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October 28, 2025
Phenacetin powder, appears as a white crystalline powder or white, lustrous, scaly crystals. Its crystalline structure gives it a unique shine and texture. It is poorly soluble in water, with a solubility of approximately 0.076 g per 100 mL of water. However, it is slightly soluble in boiling water. Additionally, it is micro-soluble in diethyl ether but soluble in ethanol and chloroform. Phenacetin is incompatible with strong oxidizing agents and strong acids. Mixing it with these substances may lead to chemical reactions and potential safety hazards. It is classified as a carcinogen by the International Agency for Research on Cancer (IARC). Long-term or high-dose use of phenacetin may pose a risk of cancer.
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Chemical Formula |
C10H13NO2 |
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Exact Mass |
179 |
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Molecular Weight |
179 |
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m/z |
179 (100.0%), 180 (10.8%) |
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Elemental Analysis |
C, 67.02; H, 7.31; N, 7.82; O, 17.85 |
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Synthesis Methods
The phenol acetic acid method was one of the earliest synthesis methods of phenacetin powder. It starts with the preparation of phenacetin from para acetyl angelic acid (PAA). The following are the specific steps:
- Step 1: N-acetylation reaction: Acetoacetic acid can be prepared by adding ethylamine to acetic acid for N-acetylation.
PAA + CH3CO2H + C2H5NH2 → CH3CONHC2H5 + CH3CO2H + H2O
- Step 2: Esterification reaction: Next, in the presence of sulfuric acid, acetylated ethyl acetate and phenol undergo esterification reaction in carbon tetrachloride to generate Phenacetin.
CH3CONHC2H5 + C6H5OH → C6H5OCONHC2H5 + H2O
C6H5OCONHC2H5 + H2SO4 → C6H
Due to the complex preparation process of PAA, the phenylacetic acid method has gradually become the main method for synthesizing phenacetin. This method is prepared using phenylacetic acid as the raw material. The following are the specific steps:
- Step 1: Condensation reaction between phenylacetic acid and N-formylaniline: The condensation reaction between phenylacetic acid and N-formylaniline is catalyzed by sulfuric acid to produce N - (phenylacetyl) - N '- methylaniline.
C6H5CH2COOH + C6H5NH(CO)CH3 → C6H5CH2NHCOCH2C6H5 + H2O
- Step 2: Acetylation reaction of N - (phenylacetyl) - N '- methylaniline: N - (phenylacetyl) - N' - methylaniline undergoes acetylation reaction in acetic acid to produce N - (phenylacetyl) - N '- methylaniline acetate.
C6H5CH2NHCOCH3 + CH3CO2H → C6H5CH2NHCOCH2C6H5·CH3CO2H
- Step 3: N - (phenylacetyl) - N '- methylaniline acetate esterification reaction: N - (phenylacetyl) - N' - methylaniline acetate and phenol undergo esterification reaction in carbon tetrachloride to generate Phenacetin.
C6H5CH2NHCOCH2C6H5·CH3CO2H + C6H5OH → C6H5OCONHC2H5 + C6H5CH2NHCOCH2C6H5·CH3CO2H
C6H5OCONHC2H5 + CH3CO2HSO4H → C6H5OC2H5 + CH3CO2H2SO4
The discovery process of Phenacetin
In 1873, scientists first synthesized Phenacetin through a reaction between p-nitrophenol and glacial acetic acid catalyzed by tin. However, this product did not receive much attention at that time.
Years later, in 1887, Phenacetin, also known as acetophenetidin, was introduced as a medication for fever reduction and pain relief. It was the first synthetic analgesic and antipyretic drug on the market. Its mechanism of action was believed to be related to its ability to lower the body's temperature set-point in the brain and produce analgesic effects.
Unfortunately, Phenacetin was soon found to have significant side effects. Prolonged or excessive use of Phenacetin could lead to various health issues, including anemia, cyanosis, hypoxia, kidney damage, and even cancer. In particular, the use of Phenacetin was linked to a significant increase in kidney disease cases in the 1950s, leading to its eventual ban in many countries.
Despite its drawbacks, the discovery of Phenacetin was crucial in the development of modern pharmacology. Researchers soon realized that Phenacetin was metabolized in the body to form Paracetamol (acetaminophen), which had similar analgesic and antipyretic properties but with fewer side effects. This led to the development and widespread use of Paracetamol as a safer alternative to Phenacetin.
In summary, while Phenacetin's discovery marked an important milestone in the history of pharmacology, its significant side effects ultimately led to its replacement by safer alternatives like Paracetamol. The story of Phenacetin serves as a reminder of the importance of rigorous testing and continuous research in drug development.
Phenacetin, though no longer widely used due to its adverse side effects, played a significant role in the early history of pharmaceutical analgesics and antipyretics. Its applications were primarily focused on pain relief and fever reduction.
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Strict safety measures and regulations govern its production, handling, and disposal. In medical applications, phenacetin's use has been significantly restricted due to its carcinogenic properties. Historically, it was employed as an analgesic and antipyretic, but modern pharmaceuticals have replaced it with safer alternatives.
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Occupational exposure to phenacetin should be minimized, and workers handling it must wear appropriate protective gear, including gloves, goggles, and respiratory masks. Facilities where phenacetin is processed or stored must be well-ventilated to prevent the accumulation of harmful vapors or dust.
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Disposal of phenacetin waste requires specialized procedures to avoid environmental contamination. It should be managed in accordance with local and international hazardous waste regulations, often involving incineration in controlled environments or disposal in secure landfills designed for hazardous materials.
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Research into phenacetin continues to investigate potential therapeutic uses in low doses or as a precursor for synthesizing other medications, but these studies are conducted under rigorous safety protocols to ensure the health of participants and researchers.
