Ethyl 6-(6-meth­oxy­naphthalen-2-yl)-4-(naphthalen-2-yl)-2-oxocyclo­hex-3-ene-1-carboxyl­ate

The title compound, C₃₀H₂₆O₄, contains an oxo-cyclo­hexane ring in a distorted half-chair configuration, with disorder of two C atoms in a 0.859 (4):0.141 (4) ratio. The dihedral angle between the mean planes of the two napthalene ring systems is 58.6 (8)°.

(E)-N'-(4-Fluoro­benzyl­idene)-2-(3-methyl­phen­yl)acetohydrazide

In the title compound, C₁₆H₁₅FN₂O, the dihedral angles between the benzene rings are74.7(8), 74.1 (1), 74.2 (7) and 74.3 (5)° in the four independent mol­ecules in the asymmetric unit. In the crystal, N-H-O hydrogen bonds involving the hydrazide and acetyl groups, which form R₂²(18) ring motifs, link the mol­ecules into dimers, which form columns along [010].

N-(4-Bromo­phen­yl)acetamide: a new polymorph

A new polymorph of the title compound, C₈H₈BrNO, has been determined at 173 K in the space group P2₁/c. The previous room-temperature structure was reported to crystallize in the ortho­rhom­bic space group Pna2₁ [Andreetti et al. (1968). Acta Cryst. B24, 1195–1198]. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds forming chains along [010]. Weak C—H...π inter­actions are also present.