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| Preparation of acetaminophen at room temperature |
| Zhang Xiaoyang1, Xin Jiheng2, Liu Xiaolian1, Lyu Xuesong1, Liu Peizhen1, Liu Yi1 |
1. Hebei Jiheng ( Group ) Pharmaceutical Corporation Ltd., Hengshui 053000, China;
2. Hengshui No.2 High School, Hengshui 053000, China |
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Abstract Paracetamol, acetaminophen an antipyretic analgesic drug of acetanilide class, is made directly from p-aminophenol by the acylation reaction. The traditional synthetic technology of paracetamol should be improved in today's severe environmental protection situation because reaction temperature is high, the products are susceptible to be oxidized, and the industrial waste water is huge. Through the improvement of the technology, paracetamol is synthesized at room temperature, the reaction conditions are mild, the reaction solvent is recycle to reduce the industrial waste water, reduce production cost, and the reaction yield is 93 %, the purity of the product is 99 %. The reaction endpoint was deteced by the thin layer chromatography ( TLC ), and the product structures were characterized by various analytical instruments. The synthesis method has the advantages of easy obtainment of the?raw material, simple operation, the recycle solvent, and?easy separation and purification for the product.
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