(5R)-5-[(1R)-2,2-Dichloro-1-methyl­cyclo­prop­yl]-2-methyl­cyclo­hex-2-en-1-one

The title compound, C11H14Cl2O, was synthesized by the reaction of a dichloro­methane solution of (R)-carvone and potassium tert-butano­late in the presence of a catalytic amount of benzyl­triethyl­ammonium chloride in chloro­form. The cyclo­hexene ring adopts a half-boat conformation. The cyclo­propyl ring is unsymmetrical, the shortest C—C bond being distal to the alkyl-substituted C atom. The crystal packing is stabilized only by van der Waals inter­actions