Method for hydrogenation reduction of 4-thiophenyl-2-nitroaniline through raney nickel
A technology of phenylthio-o-phenylenediamine and nitroaniline, which is applied in the field of Raney nickel hydrogenation reduction of 4-phenylthio-2-nitroaniline, can solve environmental pollution, unpleasant hydrogen sulfide gas, and affect products Quality and other issues
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Embodiment 1
[0020] Add 450g of methanol, 100g of 4-phenylthio-2-nitroaniline, 6.0g of Raney nickel, 2.0g of potassium hydroxide to a 2000ml autoclave, tighten the autoclave, start stirring, and use 0.5MPa of nitrogen Replacement three times, 0.5MPa hydrogen replacement three times, pressurize the hydrogen to 1.5MPa, slowly raise the temperature to 60°C, keep the pressure and temperature for 1.5 hours, take samples for HPLC analysis, if the reaction is not completed, continue to keep warm until the reaction is completed. After the reaction, the reaction kettle was cooled to room temperature, the hydrogen pressure was removed, the material was pressed out with nitrogen, the Raney nickel was removed by filtration, and the filtrate was concentrated with a rotary evaporator to obtain 86.0 g of off-white solid product with a purity of 99.95%. The rate is 98.0%.
Embodiment 2
[0022] Add 450g of methanol, 100g of 4-phenylthio-2-nitroaniline, 6.0g of Raney nickel, 3.0g of potassium hydroxide to a 2000ml autoclave, tighten the autoclave, start stirring, and 0.5MPa of nitrogen Replace three times, 0.5MPa hydrogen replacement three times, pressurize the hydrogen to 2.0MPa, slowly raise the temperature to 65°C, keep the pressure and temperature for 1.5 hours, take samples for HPLC analysis, if the reaction is not completed, continue to keep warm until the reaction is completed. After the reaction, the reactor was cooled to room temperature, the hydrogen pressure was removed, the material was pressed out with nitrogen, the Raney nickel was removed by filtration, and the filtrate was concentrated with a rotary evaporator to obtain 85.5 g of off-white solid product with a purity of 99.90%. The rate is 97.3%.
Embodiment 3
[0024] Add 900g of methanol, 200g of 4-phenylsulfanyl-2-nitroaniline, 12.0g of Raney nickel, 6.0g of potassium hydroxide to a 2000ml autoclave, tighten the autoclave, start stirring, and 0.5MPa of nitrogen Replace three times, 0.5MPa hydrogen replacement three times, pressurize the hydrogen to 1.5MPa, slowly raise the temperature to 65°C, keep the pressure and temperature for 1.5 hours, take samples for HPLC analysis, if the reaction is not completed, continue to keep warm until the reaction is completed. After the reaction was finished, the reactor was cooled to room temperature, the hydrogen pressure was removed, and the material was pressed out with nitrogen, and the Raney nickel removed by filtration was concentrated with a rotary evaporator to obtain 170.0 g of off-white solid product with a purity of 99.89%. The yield was 96.8%.
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