Bozkurt, SKarakucuk, ASirit, AYilmaz, M2020-03-262020-03-2620050040-4020https://dx.doi.org/10.1016/j.tet.2005.08.072https://hdl.handle.net/20.500.12395/19900The synthesis of four diamide derivatives of the p-tert-butylcalix[4]arenes from the reaction of 5,11,17,23-tetra-tert-butyl-25,27diethoxycarbonylmethoxy-26,28-dihydroxycalix[4]arene 2 with various primary amines were reported. The H-1 and C-13 NMR, data showed that the synthesized compounds exist in the cone conformation. The complexing properties of these compounds toward Cr2O72-/HCr2O7- anions are also studied. It has been observed that receptors 5 and 6 are better extractant than the compounds 3 and 4. The protonated alkyl ammonium form of 5 and 6 is an effective extractant for transferring HCr2O7-/Cr2O72- anions from an aqueous phase into a dichloromethane layer. (c) 2005 Elsevier Ltd. All rights reserved.en10.1016/j.tet.2005.08.072info:eu-repo/semantics/openAccesscalix[4]arenedichromate anionssolvent extractiondiamideArticle61441044310448Q2WOS:000232572000002Q2