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A novel chalcone, C 20 H 20 O, derived from benzyl-idene-tetra-lone, was synthesized via Claissen-Schmidt condensation between tetra-lone and 2,4,6-tri-methyl-benzaldehyde. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds, producing R  2  2 (20) and R  2  4 (12) ring motifs. In addition, weak C-H⋯π and π-stacking inter-actions are observed. The inter-molecular inter-actions were investigated using Hirshfeld surface analysis and two-dimensional fingerprint plots, revealing that the most important contributions for the crystal packing are from H⋯H (66.0%), H⋯C/ C⋯H (22.3%), H⋯O/O⋯H (9.3%), and C⋯C (2.4%) inter-actions. Shape-index plots show π-π stacking inter-actions and the curvedness plots show flat surface patches characteristic of planar stacking.

Crystal structure and Hirshfeld surface analysis of (E)-2-(2,4,6-trimethylbenzylidene)-3,4-dihydronaphthalen-1(2H)-one