par Lebrun, Benjamine ;Braekman, Jean Claude ;Daloze, Désiré
Référence Magnetic resonance in chemistry, 37, 1, page (60-64)
Publication Publié, 1999-01
Référence Magnetic resonance in chemistry, 37, 1, page (60-64)
Publication Publié, 1999-01
Article révisé par les pairs
Résumé : | The 1H and 13C NMR spectra of the 2-methylperhydro-9b-azaphenalene alkaloids characteristic of coccinellid beetles, myrrhine, precoccinelline, hippodamine, their N-oxides and the corresponding hydrochlorides were completely assigned for the first time by a one- and two-dimensional homo- and heteronuclear study (1H, 13C, 1H–1 H COSY, HMQC, HMBC) at 600 and 150.87 MHz. The influence of the ring junction stereochemistry and of the N-oxide function on the proton and carbon chemical shifts in this series of compounds is discussed. Protonation shifts are also considered © 1999 John Wiley & Sons, Ltd. |