Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.002 Å R factor = 0.037 wR factor = 0.110 Data-to-parameter ratio = 17.2 For details of how these key indicators were automatically derived from the article, see

In the title compound, C6H6O2·2C5H5NO, there is one pyridin‐4‐ol and half a hydro­quinone mol­ecule in the asymmetric unit; the hydroquinone molecule lies on an inversion center. The crystal structure is stabilized by inter­molecular O—H⋯N and O—H⋯O hydrogen bonds, building a corrugated two‐dimensional network.

A new methoxy functionalized 2-(trichloromethyl)-1,3-diarylimidazolidin (6) was synthesized as the precursor for N-heterocyclic carbene complexes of Pd(II) and Rh(I) by the condensation of N,N'-bis(2,4-dimethoxyphenyl)-1,2-diaminoethane with chloral. The structures of all compounds have been elucidated by a combination of multinuclear NMR spectroscopy, elemental analysis and in one instance, by single crystal X-ray diffraction. Compound 8, C 27 H 34 N 2 O 4 ClRh, crystallizes in the triclinic space group P-1 with cell dimensions a = 9.7642(12)Å, b = 11.1914(11)Å, c = 13.0102(14)Å, α = 104.034(9)°, β = 106.658(9)°, γ = 99.658(9)° with Z = 2. The molecular structure of 8 shows the geometry around the Rh metal to be a slightly distorted square planar. The crystal structure shows the formation of centrosymmetric dimers via intermolecular C-H...Cl hydrogen bonds.

The molecule of the title compound, C17H12N2O3, is not planar. The dihedral angle between the phthalonitrile unit and methoxyacetophenone group is 81.1 (1)°.

The title compound, C15H15NO2, adopts the phenol–imine tautomeric form, with a strong intra­molecular O—H⋯N hydrogen bond.