Selective and very convenient methods of iodination of calix[4]arenes using ICl or NIS have been demonstrated, preparing mono(p-iodo) and 1,3-di(p-iodo) derivatives of calix[4]arenecrown-4 and -5, as well as mono(p-iodo) derivative of tris(O-propyl)calix[4]arene in good yields.
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Gunji et al. (1998) studied this question.
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