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The synthesis, oxidation reactions and transition metal complexes of a new ferrocenyl-bisphosphine, [Fe{C5H4P(C≡CH)2}2] (1), are described. The reaction of bis(dichlorophosphino)ferrocene with four equivalents of ethynylmagnesium bromide resulted in the formation of  1  in 76% yield. The reaction between  1 , aqueous H 2 O 2  or elemental sulphur produced bis(oxide) and bis(sulfide) derivatives, [Fe{C 5 H 4 P(E)(C≡CH) 2 } 2 ] ( 2  E = O,  3  E = S). Reaction of  1  with [Ru( η6 - p -cymene)Cl 2 ] 2  yielded a diruthenium complex [Fe{C 5 H 4 P(C≡CH) 2 } 2 {RuCl 2 ( η6 - p -cymene)} 2 ] ( 4 ). Treatment of  1  with [M(COD)Cl 2 ] (M = Pd, Pt) resulted in [Fe{C 5 H 4 P(C≡CH) 2 } 2 {MCl 2 }] ( 5  M = Pd,  6  M = Pt). Equimolar reactions between  1  and CuX produced binuclear complexes, [Fe{C 5 H 4 P(C≡CH) 2 } 2 {CuX} 2 ] ( 7  X = Cl,  8  X = Br,  9  X = I).

Synthesis, reactivity and transition metal complexes of 1,1′-bis(diethynylphosphino)ferrocene