t Analogous dimeric cations are formed with P(OR),Ph, P(OR)Ph, ( R = Me or Et),g and P(OR), (R = Me or Et) lo by reaction of [(RuC1,(C7H8)),] with excess of ligand and Na[BPh,] in methanol. $ Recent examples include [RuCl,{P(C,H,Me-p) 3)3 and ,I, l6 [RuCl,{PMe,(CH,Ph)),], l7 and [ RuCl,(PF,),(PPh,) ,] .I8 5 In ref. 1 we erroneously formulated these as monomeric [RuX,L,] species on thc basis of elemental analyses alone.

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Reaction of [RuCI,(PPh,),] with [Ru(CO)Cl,(dmf)(PPh,),] in acetone (1: 1 molar ratio) (dmf = NN-dimethylformamide) gives a high yield of [(Ph,P),CIRuCI,Ru(CO) (PPh3),]*2Me,C0, supporting the mechanism proposed

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