1,3,5-Tris(pyridin-3-yl)-2,4-diaza­penta-1,4-diene

In the solid state, the structure of the title compound, C₁₈H₁₅N₅, is stabilized by weak C—H...N interactions. Mol­ecules are arranged in layers parallel to the bc plane forming an inter­esting supra­molecular structure.

2,4,5-Tris(pyridin-4-yl)-4,5-dihydro-1,3-oxazole

In the title compound, C₁₈H₁₄N₄O, the mol­ecules are disordered about a crystallographic twofold axis, leading to 50:50 disorder of the O- and N-atom sites within the oxazole ring. As a consequence, symmetry-related oxazole C-N and C-O bonds are averaged. The oxazole ring makes a dihedral angle of 6.920 (1)° with the pyridyl ring in the 2-position and 60.960 (2)° with the pyridyl rings in the 4- and 5-positions.

(2-tert-Butyl-5-hy­droxy­methyl-1,3-dioxan-5-yl)methanol

In the title compound, C₁₀H₂₀O₄, the dioxane ring adopts a chair conformation. The tert-butyl group occupies an equatorial position, and is staggered with respect to the O atoms of the dioxane ring. In the crystal, mol­ecules are connected by O—H...O hydrogen-bonds into zigzag chains of R⁴₄(8) and R²₂(12) ring motifs that run parallel to the a axis.