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The title compound, C 17 H 17 ClO 3 , has been synthesized by the reaction of  p -chloro­benzaldehyde, isopropyl­idene malonate and 5,5-dimethyl­cyclo­hexane-1,3-dione with triethyl­benzyl­ammonium chloride in water as a green solvent. The six membered pyran­one ring of the hexa­hydro­coumarin system has a screw-boat conformation while the dimethyl­cyclo­hexenone system has a distorted envelope conformation. The dihedral angle between the least-squares planes of the coumarin ring system and the benzene ring is 85.64 (9)°.

4-(4-Chlorophenyl)-7,7-dimethyl-7,8-dihydro-4H-1-benzopyran-2,5(3H,6H)-dione