The non-H atoms of the title compound, C20H20N2O2, is located on a mirror plane except two methyl groups of the tert-butyl group. Intra-molecular N-H⋯O hydrogen bonds exist between the hy-droxy and diazenyl groups. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds into supra-molecular chains running along the a-axis direction.

The title compound, C(21)H(20)BrNO(2), was obtained from a condensation reaction of 4-bromo-benzaldehyde, 2-naphthol and morpholine. The mol-ecular conformation is stabilized by an intra-molecular O-H⋯N hydrogen bond, closing a six-membered ring. The dihedral angle between the naphthalene ring system and the benzene ring is 76.72 (8)°. In addition to the intra-molecular hydrogen bond, the O-H g...

In the title compound, C(21)H(20)ClNO(2), the dihedral angle between the naphthyl-ene ring system and the phenyl ring is 77.86 (15)°. The morpholine ring adopts a chair conformation. The hydroxyl group is involved in intra-molecular O-H⋯N hydrogen bonding. A weak inter-molecular C-H⋯π inter-action is present in the crystal structure.

In the title mol-ecule, C(17)H(12)INO, the dihedral angle between the naphthaldeyde plane and the 3-iodo-aniline plane is20.07 (13)°. It exists in the solid state as an enol-imine tautomer with a strong intra-molecular O-H⋯N hydrogen bond.

The title compound, C(17)H(12)BrNO, exists in an enol-imine form and the mol-ecular structure features an intra-molecular O-H⋯N hydrogen bond. The dihedral angle between the benzene ring and the naphthalene ring system is 17.27 (15)°.

The title azo mol-ecule, C16H9Br3N2O, adopts a trans conformation with respect to the azo N=N double bond. An intra-molecular O-H⋯N hydrogen bond forms an S(6) ring motif. The dihedral angle between the naphthalene ring system and the benzene ring is 33.80 (16)°. In the crystal, mol-ecules are stacked in columns along the a axis by π-π inter-actions [centroid-centroid distances = 3.815 (3) and ...

Phenyliodine(III) diacetate-induced oxidation of 2-(2-hydroxynaphthyl)benzoxazoles in alcohols, regioselectively afforded dearomatized products: 1-(benzoxazol-2-yl)-1-alkoxynaphthalen-2(1H)-ones and 1-(benzoxazol-2-yl)naphthalene-2,3-diones. Further, these products were also synthesized one-pot either from (E)-1-(((2-hydroxyphenyl) imino)methyl)naphthalen-2-ol or 2-aminophenol 2-hydroxynaphthal...