene to form a 1,3-dimetalloallyl complex [(C 5 Me 5 )Ru] 3 (H) 4 (μ 3 -η 3 -C(Me)CHC(R)).