Abstract
The first phosphaalkenyl complex Cp(CO)2Fe-P=C (OSiMe3)(t-Bu) was generated from Cp(CO)2FeP(SiMe3)2 and t-Bu(CO)Cl. In order to test the validity of this synthetic approach, we varied the ring ligand (Cp, C5Me5), the metal (Fe, Ru, Os), the main group element (P, As), and the carbonyl chlorides. The diphosphenyl complexes (C5Me5)(CO)2M-P=P-[2,4,6-t-Bu3C6H2] were obtained from (C5Me5)(CO)2M-P(SiMe3)2 and the corresponding phosphonous chloride. These metallated diphosphenes are easily converted to diphospho-ureas by treatment with Fe2(CO)9.

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