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With potassium fluoride; nitrobenzene In sulfolane at 200 - 220℃; for 17 h;
Example 3; Preparation method of 3,4,5-trifluorobenzotrifluoride; 860 g of dry sulpholane and 524 g of dry KF were initially charged with exclusion of moisture in an autoclave, and 500 g of 3,4,5-trichlorobenzotrifluoride, 5 g of nitrobenzene and 25 g of CNC catalyst were added. The vessel was sealed and the mixture subsequently heated to 200° C. for 5 h and then to 220° C. for a further 12 h. During the reaction, a maximum total pressure of 9 bar arose. The mixture was then cooled to 20° C. and decompressed into a cooled receiver. The product was distilled off at standard pressure. After redistillation of the crude product, 300 g of 3,4,5-trifluorobenzotrifluoride (75percent of theory) were obtained as a colourless liquid.
With potassium fluoride; nitrobenzene;1,3-dimethyl-2-(N',N',N",N"-tetramethylguanidino)-4,5-dihydro-3H-imidazolium chloride; In sulfolane; at 200 - 220℃; under 6750.68 Torr; for 17h;
Example 3; Preparation method of 3,4,5-trifluorobenzotrifluoride; 860 g of dry sulpholane and 524 g of dry KF were initially charged with exclusion of moisture in an autoclave, and 500 g of <strong>[50594-82-6]3,4,5-trichlorobenzotrifluoride</strong>, 5 g of nitrobenzene and 25 g of CNC catalyst were added. The vessel was sealed and the mixture subsequently heated to 200 C. for 5 h and then to 220 C. for a further 12 h. During the reaction, a maximum total pressure of 9 bar arose. The mixture was then cooled to 20 C. and decompressed into a cooled receiver. The product was distilled off at standard pressure. After redistillation of the crude product, 300 g of 3,4,5-trifluorobenzotrifluoride (75% of theory) were obtained as a colourless liquid.
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