ChemInform Abstract: Small and Medium Rings. Part 65. The Vinylogous Tricarbonyl Chromophore. Violerythrine End Groups and Related Six‐Membered Ring Compounds. Their Synthesis, Conformation, and Investigation by Photoelectron, UV, and NMR Spectroscopy and by Crystal Structure Analysis.

Abstract

The five‐ and six‐membered rings (II), (V), (VII) and (VIII) containing the structural moiety 3‐pentene‐1,2,5‐trione are prepared by SeO2 oxidation of (I), (III), (VIa), (VIb) or (VId).