3-Bromobenzoic acid is an organic compound with unique chemical properties and a wide range of uses in many fields.
In terms of acidity, the carboxyl group confers the acidity of 3-bromobenzoic acid. The hydrogen atoms in the carboxyl group can be partially ionized, releasing hydrogen ions, thus exhibiting acidity. In water, it can neutralize with bases, such as with sodium hydroxide. The hydrogen ion in the carboxyl group combines with the hydroxide ion to form water, and itself forms a sodium salt of 3-bromobenzoate. This reaction reflects its acidic properties. In organic synthesis, this property is often used to prepare 3-bromobenzoate compounds, which are used for specific reactions or as intermediates.
From the perspective of substitution reaction, hydrogen atoms on the benzene ring have specific reactivity due to the influence of carboxyl groups and bromine atoms. Under appropriate conditions, electrophilic substitution reactions can occur on the benzene ring. For example, in the presence of suitable catalysts, halogenation reactions can occur with halogenating agents to introduce new halogen atoms at other positions in the benzene ring; nitrification reactions can also occur with nitrifying reagents to introduce nitro groups. This is because the carboxyl group is an electron-withdrawing group and the bromine atom is an ortho-para-site locator. The combined action of the two determines the density distribution of electron clouds at different positions on the benzene ring, which in turn affects the location and difficulty of electrophilic substitution reactions.
In addition, bromine atoms of 3-bromobenzoic acid can participate in a variety of It has certain reactivity, and under suitable reagents and conditions, nucleophilic substitution reactions can occur. For example, it can react with nucleophilic reagents containing hydroxyl groups and amino groups, and bromine atoms are replaced by nucleophilic reagents to generate corresponding compounds containing new functional groups. This reaction is crucial in building complex organic molecular structures. Through the transformation of bromine atoms, various functional groups can be introduced to expand the structure and function of compounds.
In some organic synthesis routes, 3-bromobenzoic acid can be used as a starting material. By virtue of its acidity, benzene ring substitution reaction and bromine atom reactivity, more complex and functional organic compounds can be gradually constructed, which play an important role in drug synthesis, materials science and other fields.

3-Tyrosine acid, also known as L-dopa (L-DOPA), is an important biological compound. It is widely used in various domains such as food and food. It is as follows:
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Its main use is in the treatment of Parkinson's disease. Parkinson's disease is caused by the degeneration of dopaminergic energy in the black domain of the body, resulting in insufficient dopamine secretion. And 3-tyrosine tyrosine, as a direct precursor to dopamine, can improve the blood barrier. Once it is introduced into the body, it will reduce dopamine under the action of aromatic acid carboxylase, and reduce the deficiency of dopamine in patients. It can effectively improve the health of patients with Parkinson's disease, and greatly improve their quality of life.
** Food field **:
Some foods also add 3-tyramine acid, because it has certain health benefits. For example, it can improve mental function, or help people's health and improve their mood. For those who are depressed and sleep poorly due to high mental energy, foods containing 3-tyramine acid may have certain health effects. In addition, in some foods, 3-tyrosine acid is also useful. It can improve muscle strength and endurance, and help improve performance in terms of performance and performance.
** Research field **:
3-tyrosine acid is also an important tool in neuroscience research. By using 3-tyrosine acid, researchers can delve deeper into the physiological and pathological mechanisms of dopaminergic diseases. For example, in the study of the treatment of certain neurodegenerative diseases, 3-tyrosine acid is used to investigate its biological activity and treatment, and to provide a rationale for disease prevention and control strategies.

