P2J3 – ein neuartiger Komplexligand

P₂J₃ – a New Complex Ligand P₂J₄ and Na₂Cr(CO)₅ react in benzene to the monomeric diamagnetic complex (CO)₄CrP₂J₃. The ³¹P-nmr spectrum shows the presence of different bonded phosphorus atoms. The exchange of one iodine atom between the P atoms leads to a temperature dependent equilibrium with a symmetrical transition state. Triphenyl- and tricyclohexylphosphine react with (CO)₄CrP₂J₃ to (CO)₄CrPJ₂ · P(C₆H₅)₃ resp. (CO)₄CrPJ₂ · P(C₆H₁₁)₃, probably of dimeric nature.