Abstract
The hydridic complex HRu3(CO)9(⊥-C2But) (Complex 1), containing an acetylide coordinated in perpendicular fashion with respect to one edge of the triangular cluster, catalyzes the hydrogenation of alkynes and of 1,4-cyclohexadiene (1,4-CHD) either under homogeneous and under solid–gas conditions. Cluster catalysis is likely to occur; however, under homogeneous conditions, evidence for partial fragmentation of the cluster has also been found. In these conditions, formation of known metallacyclic compounds and of the new dinuclear derivative Ru2(CO)6 (HC2But)(C2Ph2) (Complex 2a) has been observed: they are presumably inactive byproducts.
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