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1Results and DiscussionIn order to bring evidence for or against the hypothesis of catalytic hydrogenation by intact trinuclear arene ruthenium clusters containing an oxo cap, the substrate being hydrogenated inside the hydrophobic pocket spanned by the three arene ligands ("supramolecular cluster catalysis")[1], we synthesized cationic Ru3O clusters (See Fig. 1) with three different arene ligands (intrinsically chiral tetrahedra).