Acta Cryst. (2010). E66, o56  [ doi:10.1107/S1600536809051320 ]

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

H. Shi

Abstract: The title compound, C₁₇H₁₇ClO₃, 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)°.

Online 4 December 2009

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