3,3-二氟二氢-2H-吡喃-2,6(3H)-二酮

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 3 g of 2,2-difluoroglutaric anhydride in 25 ml of dry methanol is allowed to remain at 25° for 18 hrs. At the end of this period the methanol is removed in vacuo leaving behind 2,2-difluoroglutaric 1-methyl ester as an oil. At the end of this period the methanol is removed in vacuo

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 5 g of 2,2-difluoroglutaric acid in 20 ml of acetic anhydride is refluxed for two hrs, 5 ml of the resulting solution is distilled off at ordinary pressure and the residual solution freed from acetic anhydride under reduced pressure. The resulting oil consists of 2,2-difluoroglutaric anhydride. 5 ml of the resulting solution is distilled off at ordinary pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 5 g of 2,2-difluoroglutaric acid in 20 ml of acetic anhydride is refluxed for two hrs, 5 ml of the resulting solution is distilled off at ordinary pressure and the residual solution freed from acetic anhydride under reduced pressure. The resulting oil consists of 2,2-difluoroglutaric anhydride. 5 ml of the resulting solution is distilled off at ordinary pressure

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 3 g of 2,2-difluoroglutaric anhydride in 25 ml of dry methanol is allowed to remain at 25° for 18 hrs. At the end of this period the methanol is removed in vacuo leaving behind 2,2-difluoroglutaric 1-methyl ester as an oil. At the end of this period the methanol is removed in vacuo

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 5 g of 2,2-difluoroglutaric acid in 20 ml of acetic anhydride is refluxed for two hrs, 5 ml of the resulting solution is distilled off at ordinary pressure and the residual solution freed from acetic anhydride under reduced pressure. The resulting oil consists of 2,2-difluoroglutaric anhydride. 5 ml of the resulting solution is distilled off at ordinary pressure