A new symmetrical dithio peri-bridged naphthalene, dinaphthol[1,8-b,c]-1,5-dithiocin (1) has been synthesized. The cyclic voltammogram of 1 showed one reversible oxidation peak. ESR spectrum of the concd H2SO4 solution of 1 showed the formation of the cation radical. The formation of the dictation of 1 was observed in the reaction of the corresponding monosulfoxide with concd D2SO4 by both high-field H-1 and C-13 NMR spectroscopy.