A key intermediate of 2-(2, 2-dichloroethenyl)-3, 3-dimethylcyclopropanecarboxylic acid, 3- alkoxycarbonyl (or acyl)-4-(2, 2-dichloroethenyl)-5, 5-dimethyltetrahydro-2-furanone was prepared by the base-catalyzed condensation of 2-methyl-3, 5, 5-trichloro-4-penten-2-ol with acetate derivatives such as malonic esters, acetoacetic esters, and benzoylacetate. The reactivity of 3-acetyl-4-(2, 2-dichloroethenyl)-5, 5-dimethyltetrahydro-2-furanone to an ...
