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Isolation and characterization of the chelate exo-nido-ruthenacarborane intermediates formed in the thermal exo-nido-to-closo conversion of [exo-nido-5,6,10-{Cl(Ph3P)2Ru}-5,6,10-(μ-H)3-10-H-7,8-R2-7,8-C2B9H6] (R = H or Me) upon the triphenylphosphine ligand displacement with the chiral (2S,4S)-(−)-2,4-bis(diphenylphosphino)pentane