The synthesis method of 3-bromobenzoic acid is not directly described in the ancient book "Tiangong Kaiwu", but according to the ancient chemical process principle and related books, the method may be obtained.
First, using benzoic acid as the starting material, the method of bromination can be obtained. Under the conditions of ancient chemical experiments, benzoic acid can be prepared first and placed in ceramic vessels. Sulfur and saltpeter are mixed in appropriate proportions to make a combustion aid and heat the pottery. When the benzoic acid is slightly melted, bromine is slowly added. Bromine can be extracted from seawater and purified by distillation. In this process, the reaction phenomenon is closely observed, and the control of the temperature is the most important. In ancient chemical processes, the control of the temperature is about success or failure. Under appropriate conditions, benzoic acid and bromine can be substituted to form 3-bromobenzoic acid. This reaction may require multiple attempts to find the best ratio and reaction time.
Second, starting from toluene, nitrate is first prepared from m-nitrotoluene. The ancient production of nitrate is mostly derived from saltpeter. Mix saltpeter, charcoal, and sulfur in a certain proportion and heat the reaction to obtain nitric acid. React with nitric acid and toluene to obtain m-nitrotoluene. Then, the m-nitrotoluene is reduced to m-amino toluene. The ancient reduction method may use iron powder and hydrochloric acid to react at a suitable temperature. After diazotization and bromination, 3-bromobenzoic acid can be finally prepared. There are many steps in this process, but each step has its own method. In the process of diazotization, it is necessary to precisely control the temperature and the ratio of reagents to prevent the reaction from getting out of control. When bromiding, it is also necessary to pay attention to the amount of bromine and the reaction environment.
Third, 3-bromobenzoic acid is obtained by oxidation of m-bromotoluene as raw material. In the ancient oxidation method, a strong oxidant such as potassium permanganate can be selected. Put m-bromotoluene and potassium permanganate in water, heat and stir. For potassium permanganate, it can be obtained in the mine veins in the mountains, and it can be used after refining and purification. During the reaction process, pay attention to adjusting the pH of the solution to promote the oxidation reaction. After the reaction, after separation and purification, pure 3-bromobenzoic acid can be obtained. Purification method, or recrystallization, water or appropriate organic solvent, multiple crystallization, can improve the purity of the product.

During the storage and transportation of 3-hydroxybutyric acid, many key matters need to be paid attention to.
When it is stored, the first priority is the environment. When it is suitable to be in a cool, dry and well-ventilated place, it must not be placed in direct sunlight or in a place with severe temperature fluctuations. Because the temperature is too high, or 3-hydroxybutyric acid is chemically reacted, causing its properties to change. As "Tiangong Kaiwu" said, "everything has its own nature, and it will exist if it goes along with it, and it will die if it goes against it." 3-hydroxybutyric acid also has its own "nature", and this environment will go along with it.
Furthermore, storage containers are essential. It is necessary to use a corrosion-resistant and well-sealed container to prevent 3-hydroxybutyric acid from leaking or reacting with external substances. I still remember that the ancients stored medicine and chose excellent tools to ensure the efficacy of the medicine. The same is true.
As for the transportation, be sure to ensure that the packaging is firm. "A journey of a thousand miles begins with a single step". Stable packaging is the foundation of transportation safety. The means of transportation must be clean and free of other substances that may react with it. During driving, the speed is smooth, avoid bumps and vibrations, and avoid damage to the packaging.
In addition, relevant personnel must have a detailed understanding of the characteristics of 3-hydroxybutyric acid. Know its chemical properties, and in case of emergencies, you can know how to deal with it properly. For example, when the ancients boated, they were familiar with water-based transportation to ensure stable navigation, and when transporting 3-hydroxybutyric acid, they also needed to be familiar with its properties, so that the storage and transportation process could be safe and secure, and the quality of 3-hydroxybutyric acid would not be affected.

3-Pentenobutyric acid is an organic compound that is used in many fields such as chemicals, pharmaceuticals, and fragrances. Its market price is determined by many factors such as raw material cost, production process, market supply and demand, and fluctuates frequently, and varies depending on quality, purity, trading area, and trading time.
There is no exact public data to clarify its specific price range. If you want to know its market price roughly, you can use the following channels: First, chemical product trading platforms. Many online chemical product trading platforms will list the quotations of various chemicals. You can log in to such platforms to find the price information of 3-Pentenobutyric acid according to product specifications, purity and other parameters. However, you need to pay attention to the differences in quotations from different merchants, and the price may fluctuate with the market. Second, chemical raw material suppliers. Directly contact chemical raw material suppliers to inquire about the price of 3-pentylbutyric acid, and the supplier will provide corresponding quotations according to factors such as demand quantity, delivery location, payment method, etc. Third, industry exhibitions and seminars. Exhibitions and seminars in the chemical industry bring together many enterprises and professionals, where you can communicate with relevant practitioners to obtain information such as the market price of 3-pentylbutyric acid.
In short, due to the dynamic changes in the market, the market price of 3-pentylbutyric acid is difficult to generalize. It is necessary to go through the above multiple channels and combine the specific transaction situation to obtain a relatively accurate price range.