9-(2-Chloro­benzyl­idene)anthracen-10(9H)-one

In the title compound, C₂₁H₁₃ClO, the central anthracene system is distorted towards a boat conformation and the outer rings are not coplanar with the central ring [dihedral angles = 7.79 (1) and 11.90 (1)°]. The crystal structure features inversion dimers with graph-set motif R₂²(18) formed by C—H...O inter­actions.

(3E,5E)-1-Allyl-3,5-bis(4-meth­oxy­benzyl­idene)­piperidin-4-one

The piperidine ring in the title compound, C₂₄H₂₅NO₃, adopts an envelope conformation with the N atom being the flap atom, and each C=C double bond exhibits an E conformation. In the crystal, C—H...O hydrogen bonds link the mol­ecules, forming supramolecular layers that stack along the a axis.

1′′-Allyl-5′′-(4-meth­oxy­benzyl­idene)-7′-(4-methoxy­phen­yl)-1′,3′,5′,6′,7′,7a′-hexa­hydro­dispiro­[ace­naphthyl­ene-1,5′-pyrrolo­[1,2-c][1,3]thia­zole-6′,3′′-piperidine]-2,4′′(1H)-dione

In the title compound, C₃₉H₃₆N₂O₄S, the piperidine ring adopts a twisted half-chair conformation. In the pyrrolo­thia­zole fused-ring system, the pyrrole ring adopts an envelope conformation (with the C atom bound to the thia­zole ring being the flap atom) and the thia­zole ring also exhibits an envelope conformation (with the N atom bound to the pyrrole ring as the flap). The mol­ecular structure features a weak intra­molecular C—H...O inter­action. In the crystal, a C—H...O inter­action forms a linear chain along the diagonal of the ac plane, generating a C(14) graph-set motif. A weak C—H...π inter­action also occurs.