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In the title hexa­hydro­pyrimidine derivative, C28H42N2O4·0.19H2O, the 1,3-diazinane ring has a chair conformation with a diequatorial substitution. The asymmetric unit contains one half-organic mol­ecule and a solvent water mol­ecule with occupany 0.095. The mol­ecule lies on a mirror plane perpendicular to [010] which passes through the C atoms at the 2- and 5-positions of the heterocyclic system. The partially occupied water mol­ecule is also located on this mirror plane. The dihedral angle between the planes of the aromatic rings is 17.71 (3)°. Two intra­molecular O—H...N hydrogen bonds with graph-set motif S(6) are present. No remarkable inter­molecular contacts exist in the crystal structure.

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In the mol­ecule of the title compound, C20H26N2O2, the 1,3-diazinane ring adopts a slightly distorted chair conformation and the hy­droxy­benzyl substituents occupy equatorial positions on the N atoms of the heterocyclic ring. There are two intra­molecular O—H...N hydrogen bonds between the N atoms of the 1,3-diazinane ring and the hy­droxy groups of the aromatic rings, with an S(6) set-graph motif. However, the two observed intra­molecular hydrogen-bond distances were different. Considering that both N atoms experience the same chemical environment, it is surprising to see the difference in O...N distances [2.6771 (14) and 2.8123 (12) Å]. The crystal structure is further stabilized by a C—H...π interaction.
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