Hydrogénation de sels de flavylium: formation de composés heptacycliques; structure radiocristallographique du [tétrahydro‐10b,10c,16,16a‐diméthyl‐16,16a‐méthylène‐10b,16‐5aH‐di(benzo[1]pyranno)[4,3‐b:3′,4′,‐c;2,3:2′,3′]‐benz[1]oxépinyl‐5a]‐2‐phénol

Abstract

Hydrogenation of Flavylium Salts: Formation of Heptacyclic compounds; X‐Ray Crystal Structure of 2‐[10b,10c,16,16a‐Tetrahydro‐16,16a‐dimethyl‐10b,16‐methylene‐5aH‐di[1]benzopyrano[4,3‐b:3′,4′ ‐c; 2,3:2′,3′][1]benzoxepin‐5a‐yl]phenol The hydrogenation of flavylium salts 1 either by catalytic reduction or by chemical reduction afforded the unexpected heptacyclic compound 2, the structure of which was determined by X‐ray analysis. The latter was confirmed by 1H‐NMR and mass spectra.