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The crystal structures of sodium 2-iodosyl-4-nitrobenzoate and sodium 2-iodyl-4-nitrobenzoate demonstrate a bicyclic structure for each, pKa, considerations indicate that the anions remain cyclized in solution. The crystal structure of 2-iodyl-5-methylbenzoic acid has also been obtained.
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Katritzky et al. (1990) studied this question.
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