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A Tertiary Phosphonium Salt as a Promoter for the Hydrogenation of CO

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A big promotion: One reason for the irreproducibility that is sometimes found in hydrogenation reactions of CO catalysed by [Ru3(CO)12] in molten [PBu4]Br is the possible presence of [HPBu3]Br, which acts as a promoter by providing a source of HBr.

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