2,2-Dimethyl-5-(2-nitro­benzyl­idene)-1,3-dioxane-4,6-dione

The asymmetric unit of the title compound, C₁₃H₁₁NO₆, contains two mol­ecules in both of which the six-membered 1,3-dioxane-4,6-dione ring shows a screw-boat conformation. The dihedral angles between the best planes through the six-membered rings are 47.8 (2) and 49.8 (2)°. In the crystal, C—H...O inter­actions link the mol­ecules, building a supramolecular sheet parallel to the c axis.

(+)-(S)-N-[(1-Benzo­thio­phen-2-yl)methyl­idene]-1-(naphthalen-1-yl)ethyl­amine

In the title compound, C₂₁H₁₇NS, the C=N double bond shows an E conformation. The dihedral angle between the mean planes of the naphthyl residue and the benzo­thio­phene residue is 89.14 (6)°. The crystal packing is stabilized by inter­molecular C—H...π inter­actions, building a ribbon structure along the a axis.

6-[(4′-Ethoxycarbonyl-[1,1′-biphenyl]-4-yl)oxy]hexanoic acid

In the title compound, C₂₁H₂₄O₅, the dihedral angle between the benzene rings is 19.57 (15)°. In the crystal, the mol­ecular arrangement makes up head-to-head centrosymmetric dimers assembled by pairs of O—H...O bonds; this arrangement builds a graph-set ring motif of R²₂(8). The dimers are linked into a tape running along the b-axis direction through C—H...O inter­actions. The packing is further consolidated by C—H...π inter­actions, forming layers parallel to (10-2).

Second monoclinic form of (E)-3-(4-fluoro­phen­yl)-1-phenyl­prop-2-en-1-one

The unit-cell dimensions and space group of the second monoclinic polymorph of the title compound, C₁₅H₁₁FO, differ from those of the previously reported form [Jing (2009). Acta Cryst. E65, o2515]. The title compound shows an E conformation of the C=C bond with the 4-fluoro­phenyl group opposite to the benzoyl group. The torsion angle of between the planes of the 4-fluoro­phenyl and benzoyl groups is 10.53 (6)°. In the crystal, weak C—H...O and C—H...F inter­actions form a cross-linked packing motif, building sheets parallel to (-102).