5-Hydroxy-2-pyridinecarboxylic acid, monohydrat

5-Hydroxy-2-pentenoate ethyl monohydrate, this is an exquisite compound with extraordinary uses in many fields.
In the field of medicinal chemistry, it can be used as a key intermediate. The creation of many drugs relies on this as a starting material. Through delicate chemical reactions, molecules with complex structures and specific pharmacological activities are constructed. For example, when synthesizing certain drugs for the treatment of cardiovascular diseases, 5-hydroxy- 2-pentenoate ethyl monohydrate can participate in key reaction steps with its unique chemical structure, helping to construct active ingredients that regulate blood lipids and improve blood circulation.
In the field of organic synthesis, it is also an indispensable role. Because its molecules contain active functional groups such as hydroxyl and ester groups, they can participate in various types of reactions, such as esterification, condensation, substitution, etc. With these reactions, organic chemists can skillfully build more complex and diverse organic molecular structures, providing key building blocks for the study of new materials and total synthesis of natural products.
In the fragrance industry, 5-hydroxy- 2-pentenoic acid ethyl ester monohydrate also shows unique value. Its specific chemical composition and structure give it a unique odor characteristic, which can be used as an important component in fragrance preparation. After being carefully blended by professional perfumers, it can be integrated into various flavors to add a unique aroma to perfumes, air fresheners, food fragrances and other products, and enhance the olfactory experience of the products.
In addition, in the field of materials science, through specific chemical modifications or composites with other materials, it may endow materials with certain special properties, such as improving the solubility and flexibility of materials, and even affecting the crystallization behavior and thermal stability of materials, thus providing new opportunities and approaches for the development of new functional materials.

5-Hydroxy-2-pentenoic acid monohydrate is also an organic compound. Its physical properties are quite numerous, as follows:
Looking at its appearance, at room temperature, it often takes the form of a white to light yellow crystalline powder. This shape is easy to identify and can be observed visually. Its odor has a slightly specific smell. Although it is not strong and pungent, it also has a unique smell, which is comparable to unusual and odorless things.
As for the melting point, the melting point of this compound is about [X] ° C. When the temperature rises to this value, the solid state begins to melt into a liquid state, and the force between its molecules changes due to heat. The boiling point is around [X] ° C under specific pressure conditions. At this time, the liquid state turns to a gaseous state, and the molecular movement is more intense, breaking free from the liquid phase.
In terms of solubility, 5-hydroxy- 2-pentenoic acid monohydrate has a certain solubility in water. Water is the source of all things, and many substances can be soluble with it. This compound can form a certain dispersion system with water, or because its molecular structure contains hydrophilic groups, such as hydroxyl groups, and can form hydrogen bonds with water molecules, so it is soluble. In organic solvents, such as ethanol, acetone, etc., it also has different degrees of solubility. In ethanol, the dissolution condition is better. Because the polarity of ethanol is similar to the polarity of the partial structure of the compound, according to the principle of similar miscibility, the two are easily miscible.
The density is [X] g/cm ³, which indicates the mass per unit volume and reflects the compactness of the substance. The size of the density is related to the arrangement of molecules and the relative molecular weight. The relative molecular weight is larger, and the arrangement of molecules is relatively close, the density is correspondingly higher.
The physical properties of 5-hydroxy- 2-valenoic acid monohydrate are of great significance in many fields such as chemical industry and medicine. Its appearance, odor, and other properties can assist in identification and preliminary judgment; its melting point, solubility, etc. are related to its separation, purification, and application in different media; density is indispensable in material calculation and preparation.

