13C and19F NMR study of α,β-difluorostyryl derivatives of transition metal carbonylates. A method of signal assignment based on the carbon—fluorine spin-spin coupling constants
Abstract:The f3C and 19F NMR spectra of Z-and E-isomers ofl~-X-substituted cq[3-difluorostyrenes (X = F, CI, CpFe(CO) 2, Re(CO)s, Re2(CO)gNa) were studied. Direct and long-range (across I--5 bonds) spin-spin coupling constants and the (13C--12C) isotope shifts in the I~ NMR spectra were determined. The study of the 13C satellites in the tgF NMR spectra of substituted difluorostyrenes permitted assignment of the t3C NMR signals of the vinylic carbon atoms. Similarly, the signals in 19F NMR spectra were assigned based on… Show more
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