(PMe3)4Ru(H)OAc has been prepared from (PPh3)3Ru(H)OAc via phosphine exchange followed by solvent partitioning between acetonitrile and pentane.  Complexes of the type (PMe3)4Ru(H)R (R = Et, nPr, nBu, iBu) have been prepared through reaction with RMgCl in diethyl ether and were found to be moderately stable provided the alkyl group is primary.  Treatment with bulkier alkylmagnesium chlorides led instead to the dihydrido complex (PMe3)4RuH2, which was also obtained through reaction of the acetate complex with LiAlH4.  In some cases, the reaction with Grignards was complicated by transfer of halide from the organomagnesium reagent to form (PMe3)4Ru(H)Cl.

Synthesis of polyphosphine ruthenium alkyl hydride complexes

243rd National Meeting (2012)

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