Solid superacid catalyzed organic synthesis. 6. Perfluorinated resinsufonic acid (Nafion-H) catalyzed ring closure reaction of 2,2'-dihydroxybiphenyls. A preparative route to dibenzofurans

Abstract

We report an efficient and mild procedure for the ring closure of 2,2'-dihydroxybiphenyls in the presence of the solid superacid, Nafion-H (a solid perfluorinated resinsulfonic acid) to afford dibenzofuran derivatives in good to moderate yields