✍ Scribed by Pierre Granger; Michel Maugras
No coin nor oath required. For personal study only.
Long range coupling constants and 13C chemical shifts are given for the compounds of the title. Evidence of interring coupling is presented. 1 _ introduction The 13C--H spin-spin coupling constants are of great interest in theoretical studies and in the assignment of the 13C resonance [l] _ Numerous results are known especially on direct bonded 13C-H [I 2 ch. IO], but, as far as we know, nobody has ever reported the differents values of long range .JI~~_~ in naphthaiene. with the exception of Giinther et al. [2] ~ who have calculated these parameters directly from the spectrum of naphthalene. We report here our results on this compound and two other derivatives: the l-7 and 2-7 diacetoxynaphthalenes;
the results confirm our interpretation of the naphthalene I%-H coupling constant.
📜 SIMILAR VOLUMES
Long-range coupling constants, "J(C, H), involving the formyl proton or carbon and the carbons or protons of the heterocyclic ring, were measured in the two isomeric formyl-furans and -thiophenes by employing coupled 13C NMR spectra. In furan-2-carboxaldehyde these coupling constants, obtained in so
The NMR parameters characterizing the spectra of trans- and cis-decalins were determined from theoretical calculations and experimental spectra. The calculated values of the shielding constants are in good agreement with the measured chemical shifts, with a small but noticeable difference in accurac