Neuartige Merocyanine vom Typ des «Bindons»

The title compounds (new type of merocyanines) were obtained from the reaction of heterocyclic enamines with indan-1,3-dione, biindantrione, 2-(3-methoxy-inden-1-yliden)-indan-1, 3-dione, or 2-(3-chloro-inden-1-yliden)-indan-1, 3-dione respectively. The enamines were obtained from the corresponding quaternary salts and reacted in situ.