H‐NMR‐spektrometrisch läßt sich ein oszillierender Austausch (Frequenz etwa 1000 Sek." bei 100°C) der Acyl‐ bzw. Aroyl‐Gruppen in den Enolestern (I) und (II) nachweisen; die Acyl‐ und Aroyl‐Gruppen des Tropolonderivats (III) und der Acetylacetondiimine verhalten sich gleichartig.
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