Synthesis And Structure Of A Diphosphonite-Bridged Ruthenium Dication, {[(P-Cymene)Ru(Mu-Cl)](2)(Mu-1,2-Di(2 ' 2 '-Diethyl-1 ',3 '-Propanedioxy)-Phosphinoethane)}(2+)

Attempted synthesis of [(p-cymene)Ru(PP)](2+) (PP = 1,2-di(2'2'-diethyl-1',3'-propanedioxy)phosphinoethane) by reaction of [(p-cymene)RuCl2](2) with PP followed by chloride abstraction with AgSbF6 afforded instead the diphosphonite-bridged Ru-II dimer, {[(p-cymene)Ru(mu-Cl)](2)(mu-PP)}[SbF6](2), which was structurally characterized. A neutral intermediate, [(p-cymene)RuCl2](2)-(mu-PP), was isolated and was converted to the latter by treatment with AgSbF6.