Preparation of phosphinoferrocene carboxamides from isocyanates. Synthesis and structural characterisation of palladium(II) and platinum(II) complexes with 1′-(diphenylphosphino)-1-(N-phenylcarbamoyl)ferrocene |
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Authors: | Petr &Scaron těpni?ka,Hana Sola?ová ,Martin Lama?,Ivana Cí sa?ová |
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Affiliation: | Department of Inorganic Chemistry, Faculty of Science, Charles University in Prague; Hlavova 2030, 12840 Prague, Czech Republic |
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Abstract: | The reaction of in situ generated 1′-(diphenylphosphino)-1-lithioferrocene with isocyanates RNCO affords the respective phosphino-carboxamides Ph2PfcCONHR (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-[PdCl2(3-κP)2] (5), trans-[PtCl2(3-κP)2] (6), cis-[PtCl2(3-κP)2] (7), [SP-4-4]-[(LNC)PdCl(3-κP)] (8; LNC = 2-[(dimethylamino-κN)methyl]phenyl-κC1), and [SP-4-3]-[(LNC)PdCl(3-κ2O,P)]SbF6 (9). Besides, the crystal structures of a phosphine oxide resulting by oxidation of 2, viz Ph2P(O)fcCONHCy (4), and of complexes 5·2Et2O and 9 have been determined by single-crystal X-ray diffraction analysis. |
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Keywords: | Ferrocene Carboxamides Isocyanates Palladium Platinum Structure elucidation |
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