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.
Y. Ting, W. Verboom, L. C. Groenen, J. van Loon and D. N. Reinhoudt, J. Chem. Soc., Chem. Commun., 1990, 1432 DOI: 10.1039/C39900001432
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