Application of 83121-15-7, The chemical industry reduces the impact on the environment during synthesis 83121-15-7, name is 3,5-Dichloro-2,4-difluoroaniline, I believe this compound will play a more active role in future production and life.
In a 500ml stainless steel autoclave equipped with a hydrogen port, cooling circulating water, pressure gauge and electric heating device,160 g of methanol and 22.8 g (0.1 mol) of compound (II) 3,5-dichloro-2,4-difluoronitrobenzene were added.0.80 g of 3% platinum carbon and 0.85 g (0.007 mol) of 85% phosphoric acid were added by stirring, and the pipe was rinsed with 20 g of methanol to close the kettle;Wherein the molar amount of platinum carbon is calculated as 0.80*(1-60% aqueous)*3% dry basis platinum content/195.078 platinum molecular weight=0.0000492 mol; First, hydrogen is introduced to the internal pressure of 0.2 to 0.4 MPa for 2 to 3 times, then hydrogen is introduced to the internal pressure of 1.0 to 1.5 MPa, and the temperature is controlled at 75 to 80 C to stir the reaction. During the period, hydrogen is added until the pressure is no longer lowered.HPLC monitoring raw material (II) basically disappeared or the content was less than 0.5%; reaction 6h, the reaction solution was suction filtered, the filter residue was washed twice with methanol, 10ml each time; solid platinum carbon was recovered and applied; The filtrate was vacuum-recovered to recover a large amount of light yellow solids. The mixture was stirred and dripped into 50 g of water, stirred rapidly for 30 minutes, slowly cooled to 0 to 5 C for 1 h, filtered, and dried.The solid was further washed with water to neutrality, rinsed with 10 g of water, and dried at 50 C under normal pressure to obtain a white-white powdery solid. The weight: 19.0 g, content: 97.2%; yield: 96.0%.
In the field of chemistry, the synthetic routes of compounds are constantly being developed and updated. I will also mention this compound in other articles, 3,5-Dichloro-2,4-difluoroaniline, other downstream synthetic routes, hurry up and to see.
Reference:
Patent; Jiangsu Zhongqi Technology Co., Ltd.; Chen Qinghong; Zhang Pu; Wang Fengyun; Hou Yuanchang; (7 pag.)CN109369414; (2019); A;,
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