FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing 3,5-disubstituted-2,4,6-triiodophenols of formula (2) 
(where values of radicals R and R' are defined in claim 1). The method is realised via electrochemical generation of I+ cations from a natural iodine source in the presence of a protonic polar in a separate reactor. 3,5-disubstituted phenols are then iodised in the presence of I+ cations obtained at the previous step. The invention also relates to methods of producing compounds of formula (5) 
iopamidol and iomeprol.
EFFECT: improved methods.
15 cl, 8 ex
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