2,3,4,5-tetrachlorobenzoyl chloride

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The quantity of potassium fluoride to be used depends on the number of chlorine atoms which are to be exchanged. At least one mole of KF is used, but in general 1.1-1.5 mole, for 1 chlorine atom. A maximum of 2 moles of KF is used for 1 chlorine; beyond this, the quantity of KF has virtually no effect on the degree of fluorination, and the process becomes uneconomic. However, it is possible to save part of the costly KF when the 2,3,4,5-tetrachlorobenzoyl chloride is previously fluorinated with hydrofluoric acid, and the 2,3,4,5-tetrachlorobenzoyl fluoride, which results in virtually quantitative yield from this reaction, is used for the Cl/F exchange reaction with KF. Because of the greater activation by the more electronegative fluorocarbonyl group, its greater thermal stability, and the reduced load of KCl in the reaction mixture, this two-stage fluorination leads to an overall improvement in the balance of the nuclear fluorination.

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The quantity of potassium fluoride to be used depends on the number of chlorine atoms which are to be exchanged. At least one mole of KF is used, but in general 1.1-1.5 mole, for 1 chlorine atom. A maximum of 2 moles of KF is used for 1 chlorine; beyond this, the quantity of KF has virtually no effect on the degree of fluorination, and the process becomes uneconomic. However, it is possible to save part of the costly KF when the 2,3,4,5-tetrachlorobenzoyl chloride is previously fluorinated with hydrofluoric acid, and the 2,3,4,5-tetrachlorobenzoyl fluoride, which results in virtually quantitative yield from this reaction, is used for the Cl/F exchange reaction with KF. Because of the greater activation by the more electronegative fluorocarbonyl group, its greater thermal stability, and the reduced load of KCl in the reaction mixture, this two-stage fluorination leads to an overall improvement in the balance of the nuclear fluorination.

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The benzoyl halides (1) used as starting materials for this synthetic route are prepared as follows: 3,5-dichloro-2,4-difluorobenzoyl fluoride (boiling point 97°/20 mbar; nD20 =1.5148) and 5-chloro-2,3,4-trifluorobenzoyl fluoride (boiling point (68°-70°/20 mbar; nD20 =1.4764) are obtained together by heating tetrachlorobenzoyl chloride with potassium fluoride in sulpholane at elevated temperatures: ##STR18## The chlorination of 2,4,5-trifluorobenzoic acid in chlorosulphonic acid leads to 3-chloro-2,4,5-trifluorobenzoic acid which is reacted as the crude product with thionyl chloride to give 3-chloro-2,4,5-trifluorobenzoyl chloride (boiling point 94°/18 mbar; nD20 =1.5164): ##STR19## are prepared 68°-70°/20 mbar nD20 =1.4764) are obtained together

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The benzoyl halides (1) used as starting materials for this synthetic route are prepared as follows: 3,5-dichloro-2,4-difluorobenzoyl fluoride (boiling point 97°/20 mbar; nD20 =1.5148) and 5-chloro-2,3,4-trifluorobenzoyl fluoride (boiling point (68°-70°/20 mbar; nD20 =1.4764) are obtained together by heating tetrachlorobenzoyl chloride with potassium fluoride in sulpholane at elevated temperatures: ##STR18## The chlorination of 2,4,5-trifluorobenzoic acid in chlorosulphonic acid leads to 3-chloro-2,4,5-trifluorobenzoic acid which is reacted as the crude product with thionyl chloride to give 3-chloro-2,4,5-trifluorobenzoyl chloride (boiling point 94°/18 mbar; nD20 =1.5164): ##STR19## are prepared 68°-70°/20 mbar nD20 =1.4764) are obtained together

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The quantity of potassium fluoride to be used depends on the number of chlorine atoms which are to be exchanged. At least one mole of KF is used, but in general 1.1-1.5 mole, for 1 chlorine atom. A maximum of 2 moles of KF is used for 1 chlorine; beyond this, the quantity of KF has virtually no effect on the degree of fluorination, and the process becomes uneconomic. However, it is possible to save part of the costly KF when the 2,3,4,5-tetrachlorobenzoyl chloride is previously fluorinated with hydrofluoric acid, and the 2,3,4,5-tetrachlorobenzoyl fluoride, which results in virtually quantitative yield from this reaction, is used for the Cl/F exchange reaction with KF. Because of the greater activation by the more electronegative fluorocarbonyl group, its greater thermal stability, and the reduced load of KCl in the reaction mixture, this two-stage fluorination leads to an overall improvement in the balance of the nuclear fluorination.

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The quantity of potassium fluoride to be used depends on the number of chlorine atoms which are to be exchanged. At least one mole of KF is used, but in general 1.1-1.5 mole, for 1 chlorine atom. A maximum of 2 moles of KF is used for 1 chlorine; beyond this, the quantity of KF has virtually no effect on the degree of fluorination, and the process becomes uneconomic. However, it is possible to save part of the costly KF when the 2,3,4,5-tetrachlorobenzoyl chloride is previously fluorinated with hydrofluoric acid, and the 2,3,4,5-tetrachlorobenzoyl fluoride, which results in virtually quantitative yield from this reaction, is used for the Cl/F exchange reaction with KF. Because of the greater activation by the more electronegative fluorocarbonyl group, its greater thermal stability, and the reduced load of KCl in the reaction mixture, this two-stage fluorination leads to an overall improvement in the balance of the nuclear fluorination.

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The benzoyl halides (1) used as starting materials for this synthetic route are prepared as follows: 3,5-dichloro-2,4-difluorobenzoyl fluoride (boiling point 97° /20 mbar; nD20 =1.5148) and 5-chloro-2,3,4-trifluorobenzoyl fluoride (boiling point 68°-70° /20 mbar; nD20 = 1.4764) are obtained together by heating tetrachlorobenzoyl chloride with potassium fluoride in sulpholane at elevated temperatures: ##STR14## The chlorination of 2,4,5-trifluorobenzoic acid in chlorosulphonic acid leads to 3-chloro-2,4,5-trifluorobenzoic acid which is reacted as the crude product with thionyl chloride to give 3-chloro-2,4,5-trifluorobenzoyl chloride (boiling point 94°/18 mbar; nD20 =1.5164): ##STR15## are prepared nD20 = 1.4764) are obtained together

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The benzoyl halides (1) used as starting materials for this synthetic route are prepared as follows: 3,5-dichloro-2,4-difluorobenzoyl fluoride (boiling point 97° /20 mbar; nD20 =1.5148) and 5-chloro-2,3,4-trifluorobenzoyl fluoride (boiling point 68°-70° /20 mbar; nD20 = 1.4764) are obtained together by heating tetrachlorobenzoyl chloride with potassium fluoride in sulpholane at elevated temperatures: ##STR14## The chlorination of 2,4,5-trifluorobenzoic acid in chlorosulphonic acid leads to 3-chloro-2,4,5-trifluorobenzoic acid which is reacted as the crude product with thionyl chloride to give 3-chloro-2,4,5-trifluorobenzoyl chloride (boiling point 94°/18 mbar; nD20 =1.5164): ##STR15## are prepared nD20 = 1.4764) are obtained together

反応条件: temp:0.00; pressure:0.00; stir: