Tr. Kasturi et Ka. Kumar, A NEW SYNTHESIS OF DIBENZO[AJ]XANTHENE DERIVATIVES, Indian journal of chemistry. Sect. B: organic chemistry, including medical chemistry, 34(1), 1995, pp. 6-11
Oxidation of mu-H/alkylbisnaphthols (4a-g) gives the 14-substituted di
benzo[aj]xanthenes (5a-g) as the sole product while that of mu-arylbis
naphthols (4h-j) gives the xanthenes (5h-j) along with the correspondi
ng spironaphthalenones (1h-j). A probable mechanism for the formation
of the products has been suggested.