Abstract
The structure of 5,17-di-tert-butyl-26,28-dimethoxycalix[4]arene-25,27-diquinone, obtained by controlled potential electrolysis on a platinum electrode of 5,11,17,23-tetra-tert-butyl-26,28-dimethoxycalix[4]arene-25,27-diol, was determined by an X-ray diffraction method. Preparative oxidation of the calix[4]arene derivative in an acetonitrile solution leads to its corresponding calix[4]arenemonoquinone and calix[4]arenediquinone. 5,17-Di-tert-butyl-26,28-dimethoxycalix[4]arene-25,27-diquinone crystallizes from CH2Cl2 in monoclinic space group P21/a with a = 15.7058(6), b = 14.8399(10), c = 16.3334(9)A, β = 117.778(4), V = 3368.2(3)A3, and Z = 4. A structural analysis revealed that this compound crystallises as a solvate with CH2Cl2 molecules embedded in pairs of calix[4]arenediquinone.
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