Dichlorofluoromethane → 1-Butyl-2-chloro-1-ethoxy-2-fluorocyclopropane

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

To a solution of 61.0 g. of 2-ethoxy-1-hexene, 135 ml. of 13.5 M potassium hydroxide and 217 g. of "18-crown -6" ether at -15° C. is added dropwise over 30 minutes at 0°, a 90 ml. portion of dichlorofluoromethane. After the addition, the mixture is placed in an ice bath. An exotherm raises the temperature to 20° C., whereupon the mixture is placed in a dry-ice/carbon tetrachloride bath to maintain the temperature at -5° C. to 0° C. After three hours at this temperature, the reaction mixture is diluted with water and extracted with ether. The ether extracts are combined, washed with water, then brine, dried over potassium carbonate and concentrated in vacuo to an oil. This oil is distilled through a 6 inch Vigreux column to provide 82 g. of the desired compound as a colorless liquid, b.p. 70°-71° C., 16 mm.

Herkunft & Nachweise