3-Pyridinecarboxylic acid, 2-fluoro-

2-%E6%B0%9F-3-%E5%90%A1%E5%95%B6%E7%94%B2%E9%85%B8%E6%9C%89%E5%A4%9A%E7%A7%8D%E5%8C%96%E5%AD%A6%E6%80%A7%E8%B4%A8%EF%BC%8C%E4%B8%8B%E6%96%B9%E4%B8%80%E4%B8%8D%E5%88%97%E6%95%B0%E5%90%8D%E8%AF%B4%E6%98%8E%E3%80%82
** 1. Acidic **
This acid has the general nature of acid and can react with a variety of substances. First, it can interact with active metals. If it meets zinc, hydrogen will escape. The reaction formula is:\ (Zn + H_2A\ longrightarrow ZnA + H_2 ↑\), which is a typical replacement reaction. The hydrogen in the acid is replaced by the metal. Second, it can combine with the base phase and undergo a neutralization reaction. For example, it reacts with sodium hydroxide to form salt and water. The reaction formula is:\ (H_2A + 2NaOH\ longrightarrow Na_2A + 2H_2O\), which is an example of acid-base neutralization. Third, it can react with certain salts. In case of calcium carbonate, new salts, water and carbon dioxide will be generated. The reaction formula is:\ (H_2A + CaCO_3\ longrightarrow CaA + H_2O + CO_2 ↑\), which is the embodiment of strong acid to weak acid.
** 2. Oxidation **
Under certain conditions, 2-ene-3-pentyl acid is oxidizing. When it meets with a reducing agent, the valence state of the elements in the acid will decrease. For example, when encountering some low-priced metal ions, it can be oxidized and itself is reduced. In this process, the acid acts as an oxidizing agent and exhibits the ability to obtain electrons, which prompts other substances to oxidize. < Br >
** 3. Reductivity **
Although it is an acid, it also has certain reductivity. In the face of strong oxidants, some elements in the acid can increase their valence state and be oxidized. In case of strong oxidants such as permanganic acid, 2-ene-3-pentyl acid will undergo oxidation reaction, and some of its own elements will increase their valence state, showing the characteristic of lost electrons, which is the performance of its reductivity.

** 4. Esterification reaction **
This acid contains carboxyl groups and can be esterified with alcohols. When co-placed with ethanol in concentrated sulfuric acid and heated environment, esters and water will be formed. The reaction formula is:\ (H_2A + C_2H_5OH\ stackrel {concentrated sulfuric acid} {\ underset {\ Delta} {\ rightleftharpoons}} C_2H_5A + H_2O\). This reaction is an important type of reaction in organic chemistry. The resulting esters have a special aroma and are widely used in the fields of fragrances.
** 5. Addition reaction **
Due to the carbon-carbon double bond in the molecule, 2-ene-3-pentyl acid can undergo an addition reaction. Addition with hydrogen, the double bond is opened, and hydrogen atoms are added to the carbon atoms at both ends of the double bond to form a saturated acid. The reaction formula is:\ (H_2A + H_2\ stackrel {catalyst} {\ longrightarrow} H_4A\); when met with halogen elements such as bromine water, bromine atoms will be added to the double bond, causing the bromine water to fade. This is a common method for identifying carbon-carbon double bonds.

The main use of 2-% pentyl-3-alkenyl butyric acid is to play a key role in the field of organic synthesis.
First, it can be used as a starting material for the synthesis of many bioactive compounds. In the field of medicinal chemistry, with its unique chemical structure, complex molecular structures with specific pharmacological activities can be constructed through a series of chemical reactions. For example, in the development and synthesis of some new anti-cancer drugs or anti-inflammatory drugs, 2-% pentyl-3-alkenyl butyric acid can be used as an important basic structural unit, providing a key starting framework for subsequent drug molecular modification and optimization.
Second, it also has important value in the synthesis of fragrances. Because its structure can endow fragrances with unique odor characteristics, it can be used to prepare various high-end flavors and fragrances. For example, in the creation of some floral or fruity flavors, 2-% pentyl-3-alkenyl butyric acid can be used as a key ingredient to add the natural sense and layering of flavors, improve their aroma quality and uniqueness, and then widely used in perfumes, cosmetics, food additives and other industries to meet people's diverse needs for aroma.
Furthermore, it also shows certain application potential in the field of materials science. Polymer materials with special properties can be prepared by polymerization with other monomers. For example, synthesizing polymers with specific flexibility, stability or optical properties can be used in packaging materials, coatings and other fields, providing new ways and options for material performance optimization. In conclusion, 2-% pentyl-3-alkenyl butyric acid, with its unique chemical structure, has significant uses in several branches of organic synthesis, promoting the development and innovation of drugs, fragrances, materials, and other industries.

