Fluorine magnetic resonance studies: I. Para-substituted β,β-difluorostyrenes

Abstract

A series of seven para-substituted β,β-difluorostyrenes has been prepared and their proton and fluorine magnetic resonance spectra recorded. The fluorine spectra show interesting correlations with the α− values for the para substituents, the fluorine resonances moving to lower field and the geminal fluorine-fluorine coupling constant decreasing as α− increases. These trends parallel those observed in the analogous styrenes but rather more precise relationships have been established for the fluorine compounds. Long range fluorine-fluorine spin-spin coupling over six and seven bonds, respectively, has been observed in the β,β,β, 3- and β,β, 4-trifluoro-styrenes. © 1972, CSIRO. All rights reser..