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Starting from 4-hydroxyacridin-9(10H )-one (1) and 4-hydroxyacridine-9(10H)-thione (2), a series of bis-derivatives was prepared, among them the bridged bis-acridin-(10H )-ones 9±14 and the bis-mercapto-(9H)-acridines 15±18. The reactivity of the 2-and 4-hydroxy series was compared; it was found that it is harder to demethylate 4-methoxy derivatives than their 2-methoxy analogues.Reaktion von 4-Hydroxyacridin-9(10H)-on und 4-Hydroxyacridin-9(10H)-thion mit ,x-Alkyldibromiden Zusammenfassung. Ausgehend von 4-Hydroxyacridin-9(10H)-on (1) und 4-Hydroxyacridin-9(10H)-thion (2) wurde eine Serie von bis-Derivaten, unter ihnen die verbru Èckten bis-Acridin-9(10H)-one 9±14 und die bis-Mercapto-(9H)-acridine 15±18, hergestellt. Die Reaktivita Èt der 2-und 4-Hydroxyderivate wurde verglichen; es wurde festgestellt, daû die 4-Methoxyderivate schwerer zu demethylieren sind als die 2-Methoxyderivate.

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