Methyl 2-chloro-2-cyclopropylidenacetate (CAS NO.: ), with other names as , chlorocyclopropylidene-, , could be produced through the following synthetic routes.

A. Trimethyl 2-chloro-2-cyclopropylidenorthoacetate (CAS NO.:). A 1-L, two-necked, round-bottomed flask equipped with a mechanical stirrer and a reflux condenser is charged with 40.0 g (0.19 mol) of 1-chloro-1-(trichloroethenyl)cyclopropane, 120 g of potassium hydroxide, and 300 mL of methanol. The mixture is stirred for 16–18 hr in an oil bath at 85°C. After the solution is cooled to room temperature, it is diluted with 1 L of ice water. The mixture is then transferred to a 3-L separatory funnel and extracted with three 200-mL portions of ether. The combined ether phases are washed with three 150-mL portions of saturated brine, dried over anhydrous magnesium sulfate, and filtered. The solvent is removed from the filtrate by distillation at atmospheric pressure, and the residue is distilled through a short-path column under water-aspirator vacuum to give 14.5–15.4 g (39–41%) of trimethyl 2-chloro-2-cyclopylidenorthoacetate bp 103–105°C (20 mm).

B. Methyl 2-chloro-2-cyclopropylidenacetate (CAS NO.: ). A 250-mL, one-necked, round-bottomed flask is charged with 60 mL of methylene chloride, 3.5 g of a strongly acidic ion-exchange resin, and 11.0 g (0.057 mol) of trimethyl 2-chloro-2-cyclopropylidenorthoacetate. The mixture is stirred for 12 hr at room temperature. The ion-exchange resin is removed by filtration and washed with three 10-mL portions of methylene chloride. The combined organic solutions are dried over anhydrous magnesium sulfate, filtered, and distilled at atmospheric pressure to remove the solvent. The residue is distilled through a short-path column under reduced pressure to give 6.2–6.7 g (74–80%) of methyl 2-chloro-2-cyclopropylidenacetate, bp 95–97°C (10 mm).