Method for synthesizing herbicide fenoxaprop-p-ethyl
A technology for oxaflufen-ethyl and dichlorobenzoxazole is applied in the field of synthesizing the herbicide oxaflufen-ethyl, which can solve problems such as insufficient synthesis methods, difficult wastewater treatment, and achieve simple treatment and production cost savings. Effect
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Embodiment 1
[0022] Add 48.4g of acetone and 19.4g of 2,6-dichlorobenzoxazole into a 250ml three-necked flask, stir at a temperature of 20-25°C, and dissolve.
[0023] Add 29.5g of water, 21g of R-(+)-2-(4-hydroxyphenoxy) ethyl propionate, 31.8g of sodium carbonate, 0.5g of benzyltriethylammonium chloride into a 250ml three-necked flask, stir, and heat up to 60°C and keep warm for 3 hours to obtain a mixed solution. Raise the temperature to 70°C, add the 2,6-dichlorobenzoxazole acetone solution dropwise to the mixture in the three-necked flask, the dropwise addition is completed in about 1 hour, after the dropwise addition is completed, keep the reaction at 70-75°C for 2 hours, add dropwise and keep warm During the reaction process, the acetone in the system was distilled off, and the acetone aqueous solution was collected.
[0024] After the reaction, keep the temperature of the system at 70-75°C, let stand for 30 minutes to separate the layers, separate the organic phase, add 30g of wat...
Embodiment 2
[0026] Add 48.4g of acetone and 19.4g of 2,6-dichlorobenzoxazole into a 250ml three-necked flask, stir at a temperature of 20-25°C, and dissolve.
[0027] Add 29.5g water, 21g R-(+)-2-(4-hydroxyphenoxy) ethyl propionate, 26.5g sodium carbonate, 0.5g benzyltriethylammonium chloride into a 250ml three-necked flask, stir, and heat up to 60°C and keep warm for 3 hours to obtain a mixed solution. Raise the temperature to 70°C, add the 2,6-dichlorobenzoxazole acetone solution dropwise to the mixture in the three-necked flask, the dropwise addition is completed in about 1 hour, after the dropwise addition is completed, keep the reaction at 70-75°C for 2 hours, add dropwise and keep warm During the reaction process, the acetone in the system was distilled off, and the acetone aqueous solution was collected.
[0028] After the reaction, keep the temperature of the system at 70-75°C, let it stand for 30 minutes to separate the layers, separate the organic phase, add 30g of water to the...
Embodiment 3
[0030] Add 48.4g of acetone and 19.0g of 2,6-dichlorobenzoxazole into a 250ml three-necked flask, stir at a temperature of 20-25°C, and dissolve.
[0031] Add 29.5g of water, 21g of R-(+)-2-(4-hydroxyphenoxy) ethyl propionate, 31.8g of sodium carbonate, 0.5g of benzyltriethylammonium chloride into a 250ml three-necked flask, stir, and heat up to 60°C and keep warm for 3 hours to obtain a mixed solution. Raise the temperature to 70°C, add the 2,6-dichlorobenzoxazole acetone solution dropwise to the mixture in the three-necked flask, the dropwise addition is completed in about 1 hour, after the dropwise addition is completed, keep the reaction at 70-75°C for 2 hours, add dropwise and keep warm During the reaction process, the acetone in the system was distilled off, and the acetone aqueous solution was collected.
[0032] After the reaction, keep the temperature of the system at 70-75°C, let stand for 30min to separate the layers, separate the organic phase, add 30g of water to...
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