The anodic oxidation of a-naphthol derivatives lead to the formation of naphthoxenium-ion which in the absence of another nucleophile adds to the ca rboxyl group attached to the side cha in in the 4-pos it i on. I n fact the ring closure product depends on the side chain length and the group attached to the side chain.


E A EL HALEEM ,N ISMAIL ,M EL MOBAYED ,G A EL ENEIN ,