Abstract
The reaction of in situ generated 1′-(diphenylphosphino)-1-lithioferrocene with isocyanates RNCO affords the respective phosphino-carboxamides Ph 2PfcCONHR (fc = ferrocene-1,1′-diyl, R = cyclohexyl ( 2), and Ph ( 3)) in moderate yields. The coordination behaviour of 3 chosen as a representative was studied in palladium(II) and platinum(II) complexes. Depending on the metal precursor and the reaction conditions, the following compounds featuring this ligand as a P-monodentate or an O, P-chelating donor were isolated and characterised by spectroscopic methods (IR, multinuclear NMR and electrospray ionisation MS): trans-[PdCl 2( 3-κ P) 2] ( 5), trans-[PtCl 2( 3-κ P) 2] ( 6), cis-[PtCl 2( 3-κ P) 2] ( 7), [ SP-4-4]-[(L NC)PdCl( 3-κ P)] ( 8; L NC = 2-[(dimethylamino-κ N)methyl]phenyl-κ C 1), and [ SP-4-3]-[(L NC)PdCl( 3-κ 2 O, P)]SbF 6 ( 9). Besides, the crystal structures of a phosphine oxide resulting by oxidation of 2, viz Ph 2P(O)fcCONHCy ( 4), and of complexes 5·2Et 2O and 9 have been determined by single-crystal X-ray diffraction analysis.
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