Electrosynthesis and Structural Studies of 5,17-Di-tert-butyl-26,28-dimethoxycalix[4]arene-25,27-diquinone

摘要

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)Å, β = 117.778(4), V = 3368.2(3)Å3, and Z = 4. A structural analysis revealed that this compound crystallises as a solvate with CH₂Cl₂ molecules embedded in pairs of calix[4]arenediquinone.