19F NMR chemical shifts of n-F-alkyl compounds

Fluorine magnetic resonance spectra of monofluoro- and difluoro-substituted hydrocarbons

“…fluorine NMR because of the larger data base available.411 Fluorine spectroscopists have previously chosen perfluorocarbons as their "simple" model compounds. 5,6 Unfortunately, this corresponds closely to choosing poly-(tetramethylethylene) instead of polyethylene as the unsubstituted standard to which substituents would be compared in carbon NMR. Correlations could be developed, but at least in carbon NMR, pairwise interactions have been shown to dominate in this situation.…”

Access to Polyfluorinated Tetrahydropyranyl Amides via Prins‐Ritter Cyclization under Green Conditions

“…However, the 4‐chloro‐substituted THPs were found to be less reactive, even after several days of heating ( 9 a‐b ). The E / Z selectivity varied between 75 and 89% in favour of the more stable E isomer, as determined by the CF 2 α chemical shift inF NMR (‐111,5 for the E isomer and −106,7 for the Z isomer) . The major and more polar E isomer could be separated from the Z isomer in all cases.…”

Microbial Synthesis of Poly(β-hydroxyalkanoates) Containing Fluorinated Side-Chain Substituents

“…Observation of Figures and shows the phenyl and trifluoromethyl resonances, respectively, due to trifluorotoluene. The 19 F spectrum of the product also shows four additional 19 F signals at −126.5, −124.8, −115.1, and −81.4 ppm that were assigned to fluorine nuclei 3 (F-3), F-2, F-1, and F-4 of the NF3HNA repeat units (see Figure ) based on 19 F spectral assignment made by others on related structures . The moles of repeat units with fluorinated side groups was determined from the 19 F spectra by measuring the relative integration of the trifluoromethyltoluene signal at −63.2 and the signal due to CF 3 (F-4 in Figure ) at −81.4 ppm.…”

“…The 19 F spectrum of the product also shows four additional 19 F signals at -126.5, -124.8, -115.1, and -81.4 ppm that were assigned to fluorine nuclei 3 (F-3), F-2, F-1, and F-4 of the NF3HNA repeat units (see Figure 4) based on 19 F spectral assignment made by others on related structures. 42 The moles of repeat units with fluorinated side groups was determined from the 19 F spectra by measuring the relative integration of the trifluoromethyltoluene signal at -63.2 and the signal due to CF 3 (F-4 in Figure 4) at -81.4 ppm. The total moles of repeat units was determined by comparison of the relative signal intensities of the 1 H signal due to trifluorotoluene (five hydrogens) and the methine protons (one hydrogen) H-2, H-10, and H-16 whose signals were not resolved.…”