In a previous communication'we described a simple synthesis of 6-methoxy-cu-tetralone (I) which made that compound readily available. The present paper is concerned with the extension of the ring system present in I to that of the two tricyclic ketones (V and VII). In order to effect the desired transformation (I+ V and VII), it was necessary to introduce a butyric acid grouping at the site of the carbonyl group of I. The reaction which appeared ...