2-{[(2-Hy­droxy-3,5-dimethyl­benz­yl)(meth­yl)amino]­meth­yl}-4,6-dimethyl­phenol

In the title compound, C₁₉H₂₅NO₂, the dihedral angle between the benzene rings is 53.15 (8)°. One of the –OH groups forms an intra­molecular O—H...N link, generating an S(6) ring. The other –OH group forms an inter­molecular O—H...N hydrogen bond in the crystal, generating centrosymmetric R₂²(20) loops.

4,4′-Dimeth­oxy-2,2′-[methyl­aza­ne­diyl­bis(methyl­ene)]diphenol

The title compound, C₁₇H₂₁NO₄, shows an intra­molecular hydrogen bond between a phenol OH group and the N atom. In the crystal, mol­ecules are connected by pairs of O—H...O hydrogen bonds into inversion dimers.

4,4′-Diethyl-2,2′-[(N-cyclo­hexyl­imino)­bis­(methyl­ene)]diphenol

The title compound, C₂₄H₃₃NO₂, exhibits an intra­molecular hydrogen bond between a phenol –OH group and the N atom. In the crystal, mol­ecules are connected by pairs of O—H...O hydrogen bonds.