3-chloro-2,2,3-trifluoro-1,4-benzodioxine

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Subsequently, 140 ml/h of hydrogen fluoride (measured as liquid) and 110 g/h of 2-chloro-2,3,3-trifluorobenzodioxane were passed over the catalyst at 300° C. In the course of 6 hours, 600 g of 2,2,3,3-tetrafluorobenzodioxane were obtained. This corresponds to a yield of 98%. were passed over the catalyst at 300° C

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Finally, 170 ml/h of hydrogen fluoride (measured as liquid) and 148 g/h of 2-chloro-2,3,3-trifluorobenzodioxane were passed over the catalyst at 300° C. In the course of 7 hours, 930 g of 2,2,3,3-tetrafluorobenzodioxane were obtained. This corresponds to a degree of fluorination of 97%. were passed over the catalyst at 300° C

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 500 ml of hydrogen fluoride, 5 ml of antimony pentachloride and 150 g of 2-chloro-2,3,3-trifluorobenzodioxane were heated in a closed vessel for 6 hours at 40° C., excess hydrogen fluoride was then drawn off, and the residue was taken up in methylene chloride, rendered alkaline and stem-distilled. The re-distillation gave 27 g of 2,2,3,3-tetrafluorobenzodioxane having a boiling point from 142° to 146° C. at 1020 mbar. stem-distilled The re-distillation

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 500 ml of hydrogen fluoride, 5 ml of antimony pentachloride and 150 g of 2-chloro-2,3,3-trifluorobenzodioxane were heated in a closed vessel for 6 hours at 40° C., excess hydrogen fluoride was then drawn off, and the residue was taken up in methylene chloride, rendered alkaline and stem-distilled. The re-distillation gave 27 g of 2,2,3,3-tetrafluorobenzodioxane having a boiling point from 142° to 146° C. at 1020 mbar. stem-distilled The re-distillation

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 500 ml of hydrogen fluoride, 5 ml of antimony pentachloride and 150 g of 2-chloro-2,3,3-trifluorobenzodioxane were heated in a closed vessel for 6 hours at 40° C., excess hydrogen fluoride was then drawn off, and the residue was taken up in methylene chloride, rendered alkaline and stem-distilled. The re-distillation gave 27 g of 2,2,3,3-tetrafluorobenzodioxane having a boiling point from 142° to 146° C. at 1020 mbar. stem-distilled The re-distillation