Formation and reaction of polyenesulfonic acid. III. Preparation and photoreaction of 1,3,5‐hexatriene‐1,6‐disulfonic acid

As a model for the reaction between polyethylene films and gaseous SO3, n‐hexane was allowed to react with gaseous SO3 to give 1,3,5‐hexatriene‐1,6‐disulfonic acid (HTDS), which was isolated from the reaction products by column chromatography. Furthermore, it was found that an aqueous solution of HTDS‐Na was sensitive to UV, which eliminated one of the sulfonic acid groups by a radical mechanism. sulfonic acids having less than three conjugated double bonds were not sensitive to UV.