title: 31-Benz-yloxy-5,11,17,23,29-penta-tert-butyl-calix[5]arene-32,33,34,35-tetra-ol.
abstract: The title compound, C62H76O5, known to be one of the most versatile synthetic precursors/inter-mediates of calix[5]arene derivatives, adopts an approximate Cs -symmetric cone-in conformation. The aryl-oxybenzyl ring is tilted in such a way that the p-tert-butyl group fills the macrocycle cavity, while the benzyl group moves away from the cavity axis. In the crystal, this conformational arrangement is secured by intra- and inter-molecular O-H⋯O hydrogen bonds forming inversion dimers. Four tert-butyl groups are disordered over two orientations, with occupancy ratios of 0.745 (6):0.255 (6), 0.837 (5):0.163 (5), 0.850 (5):0.150 (5) and 0.845 (8):0.155 (8).
authors.affiliation: Dipartimento di Scienze Chimiche, Università di Messina, Viale F. Stagno d'Alcontres 31, 98166 Messina, Italy.
authors.forename: Claudia
authors.initials: C
authors.lastname: Gargiulli
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Gattuso
authors.forename: Anna
authors.initials: A
authors.lastname: Notti
authors.forename: Francesco
authors.initials: F
authors.lastname: Nicoló
authors.forename: Andrea
authors.initials: A
authors.lastname: Pappalardo