Synthesis and structure of (7a RS )-4-chloro-6-(4-methylphenyl)-6,7,7a,8-tetrahydro-5 H -indeno5,6- b furan-5-one, a fused-ring system arising from a new variant of the IMDAV reaction

The asymmetric unit of the title com-pound, C17H14ClNO2, contains two mol-ecules, a and b, where the hydro-benzene and pyrrole rings are in screw-boat and half-chair conformations, respectively. In the crystal, C-H⋯O and C-H⋯Cl hy-dro-gen bonds link the mol-ecules into two-dimensional networks, enclosing R 3 3(19), R 2 2(18) and R 2 2(14) ring motifs. Hirshfeld surface analysis revealed that the most important contributions to the crystal packing are from H⋯H (41.4 and 41.5% for mol-ecules a and b, respectively), H⋯C/C⋯H (18.1 and 20.2%), H⋯O/O⋯H (16.0 and 13.4%) and H⋯Cl/Cl⋯H (13.4 and 11.9%) inter-actions.