RESUMO
The asymmetric unit of the title compound, C44H44N2O6, contains two independent mol-ecules with similar conformations. The di-hydro-naphthalene ring systems are approximately planar [maximum deviations = 0.036â (2), 0.128â (2), 0.0.24â (2) and 0.075â (2)â Å]. The dihedral angle between two di-hydro-naphthalene ring systems is 83.37â (4)° in one mol-ecule and 88.99â (4)° in the other. The carbonyl O atom is linked with the adjacent hy-droxy and imino groups via intra-molecular O-Hâ¯O and N-Hâ¯O hydrogen bonds. In the crystal, mol-ecules are linked through O-Hâ¯O hydrogen bonds into layers parallel to (001), and adjacent layers are further stacked by π-π inter-actions between di-hydro-naphthalene and phenyl rings into a three-dimensional supra-molecular architecture. In the crystal, one of the isopropyl groups is disordered over two positions with an occupancy ratio of 0.684â (8):0.316â (8).