5-Hydroxy-2-pentenoic acid and its sodium salt monohydrate, the chemical properties of which are of great value to explore.
5-Hydroxy-2-pentenoic acid has both hydroxyl and carbon double bonds and carboxyl groups in its molecules. The carboxyl group makes it acidic and can neutralize with bases, just like the action of acetic acid and bases, which can generate corresponding salts and water. The presence of hydroxyl groups gives it a certain hydrophilicity and can also participate in many substitution reactions, such as esterification with alcohols under appropriate conditions, similar to the process of ethanol and acetic acid forming ethyl acetate. Furthermore, the carbon-carbon double bond is an active structure, which can be added to the reaction, such as the addition of hydrogen to convert to saturated valeric acid, just like the addition of ethylene to hydrogen to generate ethane; it can also be added to halogen elements to generate halogenated valeric acid derivatives.
As for 5-hydroxy- 2-pentenoic acid sodium salt monohydrate, its solubility in water is better than 5-hydroxy- 2-pentenoic acid due to salt formation. Its chemical properties are affected to a certain extent by sodium ions, and sodium ions and 5-hydroxy- 2-pentenoic acid ions can be ionized in aqueous solution. In the chemical reaction of this salt, the active site of 5-hydroxyl-2-pentenoic acid ion is still the acid structure derived from hydroxyl group, carbon-carbon double bond and carboxyl group, and a similar reaction can occur as described above. However, due to the existence of sodium ions, some reactions in which they participate may be different from those in which 5-hydroxyl-2-pentenoic acid itself participates in the reaction rate and reaction conditions. And due to the presence of crystal water, the crystal water may be lost under heating and other conditions, which will affect its chemical properties and participation in the reaction.

To prepare 5-hydroxy-2-pentenoic acid monohydrate, you can follow the ancient method.
First take an appropriate amount of pentenal, put it in a clean kettle, slowly heat it at low temperature, mix it with an appropriate amount of potassium hydroxide solution, stir slowly, so that the two are fully integrated. This process requires careful temperature control, not to cause the temperature to rise sharply, so as not to damage the product. When the reaction is smooth, you can see the gradual change of the solution in the kettle, which is the reaction between pentenal and potassium hydroxide.
Then, filter the product obtained by the reaction with a specific filter, remove its residue, and leave the clear liquid. This clear liquid contains the desired product prototype.
Then, add an appropriate amount of dilute sulfuric acid dropwise to the clear liquid, and stir while adding until the solution is slightly acidic. This step needs to be done with caution. The amount of sulfuric acid should not be too much or too little. More products will be damaged, and less reactions will not be completed.
After the solution is slightly acidic, use distillation to improve its purity. Steam over low heat to allow the moisture to gradually disappear, and then adjust the heat to collect the fraction in a specific temperature range. This fraction is 5-hydroxyl-2-valenoic acid.
As for obtaining 5-hydroxy- 2-pentenoic acid monohydrate, the obtained 5-hydroxy- 2-pentenoic acid can be placed in a suitable environment to naturally absorb water, or an appropriate amount of water vapor can be introduced to control its environmental humidity and temperature. After time, 5-hydroxy- 2-pentenoic acid monohydrate can be obtained.
When operating, it is necessary to strictly follow the procedures and pay attention to safety. Every step is related to the quality and quantity of the product, and cannot be slack.

I look at your question, but I am inquiring about the market price of 5-hydroxytryptamine-2-p-toluenesulfonic acid monohydrate. The price of this substance in the market is difficult to generalize, due to many factors that affect its price.
One is related to purity. If the purity is high and there are few impurities, the price will be high; if the purity is slightly lower and contains some impurities, the price will drop slightly. In high purity terms, it can reach hundreds of gold per gram, but this is only a rough number, not the exact value.
Second, the price varies from producer to producer. Well-known large factories have excellent craftsmanship and strict quality control, and the quality of the products they produce is excellent, and the price may be high; while small factories produce, although the price may be low, the quality may vary.
Third, the supply and demand of the city is the key factor. If there are many applicants, the supply will be small, and the price will rise; conversely, if the supply exceeds the demand, the price will decline.
Fourth, the amount of purchase is also related to the price. If you buy in bulk, the merchant may give a discount to promote the sale, and the price per unit will be low; if you only buy a small amount, the price may not be good.
To sum up, if you want to know the exact price, you must check the market carefully and consult the merchant before you can get a more accurate number. And the market conditions are changing rapidly, and the price also shifts with it, so it cannot be argued in the same way.