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No abstract

Aus den Kondensationsprodukten von Cyclohexanon (I) mit den CH‐aciden Verbindungen (II) werden mit Schwefel nach der Gewald‐Reaktion die Aminothiophene (IV) hergestellt.

The major crystalline components of the heartwood are found to be three iso flavanones: (i) a new compound called 'dalbergioidin' whose constitution is established as 5,7,2',4'- tetrahydroxy iso flavanone, (ii) a known compound, homoferreirin, and (iii) another new com pound called 4 ougenin ’ whose constitution is established as 5,2',4L trihydroxy-7miethoxy- 6 -methyKsoflavanone. The synthesis of ougenin dimethyl ether has been carried out by two methods. The biogenetic relations are discussed. Acetylation of homoferreirin at higher temperatures yields only the acetate of the enol form while at room temperature it gives a mixture of this and the normal acetate.

Aus den Benzoesäuren (I) werden durch Kondensation mit den Phloroglucinen (II) die Xanthone (III) dargestellt.