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By E. CLAR, W. KELLY, D. G. STEWART, and (in part) J. W. WRIGHT. Dinaphthyloxyanthraquinone (I) was condensed in a sodium chloridealuminium chloride melt to the polycyclic oxides (11), (111), and (IV). Reduction of one of these ( 111), with hydriodic acid and red phosphorus followed by dehydrogenation with palladium charcoal gave benzo[u]perylene (VI) , which was also obtained from dinaphthylanthracene (V) by drastic treatment in a sodium chloride-aluminium melt. If the ring closure of 9 : 10-dihydro-9 : 10-dihydroxy-9 : 10-di-1'-naphthylanthracene (IX) was carried out under milder conditions, 3-l'-naphthylbenzo[a]perylene (VIII) was formed. This compound was also obtained by ring closure of 1-chloro-9 : 1O-di-l'naphthylanthracene.

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