Synthesis, crystal structure, Hirshfeld surface analysis and energy framework calculations of trans-3,7,9,9-tetra-methyl-10-(prop-2-yn-1-yl)-1,2,3,4,4a,9,9a,10-octa-hydro-acridine.

The title heterocyclic compound, C20H27N, has been prepared in good yield (72%) via a BiCl3-catalyzed cationic Povarov reaction between N-propargyl-4-methyl-aniline and (±)-citronellal. The X-ray single-crystal study indicates that the structure consists of mol-ecules connected by C-H⋯π contacts to produce chains, which pack in a sandwich-herringbone fashion along the b-axis direction. Hirshfeld surface analysis indicates that H⋯H inter-actions dominate by contributing 79.1% to the total surface. Energy frameworks and DFT calculations indicate a major contribution of dispersive forces to the total inter-action energy.