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- Les ions iodure sont transformés par la thyroperoxydase : 2I- -> I2 -> 2I+- Les ions iodonium se fixent spontanément par attaque électrophile de la double liaison du cycle aromatique (sans aide enzymatique) du résidu tyrosyl de la thyroglobuline (avec élimination de H+ et formation transitoire d'un pont).- Les résidus tyrosyls iodés vont réagir avec du H2O2 produit par la peroxydase donnant des radicaux libre sur les oxygène des résidus tyrosyls.- L'électron libre va dans un cas de déplacer au carbone opposé dans le cycle = C° par résonnance. Dans l'autre cas, o° va permettre d'attaquer le C° précédent, ce qui superpose les deux cycles = couplage par formation d'un pont éther.
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