Since aromatics can undergo sulfonation in concentrated sulfuric acid,'the question arises whether the substrates become sulfonated during the course of direct polyiodinations. Such sulfonated intermediates would be deactivated toward subsequent iodination but would not be expected to be inert, since iodination can proceed on deactivated substrates such as nitrobenzene and benzoic acida2 We did not observe sulfonated products in our earlier ...
