✍ Scribed by Miquel Pons; Miguel Feliz; Ernest Giralt
No coin nor oath required. For personal study only.
13 C-NMR spectra of fluorinated molecules are difficult to observe under conventional broad-band proton decoupling. The large coupling constants involved make polarization transfer between fluorine and carbon, using INEPT or DEPT experiments very effective while broad band fluorine decoupling collapses the multiplet pattern. 13 C-NMR spectra of fluorinated compounds are difficult to obtain for several reasons. On
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## Abstract ^13^C and ^19^F NMR spectra of a series of mesogenic compounds, __(S)__‐4‐__n__‐octyloxy‐fluorobiphenyl‐4′‐yl fluoro‐4‐(2‐fluoro‐octanoyloxy)benzoates, were determined in solution. The effect of fluoro substitution in various positions on the ^13^C and ^19^F chemical shifts was studied.
The enflurane and ethoxyflurane 'H, 13C and 19F NMR spectrd are examined-including sign determmatlon of F-F and F-H couphngs-and considered 1n the hght of previously reported results for methoxyflurane Conformat1onal differences between methoxyflurane and the former two molecules dre indicated by th
## Abstract Analyses of the ^1^H, ^13^C and ^19^F NMR spectra of 15 mono‐, di‐, tri‐ or tetrafluoro‐substituted steroids were carried out by two‐dimensional ^1^H^1^H and ^1^H^13^C shift correlation experiments.
The 'H and ''C NMR spectra of several fluorine-substituted polycyclic aromatic hydrocarbons in which fluorine projects into a bay region were studied. Both protons and carbons of the stericaUy opposed CH bond show anomalously large F-induced shifts and couplings to fluorine. The magnitudes of the co