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Selective modification of calix[4]arenes either by selective dehydroxylation via the reductive removal of phosphate(s), or via the Newman–Kwart rearrangement of 1,3-bis(dimethylthiocarbamoyl)calix[4]arenes yields calix[4]arenes 3 and 1,3-dithiocalix[4]arenes 6, respectively.
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Ting et al. (1990) studied this question.
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