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Beilstein J. Org. Chem. 2023, 19, 764–770, doi:10.3762/bjoc.19.56
Graphical Abstract
Scheme 1: Bromination of endo-7-bromonorbornene.
Figure 1: Structure 6 (our assignment) and structure 7 revised by Novitskiy and Kutateladze.
Figure 2: W or M orientaition in norbornane and the corresponding coupling constants.
Figure 3: The determined structure 6 by NMR experiments and the proposed structure 7 by computional NMR.
Figure 4: The normal and expanded 1H NMR spectra of compound 6.
Figure 5: γ-Gauche effects caused by bromine atoms in 3, 5, and 6.
Figure 6: NOE-Diff experiment. Double resonance experiment. Irradiation at the resonance frequency of protons...
Figure 7: NOE-Diff experiment. Irradiation at the resonance frequency of proton H7 (4.23 ppm).
Scheme 2: Our mechanism suggested for the formation of 6 [4].
Scheme 3: The mechanism suggested by Novitskiy and Kutateladze for the formation of 7 [3].
Figure 8: A) Molecular structure of the compound 6 with displacement ellipsoids drawn at the 30% probability ...