2,2′-[(2S*,6R*)-Piperidine-2,6-di­yl]­di­pro­pan-2-ol

In the title compound, C₁₁H₂₃NO₂, the piperidine ring has a chair conformation. The two hy­droxy H atoms are disordered over two positions with fixed occupancy ratios of 0.57:0.43 and 0.63:0.37. In the mol­ecule, there are two short N—H...O inter­actions. In the crystal, four symmetry-related mol­ecules are linked by O—H...O hydrogen bonds to form a cage-like arrangement, centered about the point of inter­section of three twofold axes. These cages stack along the [100] direction.

4-Meth­oxy­benzoyl-meso-octa­methyl­calix[2]pyrrolidino[2]pyrrole: an acyl chloride derivative of a partially reduced calix[4]pyrrole

In the title compound, C₃₆H₅₀N₄O₂, the two pyrrolidine rings have envelope conformations. The conformation of the macrocycle is stabilized by N—H...N hydrogen bonds and a C—H...N inter­action. The benzoyl ring is inclined to an adjacent pyrrole ring by 6.76 (9)°, with a centroid-to-centroid distance of 3.6285 (10) Å. In the crystal, apart from a C—H...O and a C—H...π inter­action, mol­ecules are linked via an N—H...O hydrogen bond, leading to the formation of helical chains propagating along [010].

4-Chloro­benzoyl-meso-octa­methyl­calix[2]pyrrolidino[2]pyrrole: an acyl chloride derivative of a partially reduced calix[4] pyrrole

In the title compound, C₃₅H₄₇ClN₄O, the two pyrrolidine rings have envelope conformations. The conformation of the macrocycle is stabilized by N—H...N hydrogen bonds and a C—H...N inter­action. The benzoyl ring is inclined to the adjacent pyrrole ring by 11.66 (11)°, with a centroid–centroid distance of 3.7488 (13) Å. In the crystal, molecules are linked by N—H...O hydrogen bonds into helical chains propagating in [010] and C—H...O and C—H...π interactions are also observed.