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- W2019975840 abstract "Combination of upper-rim-1,3-difunctionalized calix[4]arenes 14, 16, and 18 with tribridged resorcinarenes 4 and 6 and A,C-di-bridged resorcinarenes 10 and 13 yields both 1/1 calix-resorcinarenes (22–24) and 2/1 calix-resorcinarenes (25, 26). 1/1 Calix-resorcinarene 22 mainly exists as one conformer (a), but at low temperatures (−60°C) very small amounts ( < 5%) of a second conformer (b) can be observed. Both conformers equilibrate via rotation about one of the C(arene)-N bonds, with an activation free energy (Δ G≠) of 13 kcal/mol. 2/1 Calix-resorcinarenes 25 and 26 are more flexible and exist as a mixture of conformers. In order to be able to rigidify the structure of 2/1 calix-resorcinarenes via rigid spacers between the calix[4]arene fragments, 1,3-diaminocalix[4]arene derivatives 31, 32, and 34 were synthesized carrying nitro, carboxylic ester, and cyano groups at the unsubstituted aromatic rings. With these calix[4]arene derivatives, three new, functionalized 2/1 calix-resorcinarenes 35–37 have been synthesized." @default.
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- W2019975840 date "2010-09-02" @default.
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- W2019975840 title "Synthesis of potential receptor molecules by combination of upper-rim-functionalized calix[4]arenes and partly bridged resorcinarenes" @default.
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