13C-NMR-spektroskopische Untersuchung einfach substituierter Flavyliumsalze

✍ Scribed by Dr. M. Gruner; Prof. Dr. H. Hartmann; Dr. P. Czerney; Dr. R. Hultzsch

• Publisher: John Wiley and Sons
• Year: 1990
• Tongue: English
• Weight: 583 KB
• Volume: 332
• Category: Article
• ISSN: 1615-4150
• DOI: 10.1002/prac.19903320406

✦ Synopsis

^13^C‐N.M.R. Spektroscopical Studies on Simply Substituted Flavylium‐Salts

On a series of differently substituted flavyliumsalts 1‐3 their ^13^C‐NMR‐chemical shifts and their ^1^J(^13^CH) coupling constants were recorded and compared with results received by means of semiempirical PPP calculations and using LFE relationships. Both the experimental and theoretical results exhibit concordantly a characteristic alternate electron distribution along the conjugated π‐system of the compounds studies and reveal the distinct influence of donor and acceptor substituents on the electron distribution in both the benzopyrylium and the aryl moiety of the flavylium salts studied.