organic compounds
Open access
The asymmetric unit of the title compound, C20H18N2O2, contains two independent molecules in which the dihedral angles between the naphthalene ring system [r.m.s. deviations = 0.012 (1) and 0.015 (1) Å] and the benzene ring are 71.65 (6) and 74.51 (6)°. In the crystal, pairs of N—HO hydrogen bonds form two independent inversion dimers with graph-set notation R22(14). In addition, each molecule contains an intramolecular O—HN hydrogen bond with an S(6) motif.
data reports
Open access
In the title compound, C17H14O5, the dimethoxy-substituted benzene ring is twisted relative to the 4H-chromenon skeleton (r.m.s. deviation = 0.015 Å) by 5.2 (4)°. The C atoms of the methoxy groups lie close to the plane of their attached benzene ring [deviations = 0.036 (3) and 0.290 (3)Å for the meta and para substituents, respectively]. An intramolecular O—HO hydrogen bond closes an S(5) ring. In the cystal, inversion dimers linked by pairs of O—HO hydrogen bonds generate R22(10) loops and C—HO interactions connect the dimers into [010] chains.