3-fluropyridine-2-carboxylic acid

3-Yanghe-2-The main use of tannic acid is in many aspects. Tannic acid, also known as tannic acid, has important uses in fields such as engineering, engineering, and food.
In terms of engineering, tannic acid is often used in leather tanning. The tanning process of leather is the process of transforming raw leather into durable leather. Tannic acid can combine with proteins in the skin to form insoluble compounds, which can increase the durability, durability, and water resistance of leather, making it durable and making it into various leather goods.
In the field, tannic acid has the functions of harvesting, hemostasis, and antibacterial. Its effect can make the local protein coagulation, less secretion, so it is often used to treat skin diseases such as rash and hemorrhoids, and can solve the disease. Its hemostatic effect can be used to treat microbleeds, help blood coagulation, prevent bleeding. In addition, tannic acid has inhibitory effect on some bacteria, which can help treat some infectious diseases of bacteria.
In terms of food, tannic acid can be used as a food additive. In wine production, the amount of tannic acid can increase the taste of wine, make it more mellow, and can help wine clarify and improve the taste of wine. In addition, tannic acid can be used as an antioxidant in some materials and foods, prolonging food oxidation and prolonging the shelf life of food.
Therefore, the use of tannic acid is extensive, and it plays an indispensable role in different fields, which has a deep impact on people's lives.

The physicality of 3-oceanic-2-carboxylic acids is not the same. This is the reason for exploring the characteristics of carboxylic acids in chemistry. Carboxylic acids are compounds containing carboxyl groups (-COOH). Their physical properties are specific, and their molecules are dense.
First of all, its melting temperature. The melting temperature of carboxylic acids is usually higher than that of alcohols with similar molecular weight. This is because in addition to the presence of van der force in the carboxylic acid molecule, the carboxyl group can form a strong force. In the case of acetic acid, the interaction of its molecules is so strong that higher energy is required to break the molecular force, so the melting temperature increases.
Furthermore, its solubility is increased. Carboxylic acids of low carbon atoms, such as formic acid, acetic acid, etc., can be miscible in any proportion of water. This is because the carboxylic group can form water molecules, increasing the strength of water. However, the number of carbon atoms increases, and the solubility of carboxylic acids decreases. Due to the increase in the hydrophobic group of carbon atoms, the number of carbon atoms increases, the hydrophobic action increases, and the interaction between water is weakened. For example, the solubility of n-hexanoic acid in water is small.




, under normal conditions, carboxylic acids, acetic acid, and propionic acid, carboxylic acids containing 4 to 9 carbon atoms are generally also liquid, while carboxylic acids containing more than 10 carbon atoms are mostly solid. This is due to the increase in the number of carbon atoms and the increase in the molecular force, especially the increase in the van der force, which makes the molecules more aggregating and solid.
And its density, generally speaking, the density of carboxylic acids is slightly higher than that of water. However, the density of carboxylic acids is still slightly higher than that of their molecules and molecules.
Of course, the physical rationality of carboxylic acids is affected by factors such as carboxylic groups and carbon groups, and it is of great significance in chemical research and application.

3 - Yanghezhi - 2 - What are the chemical properties of boric acid? Let's listen to my imitation of "Tiangong Kaiwu" and describe it in ancient classical Chinese.
Boric acid has a mild nature and is unique among all chemical substances. At room temperature, boric acid is white crystalline, like fine snow, light in texture and delicate to the touch.
Boric acid has a certain acidity, but compared with strong acid, its acidity is weaker, so it is a genus of weak acid. In water, boric acid can undergo weak ionization, releasing a small amount of hydrogen ions, but the degree of ionization is quite small. This weak acid makes boric acid show a different state in many chemical reactions.
When boric acid meets a base, a neutralization reaction can occur. Like yin and yang, the two blend to form borate and water. This reaction is peaceful and orderly, just like a breeze blowing water, calm. And the borate generated has a wide range of uses in industry, medicine and many other fields.
Furthermore, when boric acid is heated, it also has wonderful changes. When heated to a certain extent, boric acid will gradually lose water, and its morphology and properties will change. This process is like a phoenix nirvana. Although it has undergone changes, it shows different chemical activities in a new state.
In addition, boric acid also has unique capabilities in the field of organic synthesis. It can be used as a catalyst to accelerate the process of certain organic reactions, like a pilot light, guiding the direction of chemical reactions, making the reactions more efficient and accurate.
The chemical properties of boric acid not only have a mild state, but also play a unique role in many reactions. In the vast world of industry, medicine, scientific research, boric acid plays an important role, silently contributing to the development and progress of mankind.

To make triglutaric acid, there are two methods. The first method is to start with glutaric anhydride, after bromination, followed by alkali, which can be obtained. The details are as follows: First, take glutaric anhydride, place it in a suitable device, and meet with a brominating agent, so that bromine atoms enter the structure of glutaric anhydride to form brominated glutaric anhydride. Second, slowly inject it with alkali solution, hydrolyze and rearrange all changes, and triglutaric acid is formed.
The second method is to use diethyl malonate and acrylic acid as materials, and prepare it by condensation, hydrolysis and decarboxylation. At first, diethyl malonate and acrylic acid are condensed under suitable conditions to obtain an intermediate. Second, the intermediate is hydrolyzed with water and an appropriate catalyst to change the ester group to a carboxyl group. At the end, decarboxylation is carried out by heating to remove carbon dioxide, and tripentenedioic acid is obtained.
These two methods have their own advantages and disadvantages. The former step is slightly simpler, but the control of bromination is more difficult, and the brominating agent is toxic and corrosive, so it needs to be handled with caution. The raw materials used in the latter are easier to induce, and the reaction conditions are milder, but the steps are slightly more complicated, and the selection rate and yield of condensation reaction vary depending on the conditions, and need to be studied and optimized in detail. In short, in order to obtain high-purity tripentenedioic acid, we should carefully choose the method according to the availability of raw materials, the quality of equipment, and the cost, and fine-tune the conditions in the experiment to improve the environment.

In today's market, the quality of the trifid acid is determined by an emergency, and it is controlled by the same reasons.
One of them is the main reason for the difference between the land and the earth. If the soil is plump and the material is not available, the amount of trifid acid produced will be sufficient, and the market will be slightly flat. However, if it is in a remote and desolate place, where the source is scarce, its mining and production will all go through setbacks, and the price will definitely go up.
Second, there are also implications for the production of trifid acid. It is worth five years to climb, and the prosperity of hundreds of materials is easy to obtain. The cost of trifid acid may decrease, and the market will also fall. In bad years, the raw materials are scarce, and the high cost will be suppressed.
Third, the need for the left and right. If the world's demand for trihomogeneous acids is like a river embankment, the supply is not in demand, and the business price must be lifted. On the contrary, if there is a small demand, the supply is in demand, and the price is low.
Generally speaking, the cost of trihomogeneous acids in the city is less than 10% per catty, and more than 100%. Its special situation is caused by the above-mentioned reasons. Business is good, the degree is good, and the reasons are clear. Only then can we obtain its benefits and avoid its harm.