Abstract Deactivated arenes were mono-or diiodinated with strong electrophilic I+ reagents, which were prepared from NaIO 4 and either I 2 or KI in concentrated H 2 SO 4 (minimum 95% by weight). In general a small excess of the dark brown iodinating solution was used (1.1/1.5 equivalents, for nitrobenzene two equivalents was required). The iodinations were conducted at 25-30 C with a reaction time of 1-2 hours using either a 'direct'or an 'inverse' ...
