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The iodination reactions with using NaIO4 and NaIO3 as the oxidants, proved to be very effective in the case of a number of deactivated arenes, including nitrobenzene and benzoic acid. Pyridine reluctantly enters into an electrophilic substitution reaction, but the presence of an electron-donating NH2-group facilitates the task. Iodination process involves the use of KIO3/KI/AcOH/H2SO4 system. From these reactions we isolated 8 iodinated products in good yields (52-86%).