Benzyltrimethylammonium dichloroiodate (BTMA·ICl2) is recommended as a new iodinating reagent for the phenolic units in calix[4]arenes. Using a mercury salt method for the iodination of calix[4]arenes with free phenolic units the formation of quinones was observed as a side reaction.
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Klenke et al. (1998) studied this question.
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