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A convenient, high-yield (91%) synthesis of [(η 5 -C 5 Me 5 )Ru(NCMe) 3 ]PF 6 ( 4 −PF 6 ) by zinc reduction of [(η 5 -C 5 Me 5 )RuCl 2 ] n ( 1 ) in acetonitrile solution is described. Two acetonitrile ligands of 4 −PF 6 are readily exchanged for either PMe 3 or the chelating diphosphines bis(dimethylphosphino)methane, (2 S,3 S )-bis(diphenylphosphino)butane, or (2 S,4 S )-bis(diphenylphosphino)pentane. The remaining nitrile ligand is still labile, allowing easy access to a number of substitution products [(η 5 -C 5 Me 5 )Ru(PR 3 ) 2 (L)].
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Steinmetz et al. (1999) studied this question.
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