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Variable temperature magnetic resonance spectra of 1‐fluorocyclooctene
Author(s) -
Weigert Frank J.,
Strobach Donald R.
Publication year - 1970
Publication title -
organic magnetic resonance
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0030-4921
DOI - 10.1002/mrc.1270020310
Subject(s) - pseudorotation , fluorine , ring flip , chemistry , activation energy , spectral line , nuclear magnetic resonance , resonance (particle physics) , nmr spectra database , ring (chemistry) , organic chemistry , atomic physics , physics , astronomy
Variable temperature fluorine magnetic resonance spectra have been obtained for 1‐fluorocyclooctene. At low temperatures both the processes of ring inversion and pseudorotation are slow on the NMR time scale, and two distinguishable conformations can be observed with a free energy difference of 95 cal/mole and a fluorine chemical shift difference of 6·7 ppm. A process with a free energy of activation of 6·1 kcal/mole interconverts the two conformations.