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The reactions of N-silylated and free diphenylphosphino thioformaraides, Ph 2 PC(S)NRR′ (R = Ph, Me, Et; R′ = Me 3 Si, H), with CpFe(CO) 2 l yield, by displacement of one equiva­lent CO, both red-brown P,S-coordinated chelate complexes 1 a-c and green P-coordinated iodo complexes 2a-c. With thiocarbamoylphosphine sulfides, Ph 2 P(S)C(S)NHR (R = Ph, Me), the S,S′-coordinated chelate complexes 3a, b are obtained. The corresponding phos­phine oxides only form deeply coloured, weak 1/1 adducts 4a, b with CpFe(CO) 2 l. The course of the nucleophilic substitution of CpFe(CO) 2 X (X = Cl, Br, I) by N-silyl phosphino thioformamides reveals a significant dependence on the halogen employed. For X = Cl, elimination of RNCS and formation of the cationic diiron complex [CpFe(CO) 2 ] 2  _  PPh 2  + Cl -  (5 a) takes place, whereas for X = Br no reaction occurs at room temperature. Mechanistic reasons for this unexpected behaviour are discussed.

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Phosphinsubstituierte Chelatliganden, III [1] η 5 -Cyclopentadienyleisencarbonyl-Koraplexe mit Thiocarbamoylphosphin-, -phosphinsulfid- und -phosphinoxid-Liganden / Phosphine Substituted Chelate Ligands, III [1] η 5  -Cyclopentadienyliron Carbonyl Complexes with Thiocarbamoyl-Phosphine, -Phosphine Sulfide and -Phosphine Oxide Ligands