2,5-Dibromo-3-fluoropyridine

2% 2C5-dibromo-3-pentenonitrile, which is a key intermediate in organic synthesis. In the field of organic chemistry, its application is quite extensive.
First, in the field of drug synthesis, it is often used as a key structural block. The construction of many drug molecules requires the introduction of specific functional groups and carbon skeletons to shape structures with specific pharmacological activities. For example, in the synthesis of some anti-tumor drugs, 2% 2C5-dibromo-3-pentenonitrile will be used to construct molecular structures that are in line with the target of tumor cells through subsequent chemical reactions, achieving the purpose of inhibiting tumor cell growth and proliferation.
Second, in the field of materials science, it also has outstanding performance. It can be used as a starting material for the synthesis of polymer materials with special properties. Through a carefully designed polymerization reaction, its structural units are introduced into the polymer chain, giving the material unique optical and electrical properties. For example, the preparation of polymer materials with specific fluorescence emission characteristics is very useful in photoelectric display, biological imaging, etc.
Third, in the total synthesis of natural products, 2% 2C5-dibromo-3-pentenonitrile plays an irreplaceable role. Natural products often have complex structures and excellent biological activities. When fully synthesized, this compound can provide an effective way to build complex carbon ring or heterocyclic structures, enabling researchers to accurately reproduce the structure of natural products and further explore their biological activities and mechanisms of action.

2% 2C5-dibromo-3-pentenal aldehyde is an organic compound, which has the following physical properties:
In terms of normal conditions, it may be a liquid, and due to the conjugated structure in the molecule, it may show a little special color. This conjugated system allows the molecule to absorb light of specific wavelengths, or it may be slightly yellow to light brown and other colors.
Smell, because of its aldehyde group, it may have a stimulating and special odor, and aldehyde substances often have such odors, which are easy to identify on the sense of smell.
Measure its melting boiling point, because the molecule contains unsaturated double bonds and polar aldehyde groups, the intermolecular force is different from that of saturated compounds. The double bond makes it difficult for the molecules to be closely arranged, and the aldehyde group enhances the polarity of the molecule and enhances the intermolecular force. Under the combined action, its boiling point is slightly higher than that of saturated compounds with similar molecular weights, and the melting point is also affected by the structure, which is in a specific range. However, the exact value needs to be accurately determined experimentally.
In terms of its solubility, due to the presence of polar aldehyde groups, it has a certain solubility in polar solvents such as water. The aldehyde group can form hydrogen bonds with water molecules to increase its solubility. However, the non-polar carbon chain part limits its solubility in water, so the solubility in water may be limited. In organic solvents such as ethanol and ether, due to the principle of similar miscibility, the solubility may be better.
In terms of its density, compared with water, due to the molecular structure and the type and number of atoms, or different from water, the specific value depends
This is an inference of the physical properties of 2% 2C5-dibromo-3-pentenal based on the chemical structure and properties of common organic compounds. The actual properties need to be verified by experiments.

2% 2C5-dibromo-3-pentenonitrile has relatively stable chemical properties. This substance contains special functional groups, and bromine atoms coexist with carbon-carbon double bonds and cyanide groups. Bromine atoms have certain electronegativity. Although they can participate in reactions such as nucleophilic substitution, the activity of bromine atoms is restricted to a certain extent due to the conjugation effect of double bonds and cyanyl groups in the molecule.
Although the carbon-carbon double bond has the potential activity of addition reaction, the presence of cyanyl groups changes the distribution of electron clouds, so that the electron cloud density of double bonds is not as high as that of ordinary simple olefins, and the addition reaction activity is also affected. The cyanyl group is relatively stable and usually requires more severe conditions to make it react. For example, in the case of strong acid or strong base and heating, reactions such as hydrolysis may occur.
And the conjugate system of the molecule makes the overall energy of the molecule reduce and the structure tends to be stable. Under general environmental conditions, without specific reagents and conditions, this 2% 2C5-dibromo-3-pentenonitrile can maintain a relatively stable state and is not prone to spontaneous significant chemical reactions. However, in the special scene of organic synthesis, if suitable conditions and reagents are provided, the characteristics of each functional group can be cleverly used to achieve specific reaction transformations to prepare the desired organic compounds.

There are many methods for the synthesis of 2% 2C5-dibromo-3-pentenone, which are described in detail by you.
First, it can be started from compounds containing allyl structures. Take allyl alcohols, undergo bromination reaction, and use appropriate brominating reagents, such as bromine ($Br_2 $). Under suitable reaction conditions, such as low temperature and suitable solvent environment, hydrogen at the allyl position can be replaced by bromine atoms to obtain bromine-containing allyl derivatives. Subsequently, through the oxidation step, a suitable oxidizing agent can be used, such as Jones reagent ($CrO_3 - H_2SO_4 $), to oxidize the alcohol hydroxyl group to carbonyl, so that the target product can be obtained 2% 2C5-dibromo-3-pentenone.
Second, pentenoic acid and its derivatives are used as raw materials. First, pentenoic acid is used with a brominating reagent, and bromine can also be used to bromide under suitable conditions, so that the bromine atom is substituted in a specific position to form a bromine-containing pentenoic acid derivative. After the decarboxylation reaction, it is often necessary to remove carbon dioxide from the carboxyl group under high temperature and a specific catalyst environment, so as to obtain the target 2% 2C5-dibromo-3-pentenone.
Third, use the conjugate addition reaction strategy. Select suitable conjugated ketenes, such as 2-pentenone, and carry out conjugate addition with brominating reagents. When hydrogen bromide ($HBr $) is used as the bromine source, in the presence of suitable catalysts, such as peroxides, $HBr $can perform anti-Martensitic addition to the conjugated ketenes, and the bromine atom is added to the terminal carbon of the conjugated system. After that, another bromine atom is introduced, and after appropriate bromination steps, 2% 2C5-dibromo-3-pentenone is finally synthesized.
The above methods have their own advantages and disadvantages. The experimenter should choose the appropriate method to conduct the synthesis experiment according to the actual needs, such as the availability of raw materials, the difficulty of controlling the reaction conditions, and the purity requirements of the target product.

I look at what you said about "2,5-dibromo-3-hexyne", which is a special compound in organic chemistry. As for its market price, it is difficult to say for sure.
The price of this compound is often influenced by many factors. First, the difficulty of obtaining raw materials and the price. If the raw materials required for its preparation are scarce and expensive, the cost of this compound will be high, and the market price will also rise. Second, the preparation process is simple. If the synthesis of this "2,5-dibromo-3-hexyne" requires complex steps and harsh reaction conditions, such as high temperature, high pressure, special catalysts, etc., it requires a lot of manpower, material resources, and financial resources, and its price is naturally high. Third, the amount of market demand. If an industry has strong demand for this compound and relatively insufficient supply, its price will rise; conversely, if there is little demand and excess supply, the price will fall.
And different merchants and different purity specifications have different prices. High-purity "2,5-dibromo-3-hexyne", due to the difficulty of preparation and high requirements for impurity removal, the price is often much higher than that of ordinary purity.
However, it is difficult to know exactly what the current market price is. To obtain accurate prices, you should consult chemical product suppliers, relevant chemical trading platforms, or professionals in the chemical industry to obtain more accurate price information.