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  • Title: Synthesis and reactivity of functionalized bridged m-xylylenedioxycalix[6]arenes.
    Author: Galán H, Fragoso A, de Mendoza J, Prados P.
    Journal: J Org Chem; 2008 Sep 19; 73(18):7124-31. PubMed ID: 18700744.
    Abstract:
    The synthesis of A,D-m-xylylene-bridged calix[6]arenes 1-8 functionalized at position 5 of the spacer arm is described. The cone conformation of the new bridged calix[6]arenes has been established by (1)H and (13)C NMR. The X-ray structure of compound 6 confirmed the cone conformation also in the solid state. Compounds 9 and 10, which are branched-like structures, were obtained by reductive amination of 5-amino-A,D-m-xylylene-bridged-B,C,E,F-tetra-O-ethylcalix[6]arene 7 with diformyl calix[4]arene and CTV derivatives 22 and 24, respectively.
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