Preparation method of 3,5-di (trifluoromethyl) benzoyl chloride and new 3,5-di trihalomethyl benzoylate A and 3,5-dimethyl benzoylate A
A technology of benzoyl chloride and trifluoromethyl, used in the preparation of 3,5-bis(trifluoromethyl)benzoyl chloride and new 3,5-bis(trihalomethyl)- and 3, In the field of 5-dimethylbenzoyl halide, it can solve problems such as huge expenses
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Embodiment 1
[0070] 3,5-Dimethylbenzoyl chloride
[0071] First, 1000 g of 3,5-dimethylbenzoic acid in 450 ml of toluene was placed in a 4-liter flat-bottomed reaction vessel, and 80 ml of thionyl chloride was added dropwise at 60° C. for 2 hours under stirring to generate gas. The mixture was then heated to boiling (internal temperature 102°C) and refluxed for 2 hours. Excess thionyl chloride and some toluene were then distilled off at atmospheric pressure at a top temperature of up to 102° C. during 1.5 hours. The mixture was allowed to cool to 80°C and the toluene was distilled off, this time at 20 mbar. The residue was distilled off at 20 mbar up to a boiling point of 110° C. (in the still) column. The residue obtained was 1092 g (96.7% of theory) of 3,5-dimethylbenzoyl chloride.
Embodiment 2
[0073] 3,5-Bis(trichloromethyl)benzoyl chloride
[0074] At 120°C, 1092g of 3,5-dimethylbenzoyl chloride was first added to a reaction vessel equipped with an air-cooled UV immersion lamp. Under UV radiation, a total amount of 4340g of chlorine was introduced during 61 hours, and the temperature rose steadily. up to 180°C. At this point 100% of the starting material had reacted according to GC analysis. After blowing off the excess chlorine with nitrogen, 2390 g (98.1% of theory) of 3,5-bis(trichloromethyl)benzoyl chloride remained.
Embodiment 3
[0076] 3,5-bis(trifluoromethyl)benzoyl fluoride
[0077] First, 990 ml of anhydrous hydrofluoric acid were added to a 5 liter stainless steel stirred autoclave equipped with a sloped condenser (operated at -10°C with coolant) and a pressure regulator. Then, 1126 g of 3,5-bis(trichloromethyl)benzoyl chloride were added dropwise during 30 minutes at -5 to 0°C, with only slight generation of hydrogen chloride gas. Allow the temperature to rise to +20°C. When the slight gas evolution had ended (after 1.5 hours), 68 g of titanium tetrachloride were added during 40 minutes. When the new gas evolution subsides (after 2 hours), seal the equipment, inject nitrogen to 10 bar, gradually heat the equipment to 140° C., and continuously depressurize the generated hydrogen chloride at 25 bar. After 11 hours at 140°C, the reaction was complete. The autoclave was cooled and decompressed, excess hydrogen fluoride (248 g) was distilled off at atmospheric pressure, and the residue was distille...
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