To prepare 2-alkyne-3-pentenoic acid, the following methods can be used:
First, propargyne and bromoethane are used as the beginning, and 2-pentenyne is obtained by the formation and nucleophilic substitution of sodium alkyne. Then 2-pentenyne is reacted with borohydride reagent, followed by treatment with hydrogen peroxide basic solution to obtain 2-pentenal. After oxidation, 2-alkyne-3-pentenoic acid is finally obtained. The process steps are complicated, but the reaction of each step is controllable. < Br > Second, with acetylene and acetaldehyde as the base, under the catalysis of strong base, the nucleophilic addition of acetylene negative ions to acetaldehyde to obtain 3-hydroxy-1-propane. After dehydration to propane aldehyde, it reacts with ethylmagnesium bromide Grignard reagent to obtain 3-pentene-1-alkylene-3-ol. After oxidation to obtain 2-alkylene-3-pentanoic acid. In this way, the reaction between acetylene and aldehyde and ketone is cleverly used, and the raw materials are common.
Third, with 1,3-pentadiene as the starting point, the double bond is cut off by ozonation to obtain malondialdehyde and acetaldehyde. Under the action of strong alkali, malondialdehyde and acetaldehyde are condensed and dehydrated by hydroxyaldehyde to obtain 2-alkynyl-3-pentenal, and then oxidized to obtain 2-alkynyl-3-pentenoic acid. This diameter makes good use of the characteristics of diolefins, and the raw materials are economical.
Fourth, ethyl propionate and vinyl magnesium bromide are used as materials to obtain 2-alkynyl-3-pentenoic acid through Grignard reaction, and the target product is hydrolyzed to obtain 2-alkynyl-3-pentenoic acid. The method reacts with Grignard reagents under mild conditions.
The above methods have their own advantages and disadvantages, and the method should be selected according to the availability of raw materials, cost, yield and reaction conditions.

I look at your question, but I am inquiring about the price of 2-ene-3-pentenoic acid in the market. I cherish it, in my life, there is no such thing, and it is difficult to know its market price. However, it can be deduced, the price depends on various factors.
First, it is difficult to produce. If the process of producing this product is complicated and requires rare materials, and with exquisite methods, the cost of human, material and financial resources is huge, the price will be high. On the contrary, if the production is easy, the material is common, the law is simple, and the price is cheap.
Second, how much to ask. If everyone asks for this product and uses it in various karma, and wants to be prosperous in supply, the price will rise. < Br >
Third, the competition of the city. If there are many people who produce this product, they compete with each other, to attract customers, or to reduce their prices. If there are only a few properties, there is a tendency to dominate, and the price may be controlled by it.
Fourth, time and place. At different times, in different places, prices vary. Or because of changes in time, the abundance of materials is sorry, or because of differences in places, the difficulty of transportation is easy, resulting in different prices.
Although it is difficult to determine the price of 2-ene-3-pentenoic acid, the approximate price can be measured according to this number. The market conditions are changing rapidly, and prices are also impermanent. To know the true price, one needs to study the real-time market conditions.

2-%E6%B0%9F-3-%E5%90%A1%E5%95%B6%E7%94%B2%E9%85%B8%E8%80%8C%E8%A7%81%E5%9C%A8%E4%B8%96%E4%B9%8B%E9%97%B4%E7%9A%84%E5%82%A8%E5%AD%98%E6%9D%A1%E4%BB%B6%EF%BC%8C%E7%A1%AE%E4%B9%8B%E5%85%B6%E8%90%A5%E7%94%A8%E4%B9%8B%E5%A4%87%E4%B9%8B%E5%85%B7%E3%80%82
This acid is dissolved by water, and steamed when heated. It is active and easy to combine with other things. If you want to save it, you must choose a cool and dry place, avoid direct sunlight, and do not get close to fire and hot objects. Cover sunlight and heat, both can promote its transformation, so that it loses its original state.
And its device must be sealed to prevent its gas from escaping outside. If the gas is released, not only the amount of this acid will be reduced, but its properties will also change, or it will cause harm to the surrounding things. A sealed device should be made of someone who is resistant to its corrosion, such as a special glassware or a device made of certain metals, but the selected metal must not be phased with the acid before it can be used. < Br >
It must also be kept away from all alkalis. Alkalis and acids are resistant to each other. If they come into contact, they will cause severe reactions, or generate heat, gas, or even risk. In the storage place, it is necessary to prepare corresponding protective equipment and neutralizing agents, just in case of leakage, which can be dealt with quickly to avoid major disasters.
The storage place should also be clearly marked, so that people can know at a glance that it is 2-3-acetic acid, and know that its sexual risk should not be ignored. All these are the essential principles for the existence of this acid. If you follow them, you can ensure their safety, and if you use them, you can do your best.