Behaviour of [Ru2(CO)4({µ-MeCO2-O,O′)2(PBun3)2] in the presence of hydrogen: synthesis and X-ray structure of polynuclear ruthenium carbonyl hydrides containing an encapsulated phosphide ligand

Abstract
The compound [Ru2(CO)43-MeCO2-O,O′)2(PBun 3)2] under hydrogen (170 atm), between 140 and 200 °C, undergoes rearrangements. Several phosphine-and phosphide-substituted ruthenium carbonyl hydrides are formed. Among them, [Ru3(µ-H)2(CO)73-PBun)(PBun 3)2], [Ru6(µ-H)6(µCO)(CO)12(µ-PBun 2)(PBun 3)26-P)], and [Ru7(µ-H)8(CO)123-PBun)(µ-PBun 2)-PBun 3)36-P)] were isolated and identified. The X-ray crystal structure analyses performed on the three new products have shown boat metal clusters for the last two, containing an encapsulated phosphide ligand.

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