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Moreover, educational programs and training sessions are crucial for raising awareness about the risks associated with phenacetin among healthcare professionals, researchers, and industrial workers. Continuous monitoring and updating of safety guidelines based on the latest scientific findings are essential to mitigate any potential health risks.
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In summary, phenacetin, despite its unique physical properties and historical medical applications, is now primarily recognized for its carcinogenic potential. Rigorous safety measures, including controlled handling, storage, and disposal, are imperative to protect human health and the environment from its hazards.
Phenacetin was effective in relieving a wide range of pain, from mild to moderate. It was commonly used to treat headaches, toothaches, menstrual cramps, muscle pain, and other painful conditions. The analgesic properties of Phenacetin were attributed to its ability to inhibit prostaglandin synthesis, thereby reducing inflammation and pain.
Fever Reduction
In addition to its analgesic properties, Phenacetin was also effective in reducing fever. It lowered the body's temperature set-point in the brain, allowing the body to cool itself naturally. This made it a valuable medication for treating various febrile conditions.
However, it's important to note that Phenacetin's use has been largely discontinued due to its association with adverse side effects such as kidney damage, anemia, and cancer. As a result, safer alternatives like Paracetamol (acetaminophen) have been developed and are now widely used for pain relief and fever reduction.
Research on Phenacetin powder in aqueous systems has focused on its behavior, effects, and degradation treatments in the aqueous environment.
1. Behavior of Phenacetin in the aqueous environment
As an organic pollutant, Phenacetin may be affected by a variety of factors in the aqueous environment, including solubility, stability, and transport transformation. Studies have shown that Phenacetin has a high solubility in water, which means that it can easily enter water bodies from pollution sources. In addition, Phenacetin may be degraded or transformed in water bodies by light, microbial activity and other factors.
2. Effects of Phenacetin on the aquatic environment
The presence of Phenacetin in the aquatic environment may pose a potential threat to aquatic organisms and human health. Specifically, Phenacetin may have toxic effects on aquatic organisms, affecting their growth, reproduction and survival. At the same time, Phenacetin may also be passed through the food chain and cause indirect effects on human health. In addition, the degradation products of Phenacetin may also be toxic and require attention.
3. Degradation treatment of Phenacetin in aqueous systems
To address the contamination of Phenacetin in water systems, researchers have carried out studies on a variety of degradation treatments.
Advanced oxidation technology:
Advanced oxidation technology is an effective method to degrade organic pollutants in water. By generating strongly oxidizing free radicals (e.g., hydroxyl radicals), the Phenacetin molecule can be attacked and degraded. Among them, UV/chlorine system is a commonly used advanced oxidation technology, which has the advantages of fast reaction speed, non-selectivity and high degradation efficiency.
Biodegradation method:
Biodegradation is a method that utilizes the metabolic action of microorganisms to decompose organic matter into harmless substances. For the degradation of Phenacetin , some microorganisms may have the ability to degrade it. However, the efficiency of biodegradation methods may be affected by a variety of factors, such as hydraulic retention time, temperature, and sludge return ratio. Therefore, optimization of degradation conditions is needed to improve degradation efficiency.
Adsorption method:
Adsorption is a method that utilizes the adsorption of adsorbents (e.g., activated carbon, resins, etc.) to remove organic matter from water. Although the adsorption method is usually only suitable for treating low concentrations of Phenacetin effluent, it can be used as an effective means of pretreatment under certain circumstances.
Membrane Separation Method:
Membrane separation is a method that utilizes the selective permeability of a semi-permeable membrane to separate organic matter from water. However, the membrane separation method may require high operating and maintenance costs, so its economics and feasibility need to be considered in practical applications.
In summary, the research on Phenacetin powder in water system is a complex and important topic. Through in-depth research on its behavior, effects and degradation treatment methods in the water environment, it can provide strong support for the protection of the water environment and human health.
What are the precautions for using this compound?
- Strictly follow medical advice: When using medication, it is necessary to strictly follow the doctor's advice and use the medication according to the recommended dosage and usage method. Do not increase the dosage or change the usage method on your own to avoid increasing the risk of side effects.
- Pay attention to drug interactions: This substance may interact with other drugs when used in combination, affecting drug efficacy, metabolism, and excretion processes. Therefore, when using, it is necessary to pay attention to the interaction with other drugs. Avoid using drugs that may cause adverse reactions, such as other antipyretic and analgesic drugs, anticoagulants, etc. If multiple medications need to be used simultaneously, please consult a doctor or pharmacist for advice.
- Monitoring adverse reactions: During use, the occurrence of adverse reactions should be closely monitored. Once discomfort symptoms occur, medication should be stopped immediately and medical attention sought. At the same time, regular liver and kidney function tests should be conducted to promptly detect and address potential kidney and liver damage.
- Avoid long-term or high-dose use: Due to the potential toxicity risks and side effects of this substance, long-term or high-dose use should be avoided. If long-term use of antipyretic and analgesic drugs is required, other safer and more effective alternatives should be considered.
- Pay attention to drug storage conditions: This powder should be stored in a dry, cool, well ventilated place, away from direct sunlight and high temperatures. At the same time, it should be ensured that the drug packaging is intact and free from moisture, contamination, or spoilage.
- Understanding drug information: Before use, carefully read the drug instructions to understand the ingredients, indications, dosage, contraindications, adverse reactions, and other information of the drug. If you have any questions, please consult a doctor or pharmacist for advice.
- Follow medication instructions: When using, medication instructions should be followed, such as taking medication on time, avoiding missed or excessive doses, etc. At the same time, attention should be paid to observing the efficacy and adverse reactions of drugs, and timely feedback should be given to doctors to adjust treatment plans.
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