Abstract
trans-1,2-Bis(diphenylphosphinoyl)ethylene was treated with (CH 3) 2S(CH 2) in dimethyl sulphoxide and the product reduced with HSiCl 3 to give trans-bis(diphenylphosphino)cyclopropane in 56% overall yield. The new ligand was found to have a strong affinity for AgBF 4 forming a 2/2 complex under conditions where related ligands gave a mixture of 2/2 and 3/2 adducts. This complex could be employed as precursor to a cationic binuclear rhodium carbonyl complex P 2RH 2 +(CO) 3Cl. When synthesis of the coresponding iridium complex was attempted, a soluble yellow adduct of P 2Ir 2(CO) 2Cl 2 and AgBF 4 was obtained, assumed to contain an IrAgIr bond.
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