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Butylmagnesium chloride is an organometallic compound that is a basic compound of butylmagnesium and chloride. It is a colorless to yellow liquid compound. It has a pungent odor and accumulates in long chain-like structures forming bud-like substances which burn with the release of strong hydrogen chloride gas. It can be dissolved in organic solvents such as anhydrous ether, cyclohexane, tetrahydrofuran and benzene. It decomposes in water, causing a fire due to the reaction that produces hydrogen gas and soil material. It is a very reactive metal-organic compound, which is easily decomposed by moisture and has poor stability. An organic compound, also known as product, is an important reagent in organic synthesis. It is a strong reducing agent, which can be used to reduce compounds such as ketones and aldehydes, and can produce alkyl magnesium salts, thus playing an important role in organic synthesis.
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Chemical Formula |
C4H9ClMg |
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Exact Mass |
116 |
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Molecular Weight |
117 |
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m/z |
116 (100.0%), 118 (32.0%), 118 (13.9%), 117 (12.7%), 120 (4.5%), 117 (4.3%), 119 (4.0%), 119 (1.4%) |
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Elemental Analysis |
C, 41.11; H, 7.76; Cl, 30.33; Mg, 20.80 |
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Physical Properties
◆ Appearance: Colorless to light-yellow liquid, often appearing blackish due to trace impurities or solvent interactions.
◆ Density: 0.962 g/mL at 25°C (in THF solution).
◆ Boiling Point: 66°C (under reduced pressure; decomposes at higher temperatures).
◆ Solubility: Soluble in ethers (THF, diethyl ether) and aromatic hydrocarbons (toluene); reacts violently with water, alcohols, and protic solvents.
◆ Stability: Highly sensitive to air and moisture, requiring storage under inert gas (argon or nitrogen) at 2–8°C. Exposure to oxygen leads to oxidation, forming magnesium peroxides and alkyl hydroperoxides, while water triggers hydrolysis, releasing flammable butane gas and corrosive magnesium hydroxide.
Butylmagnesium chloride, as an important chemical reagent, has a wide range of applications in the pharmaceutical field.
Synthesis of other drugs
In addition to butylphthalein, it is also involved in the synthesis of various other drugs, such as the synthesis of certain antibiotics and antiviral drugs. As an important reagent in these synthesis processes, it helps to improve reaction yield and product purity.
Antibiotic synthesis: can be used as an intermediate for the synthesis of certain β - lactam antibiotics. Through its reaction characteristics, specific functional groups can be introduced to synthesize compounds with antibacterial activity.
Antiviral drug synthesis: It can also be used to synthesize precursors for certain nucleoside antiviral drugs. These precursors can be converted into drug molecules with antiviral activity through further chemical reactions.
Magnesium supplements
Magnesium chloride is one of the important sources of magnesium and can be used to treat magnesium deficiency. Magnesium is an essential trace element for the human body, involved in various biochemical reactions, and plays an important role in maintaining normal nerve and muscle function, heart rhythm, and bone health.
Clinical application: Magnesium deficiency can lead to symptoms such as increased neuromuscular excitability and arrhythmia. Supplementing with magnesium chloride can correct magnesium deficiency and improve patients' clinical symptoms.
Drug manufacturing
Magnesium chloride is also involved in the manufacturing process of some antidepressants and antiviral drugs. Although its specific mechanism of action may vary depending on the type of drug, its importance in drug synthesis and formulation cannot be ignored.
Antidepressants: Some antidepressants require the introduction of magnesium ions during the synthesis process to enhance the stability and efficacy of the drug. Butyl magnesium chloride, as one of the sources of magnesium ions, can be used for the synthesis of these drugs.
Antiviral drugs: In the synthesis of certain antiviral drugs, they can be used as catalysts or reaction reagents to promote the formation of drug molecules.
Disinfection and antibacterial
Magnesium chloride also has disinfectant and antibacterial effects during surgical procedures and drug production. This helps to reduce the risk of infection at the surgical site, improve the success rate of surgery, and also ensure hygiene standards during drug production.
Surgical disinfection: Magnesium chloride solution can be used for disinfection of surgical sites, killing potential pathogenic microorganisms and reducing the risk of postoperative infection.
Drug production: During the drug production process, magnesium chloride can be used for disinfection and sterilization of the production environment to ensure the sterility and safety of drug products.
Medical material production
Magnesium chloride can also be used to produce some medical materials, such as fireproof materials, adhesives, etc. The application of these materials in the medical field, such as operating room decoration and medical equipment manufacturing, helps to improve the safety and comfort of the medical environment.
Fireproof material: Magnesium chloride can be used to produce medical fireproof materials such as fireproof coatings and fireproof boards. These materials have good flame retardant properties, which can effectively prevent the occurrence and spread of fires, and protect the safety of medical staff and patients.Adhesive: Magnesium chloride can also be used to produce medical adhesives for bonding and fixing medical equipment. These adhesives have good adhesive properties and biocompatibility, which can meet the special needs of medical equipment.
