Magnesium ethoxide, also known as ethanol magnesium in Chinese, is an organic magnesium salt. It is a powdery substance that appears white to light gray. The molecular formula is C4H10MgO2, with a molecular weight of 114.43. Its CAS number is 2414-98-4. Stable at room temperature and pressure, but may undergo violent reactions when in contact with water, moisture, strong acids, or oxidants. Avoid contact with oxides and water. Difficult to dissolve in ethers and hydrocarbons, slightly soluble in water, and soluble in ethanol. Used as a catalyst carrier for olefin polymerization of polypropylene, high-density polyethylene, and low-density polyethylene. Raw materials for precision ceramics. The application in the field of environmental protection is mainly aimed at treating heavy metal ions in industrial wastewater. Due to its unique structure, it can effectively combine with heavy metal ions to separate them from wastewater, thereby achieving the goal of purifying water quality.
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Method 1:
Reaction equation:
Mg + C2H5Br → Mg(C2H5)Br
Mg(C2H5)Br + 2C2H5OH → Mg(C2H5O)2 + C2H5Br
Among them, Mg represents metallic magnesium, C2H5Br represents alkyl halides (such as ethyl magnesium bromide), C2H5OH represents ethanol, Mg (C2H5) Br represents alkyl magnesium compounds, and Mg (C2H5O) 2 represents magnesium ethoxide. The reaction is divided into two steps. Firstly, magnesium metal reacts with alkyl halides to generate corresponding alkyl magnesium compounds, and then reacts with ethanol to generate magnesium ethoxides. This is a commonly used organic synthesis method, suitable for preparing different types of organic magnesium compounds and other organic metal compounds.
The steps for preparing Magnetium ethoxides through alkylation reaction are as follows:
Experimental steps:
1. Prepare laboratory equipment: Dry metal magnesium sheets in a dryer, and prepare glass instruments (such as round bottomed flasks or beakers) and reaction containers.
2. Prepare alkyl halides: Add alkyl halides to anhydrous ethanol to completely dissolve them. Ensure that alkyl halides are free of moisture to avoid affecting the reaction.
3. Maintain an anhydrous environment during the operation: In the experiment, it is necessary to strictly control the anhydrous environment of the reaction system to ensure that the reaction proceeds normally. Inert gases (such as nitrogen) can be used to protect the reaction vessel and operating environment, preventing moisture from the air from entering the reaction system.
4. Assembly of reaction device: Put dry metal magnesium sheets into a glass instrument, such as a round bottomed flask or beaker.
5. Adding alkyl halides: Slowly pour anhydrous ethanol containing alkyl halides into a glass instrument containing magnesium metal sheets until they are completely covered.
6. Reaction progress: Heat the mixture of magnesium metal and alkyl halides in the reaction vessel under inert gas protection. Heating plates or flames can be used for heating. The reaction temperature is usually controlled between 30-50 degrees Celsius to promote the progress of the reaction.
7. After the reaction is complete, cool the reaction vessel and obtain a solution of Magnesium ethoxide. According to experimental needs, pure Magnesium ethoxide products can be extracted by filtration or solvent evaporation.
Method 2:
The solvent method for synthesizing Magnesium ethoxides is a commonly used chemical synthesis method.
Reaction equation:
Mg + 2C2H5OH → Mg(C2H5)2O + H2
Mg + C4H8O2 → Mg(C4H7O2)2
Among them, Mg represents metallic magnesium, C2H5OH represents ethanol, C4H8O2 represents ethyl acetate, Mg (C2H5) 2O represents Magnesium ethoxide, and Mg (C4H7O2) 2 represents another form of Magnesium ethoxide. The key step of the reaction is the reaction of magnesium metal with ethanol and ethyl acetate to generate Magnesium ethoxide. This method can be used to prepare pure Magnesium ethoxides as an important reagent in organic synthesis.
Experimental steps:
1. Prepare laboratory equipment: Dry metal magnesium sheets in a dryer, and prepare glass instruments (such as round bottomed flasks or beakers) and reaction containers.
2. Prepare solution A: Pour anhydrous ethanol into a dry container. Ensure that ethanol is free of moisture and can be treated with desiccants (such as molecular sieves) to remove moisture.
3. Prepare solution B: Add ethyl acetate to another dry container. Similarly, ensure that ethyl acetate is free of moisture.
4. Maintain an anhydrous environment during the operation: In the experiment, it is necessary to strictly control the anhydrous environment of the reaction system to ensure that the reaction proceeds normally. Inert gases (such as nitrogen) can be used to protect the reaction vessel and operating environment, preventing moisture from the air from entering the reaction system.
5. Assembly of reaction device: Place the metal magnesium sheet into a glass instrument, such as a round bottomed flask or beaker.
6. Add solution A: Slowly pour solution A into a glass instrument containing magnesium metal sheets until fully covered.
7. Add solution B: Slowly pour solution B into a glass instrument containing magnesium metal sheets and solution A, while stirring the mixture with a glass rod. Stirring the mixture can promote the progress of the reaction.
8. Reaction process: Under inert gas protection, the metal magnesium in the reaction vessel reacts with ethanol and ethyl acetate. Heating plates or flames can be used for heating. The reaction temperature is usually controlled between 30-50 degrees Celsius to promote the progress of the reaction.
After the reaction is completed, cool the reaction vessel and obtain a solution of Magnesium ethoxide. According to experimental needs, pure Magnesium ethoxide products can be extracted by filtration or solvent evaporation.
Reaction 3:
Reaction equation:
MgCl2 · 6H2O + 4C2H5OH → Mg (C2H5) 2O + 2HCl + 6H2O
Among them, MgCl2 · 6H2O represents hydrated magnesium salt (magnesium chloride hexahydrate), C2H5OH represents ethanol, Mg (C2H5) 2O represents magnesium ethoxide, and HCl represents hydrochloric acid. The key step of the reaction is the reaction between hydrated magnesium salt and ethanol to generate Magnesium ethoxide. This reaction is usually carried out under hydrothermal conditions to improve the reaction rate and product purity.
Experimental steps:
1. Prepare laboratory equipment: Prepare reaction vessels (such as round bottomed flasks) and heating devices.
2. Pre treatment of reaction vessels and reagents: Clean the reaction vessels thoroughly and blow them with dry nitrogen to ensure a dust-free and anhydrous environment. Ethanol can be treated with desiccants (such as molecular sieves) to remove moisture.
3. Assembly of reaction device: Add hydrated magnesium salt to the reaction vessel.
4. Adding ethanol: Slowly add ethanol to the reaction vessel until the hydrated magnesium salt is completely covered.
5. Reaction progress: Under heating conditions, seal the reaction vessel and place it in a constant temperature bath or high-pressure vessel. The selection of reaction temperature and time is crucial for the formation of reaction products.
6. Cooling the reaction vessel: After the reaction is completed, remove the reaction vessel from the constant temperature bath or high-pressure vessel and let it cool to room temperature.
7. Separation of products: Separate the products using appropriate methods (such as filtration or centrifugation).
8. Drying product: The separated Magnesium ethoxides can be dried by vacuum drying or at low temperatures.