25,26,27,28-Tetrakis(3-bromobenzyloxy)calix[4]arene

In the title compound, C56H44Br4O4, the calix[4]arene unit displays the 1,2-alternate conformation with crystallograpically imposed inversion symmetry. The four phenoxy rings of the calix[4]arene unit are twisted about the mean plane defined by the four methylene C atoms bridging the benzene rings, with dihedral angles of 46.73 (6) and 66.11 (5)°. The dihedral angle between adjacent phenoxy rings is 74.75 (7)°. The two pendant bromophenyl rings on the same side of the calix[4]arene unit are nearly perpendicular to each other, with a dihedral angle of 72.85 (10)° due to an intramolecular C—H⋯π interaction. In the crystal, a Br⋯Br contact of 3.6350 (5) Å, an intermolecular C—H⋯Br hydrogen bond and an intermolecular C—H⋯π interaction are observed.