3,4-Di­fluoro-2-hy­droxy­benzoic acid

In the title compound, C₇H₄F₂O₃, an intra­molecular O—H...O hydrogen bond is observed. In the crystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R₂²(8) ring motifs. These dimers are linked by C—H...O and C—H...F hydrogen bonds, forming sheets lying parallel to (30-1). The sheets are linked by aromatic π–π stacking inter­actions [inter-centroid distance = 3.7817 (9) Å], forming a three-dimensional structure.

5′-([1,1′-Biphen­yl]-4-yl)-1′,1′′,3′′-tri­methyl­dispiro[indane-2,2′-pyrrolidine-4′,5′′-[1,3]diazin­ane]-1,3,2′′,4′′,6′′-penta­one

In the title compound, C₃₀H₂₅N₃O₅, the central five-membered heterocyclic ring adopts an envelope conformation, with the N atom as the flap. The dihedral angles between this central ring and the pendant indane ring system, the trione and benzene rings are 87.49 (5), 82.95 (10) and 72.42 (10)°, respectively. The dihedral angle between the rings of the biphenyl group is 45.99 (13)°. In the crystal, mol­ecules are linked by C—H...O hydrogen bonds into [101] C(12) chains.