3,4-Pyridinedicarboxylicacid, dimethyl ester (6CI,7CI,8CI,9CI)

3,4-Dihydroxybenzophenone, its main uses are as follows:
This substance is a key raw material for organic synthesis. In the field of pharmaceutical synthesis, it can act as a variety of drug intermediates. For example, when developing compounds with specific physiological activities, it can use its unique chemical structure to build a core skeleton of drug molecules through a series of chemical reactions, laying the foundation for the synthesis of new therapeutic drugs.
In the field of materials science, it can be used as a light stabilizer. Because it has the characteristics of absorbing ultraviolet rays, it can effectively prevent polymer materials such as plastics and rubber from being degraded and aged due to ultraviolet irradiation, and prolong the service life of materials. Adding an appropriate amount of this substance to plastic products, when plastic products are exposed to sunlight for a long time outdoors, they can slow down problems such as discoloration, brittleness and decline in mechanical properties, and maintain good physical properties and appearance.
In the cosmetics industry, it also has important applications. Because of its ability to absorb ultraviolet rays, it is often added to sunscreen cosmetics. It can absorb part of the harmful band of ultraviolet rays, reduce the damage of ultraviolet rays to the skin, provide protection for the skin, prevent sunburn, tanning and photoaging, and help people better protect their skin when they are outdoors.
In addition, in the field of coatings, 3,4-dihydroxybenzophenone can enhance the weather resistance of coatings. When coatings are applied to building exteriors, automotive surfaces, and other areas that require long-term exposure to light and climate, they can resist UV corrosion, reduce fading, pulverization, and other phenomena, and maintain aesthetic and protective functions.

3,4-Dimethyl dimethyl adipate is an organic compound. Its physical properties are as follows:
Looking at it, this substance is mostly a colorless to light yellow transparent liquid at room temperature, with a clear appearance and no visible impurities. This is because its molecular structure is arranged in an orderly manner and the interaction is stable, so it appears in this state.
Smell, it has a weak and special odor, although not pungent, it can still be detected. This odor originates from the vibration and volatilization of specific functional groups in its molecules, which is an inherent property of the substance.
When it comes to the melting point, the melting point is quite low, usually below -20 ° C. Due to the weak intermolecular force, the temperature rises slightly, and the molecule can break free and change from solid to liquid. The boiling point is relatively high, roughly between 280 and 300 degrees Celsius. Due to the large molecular weight and the existence of a certain van der Waals force between molecules, higher energy is required to vaporize it.
Its density is less than that of water, about 0.98 - 1.02g/cm ³, so if mixed with water, it will float on the water surface. This is determined by its molecular composition and structure, resulting in a smaller mass per unit volume than water.
In terms of solubility, it is soluble in many organic solvents, such as ethanol, ether, acetone, etc., but insoluble in water. This is because the compound molecule is non-polar or weakly polar, while water is a polar molecule. According to the principle of "similar miscibility", it is easily soluble in non-polar or weakly polar organic solvents, but difficult to dissolve in water with strong polarity.

3,4-Dimethyl adipate is an organic compound. It has various chemical properties, which are described in detail as follows:
First, hydrolysis. This ester can be hydrolyzed in water or under the catalysis of acid and base to produce 3,4-dimethyl adipic acid and methanol. In acidic medium, this hydrolysis reaction is reversible; in alkaline medium, because the base can react with the generated acid, the reaction is completely hydrolyzed. This so-called saponification reaction.
Second, the ability of alcoholysis. 3,4-Dimethyl adipate can be alcoholyzed with other alcohols under the action of catalysts. In this process, the methoxy group of the ester group is replaced by the alkoxy groups of other alcohols to form new esters and methanol.
Third, the quality of aminolysis. It reacts with ammonia or amines to obtain amide compounds. In this reaction, the methoxy group of the ester group is replaced by an amino group or an amine group, showing a unique chemical transformation.
Fourth, the property of reduction. Under the action of specific reducing agents, such as lithium aluminum hydride, the ester group of 3,4-dimethyl adipate can be reduced to alcohol hydroxyl groups to generate corresponding alcohol compounds.
Fifth, the sign of substitution reaction. The hydrogen on the carbon atom connected to the ester group in the compound molecule can be replaced by other atoms or groups under appropriate conditions to participate in various organic synthesis reactions, providing the possibility for the construction of complex organic molecular structures.
In summary, dimethyl 3,4-dimethyladipate is rich in chemical properties and is widely used in the field of organic synthesis. It is an important raw material and intermediate for many chemical reactions, promoting the development and practical application of organic chemistry.

The preparation method of 3,4-diaminodiphenyl ether is to take dichlorodiphenyl ether and excess ammonia water and place them in an autoclave. The kettle is sealed and heated to raise the temperature in the kettle to a suitable environment, and maintain this temperature and pressure for a period of time. In this process, the dichlorodiphenyl ether reacts with ammonia water, and the amino group of ammonia replaces the position of chlorine in the dichlorodiphenyl ether to produce 3,4-diaminodiphenyl ether.
After the reaction is completed, cool the autoclave and open the kettle to take the mixture. In addition to the target product 3,4-diaminodiphenyl ether, there are still unreacted ammonia water and possible by-products. First, the excess ammonia water is removed by distillation to separate the ammonia water from the reaction product.
Then, the remaining product mixture is extracted with a suitable solvent. Select a solvent that is compatible with 3,4-diaminodiphenyl ether, but insoluble with by-products and impurities. After extraction, 3,4-diaminodiphenyl ether is dissolved in the solvent and separated from the impurities.
The extract is then distilled to remove the solvent to obtain a crude 3,4-diaminodiphenyl ether. The crude product may still contain a small amount of impurities, so it needs to be purified by recrystallization. Choose a suitable solvent, dissolve the crude product into it, heat it until it is completely dissolved, and then slowly cool it, so that 3,4-diaminodiphenyl ether crystallizes and precipitates, while impurities remain in the mother liquor. After multiple recrystallization, high-purity 3,4-diaminodiphenyl ether can be obtained.

The price range of 3,4-diaminodiphenyl ether in the market is related to various reasons. This material is often an important material for chemical and pharmaceutical industries, so its price also varies with the supply and demand of the market, manufacturing costs, and quality.
If there are many people in the market, but the supply is small, the price may increase. On the contrary, if the supply exceeds the demand, the price may decrease. As for the manufacturing cost, the price of raw materials, the simplicity of the process, and the amount of energy consumption all have an impact. If the price of raw materials is high, or the energy consumption is greatly increased due to the complexity of the process, the cost is high, and the price is also high.
Furthermore, the price varies depending on the quality. High quality, less impurities, high purity, suitable for high-end areas, and its price is higher than that of ordinary quality.
At present, the price of 3,4-diaminodiphenyl ether in the market is between hundreds and thousands of yuan per kilogram. If the quality is excellent and the needs of special industries, the price may exceed several thousand yuan. However, if it is for ordinary industrial use, the quality is average, the price may be several hundred yuan per kilogram.
The market situation is changing rapidly. If you want to know the real-time price, you can consult the chemical raw material supplier or check the quotation of the industry information platform to get the accurate number.