This paper presents a new convenient route to prepare osmafuran starting from readily accessible HC≡C CH(OH)C≡CH and OsHCl(CO)(PPh3)3.Treatment of a solution of OsHCl(CO)(PPh3)3 in dichloromethane with HC≡C CH(OH)C≡CH,followed by the addition of acetic acid,produced osmafuran [Os(CHC(PPh3)CO(CH2CH3))Cl(CO)(PPh3)2]Cl(2).2 has been isolated in good yield and fully characterized.1H and 13C NMR spectra show the characteristic downfield chemical shifts of the ring hydrogen and carbon atoms.NMR and X-ray diffraction data provide strong evidence for the aromatic nature of 2.Probably due to the effect of the phosphonium substituent,2 exhibits remarkable thermal stability,air stability and lower reactivity.
ZHANG Hong,LIN Ran,LUO Ming & XIA HaiPing State Key Laboratory for Physical Chemistry of Solid Surfaces