Adjuvant therapy
Butylmagnesium chloride can also be used as an adjuvant in some adjuvant treatments. For example, during hemodialysis, magnesium chloride can serve as an electrolyte balance regulator to help maintain electrolyte balance in the patient's body.
Hemodialysis: During the process of hemodialysis, the difference in composition between the dialysate and human plasma may lead to electrolyte imbalance in the patient's body. By supplementing electrolyte modulators such as magnesium chloride, electrolyte imbalance can be corrected and clinical symptoms of patients can be improved.
Scientific research experiment
It is also used in scientific research experiments, as a biochemical reagent, and has applications in cell culture, in vitro diagnostics, and other fields.
Cell culture: can be used for preparing cell culture media to provide necessary nutrients and growth factors for cells.
In vitro diagnosis: n-butyl magnesium chloride can also be used for the preparation of in vitro diagnostic reagents, such as enzyme-linked immunosorbent assay (ELISA). These reagents can be used to detect specific biomarkers in patients' bodies, providing important basis for the diagnosis and treatment of diseases.
Butylmagnesium chlorid is synthesized by reacting 1-bromobutane with magnesium powder to generate Butylmagnesium bromide, and then halogenating it with reagents such as aluminum chloride or mercuric chloride to obtain it. This is a two-step reaction, described in detail below.
1. Generate Butylmagnesium bromide:
Butylmagnesium bromide is the precursor of product, so Butylmagnesium bromide needs to be prepared first.
The reaction formula is as follows:
C4H9Br + Mg → C4H9MgBr
This is a typical Grignard reaction, and the specific experimental conditions are as follows:
First, 4 millimoles (mmol) of 1-bromobutane and 4 millimoles (mmol) of magnesium powder need to be prepared.
Then add all reagents to a dry vessel, preferably a dry four-neck flask. Before adding reagents, use an inert gas (such as nitrogen) to vent the air out of the vessel, which helps to maintain a dry, anhydrous, and oxygen-free environment during the reaction.
Inject diethyl ether (60~80mL) and add a magnet, then use a stirrer to fully stir the reaction solution evenly.
The reactor was placed in a constant temperature tank with oxygen exhausted, and then magnesium powder and 1-bromobutane were sequentially added to it. When adding linear alkyl halides, be sure to add slowly while stirring well to ensure that the reaction proceeds well.
After adding the reactants, it is necessary to close the reactor with a nitrogen ball valve, seal it and add it to deep cold water, keep the reaction temperature at about 0°C, and continue the reaction overnight (about 16-20 hours).
Since this reaction generates heat, the water temperature needs to be kept at around 0°C at all times to prevent the reaction liquid from heating up and losing the activity of important reactions.
After the reaction, Butylmagnesium bromide can be separated by filtration or distillation, and its appearance is a transparent, colorless liquid, which can be filtered and dried under vacuum.
2. Halogenation to get Butylmagnesium chloride:
After Butylmagnesium bromide is produced, it can be converted to it by halogenation.
The reaction formula is as follows:
C4H9MgBr + AlCl3 → C4H9MgCl + AlBr3
The specific experimental conditions are as follows:
Knowledge of the reaction to produce Butylmagnesium bromide is required, which is carried out in an anhydrous, oxygen-free environment. Therefore, before carrying out the halogenation reaction, it is necessary to use a dry four-neck flask, dry tools and high-purity reagents for the reaction.
First prepare 3 millimoles (mmol) of Butylmagnesium bromide, and dissolve it in 80 mL of ether at room temperature.
Then prepare 10 millimoles (mmol) of reagents such as aluminum chloride or mercuric chloride, and dissolve it in 30 mL of ether, and perform a dark reaction at 4 °C.
Then aluminum and 3 mmol (mmol) of Butylmagnesium bromide are added to the reactor, and the temperature is kept between 5 and 10 °C.
During the reaction, the reactor should be stirred sufficiently to ensure that the reagents can adequately mix together and thoroughly react.
After the reaction is completed, the reaction solution can be separated into an organic phase through a separation funnel.
In this way, it is obtained, and the resulting product can be separated and purified by filtration or vacuum evaporation, and finally pure product is obtained.
Butylmagnesium chloride remains a powerhouse in synthetic chemistry, enabling breakthroughs across pharmaceuticals, agrochemicals, and advanced materials. Its versatility, combined with ongoing research into greener and more sustainable methods, ensures its continued relevance in the 21st century. As chemistry advances, BuMgCl will undoubtedly play a pivotal role in shaping the future of molecular engineering and industrial innovation.
By understanding its properties, applications, and safety measures, chemists can harness the full potential of this remarkable reagent while minimizing risks to health and the environment.
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