(Z)-3-Hy­droxy-4-(4-meth­oxy­phen­yl)but-3-en-2-one

The title compound, C₁₁H₁₂O₃, is potentially a butane-2,3-dione derivative but exists in the enol form in the solid state. In the mol­ecule, the 3-hy­droxy­but-3-en-2-one, benzene and methoxyl fragments are almost co-planar. The 3-hy­droxy­but-3-en-2-one fragment is almost planar with an r.m.s. deviation of 0.040 Å. The dihedral angle between this plane and that of the benzene ring is 5.88 (4)°. The 4-meth­oxy group also lies close to the benzene ring plane, with deviations of 0.0206 (11) Å for the O and 0.087 (2) Å for methyl C atoms. Hence, the whole mol­ecule is almost planar with an r.m.s. deviation of 0.0617 Å from a plane through all 14 non-H atoms. In the crystal, the molecules are linked by O—H...O hydrogen bonds, generating [010] chains.

1β,15α-Dihy­droxy-16α,17-ep­oxy­pregn-4-ene-3,20-dione

The title mol­ecule, C₂₁H₂₈O₅, is composed of three six-membered rings (A/B/C) and a five-membered ring (D). Ring A adopts a 1α-sofa conformation, while rings B and C adopt chair conformations. Cyclo­pentane ring D adopts a 14α-envelope conformation. In the crystal, O—H...O hydrogen bonds lead to the formation of ribbons running along the a axis. The structure is further consolidated by C—H...O inter­actions, which link the molecules head-to-tail into ribbons along the a axis.