521058-90-2Relevant academic research and scientific papers
Fluxional and rigid (trimethylphosphane)cobalt complexes containing chelating (2-diphenylphosphanyl)anilido ligands
Klein, Hans-Friedrich,Beck, Robert,Floerke, Ulrich,Haupt, Hans-Juergen
, p. 240 - 248 (2007/10/03)
2-(Diphenylphosphanyl)anilines (P/NHR) eliminate methane upon reaction with [CoMe(PMe3])4] forming the complexes [Co(η2-P/NR)(PMe3)3] (1: R = H; 2: R = Me) and [Co(η2- P/NR)(PMe3)2] (3: R = Me). Reaction with HCl gives [CoCl(η1-P/NHR)(PMe3)2] (4: R = H; 5: R = Me) and reaction with CO or olefin gives [Co(η2-P/NR)(CO)(PMe3)2] (6: R = H; 7: R = Me) and [Co(η2-P/NR)(olefin)(PMe3)2] (8: R = H, olefin = C2H4; 9: R = Me, olefin = C2H4; 10: R = Me, olefin = C3H6), respectively. No catalytic transformation of the olefins was observed. Oxidation by iodomethane yields a cobalt(II) compound [CoI(ν2-P/NR)(PMe3)2] (11: R = Me). By treating 2 -(diphenylphosphanyl)aniline with [CoMe2(PMe3)3] a methylcobalt(II) complex [CoMe(η2-P/NR)(PMe3)2] (12: R = H) is obtained, while an excess of the aniline produces [Co(η2-P/NR)2] (13: R = H; 14: R = Me) or [Co(η2-P/NR)2(PMe3)] (15: R = H; 16: R = Me). The methylcobalt(III) complexes mer-trans-[CoIMe2(η2-P/NR) (PMe3)2] were obtained from LiP/NR and [CoClMe2(PMe3)3]. Dynamic 31P NMR spectra and the structures of complexes 3, 6, 12, and 13 are discussed. Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.
