1,3-Dibromo-4-chlorobenzene is an important raw material in organic synthesis. It has a wide range of uses and has significant effects in many fields.
First, in the field of medicinal chemistry, this compound is often a key intermediate. Drug molecules with specific pharmacological activities can be derived through a series of chemical reactions. For example, in the synthesis of some antibacterial and anti-inflammatory drugs, 1,3-dibromo-4-chlorobenzene can be used as a starting material. After ingenious chemical modification, it can gradually construct a drug structure with precise curative effect, making great contributions to human health.
Second, in the field of materials science, it also plays an important role. Can be used to prepare functional polymer materials. By polymerizing with other monomers, the material is endowed with special properties, such as excellent thermal stability, good electrical properties, etc. Such materials may be applied to electronic devices, optical materials and other fields to promote technological innovation in related industries.
Furthermore, in the field of pesticide chemistry, 1,3-dibromo-4-chlorobenzene is also indispensable. Based on it, highly efficient pesticide ingredients can be synthesized. Such pesticides may have unique insecticidal and herbicide mechanisms, which can effectively protect crops from pests and diseases, improve crop yield and quality, and ensure the stability and development of agricultural production.
In conclusion, 1,3-dibromo-4-chlorobenzene has shown important application value in many fields such as medicine, materials, and pesticides due to its special chemical structure, which is of great significance for promoting scientific and technological progress in various fields and industrial development.

1% 2C3-dibromo-4-vinylbenzene is an organic compound with the following physical properties:
First, looking at its properties, under room temperature and pressure, 1% 2C3-dibromo-4-vinylbenzene is a colorless to light yellow liquid, clear and has a special aromatic aroma. This unique state and taste can be used as a preliminary judgment in many scenarios of chemical synthesis.
Second, its boiling point is about 240-250 ° C. The higher boiling point indicates that the intermolecular force is quite strong. When separating, purifying and reacting conditions are controlled, precise temperature control is required to achieve the expected chemical changes.
Third, measure its melting point, roughly in the range of -10 ° C to 0 ° C. The lower melting point causes the substance to be liquid at room temperature, which is convenient for participating in various chemical reactions in the solution system, which greatly facilitates chemical operation.
Fourth, its density is about 1.8-1.9 g/cm ³, which is heavier than water. If it is in water, it will sink to the bottom. This property is of great significance in the separation of mixtures and the control of the reaction phase.
Fifth, study its solubility. 1% 2C3-dibromo-4-vinylbenzene is insoluble in water, but easily soluble in common organic solvents such as ethanol, ether, dichloromethane, etc. This makes organic solvents the preferred choice when selecting reaction solvents and product extractants, which can effectively improve the reaction efficiency and product purity.
Sixth, check its stability. Under conventional temperature and pressure conditions, 1% 2C3-dibromo-4-vinylbenzene is relatively stable. However, the carbon-carbon double bonds and bromine atoms in its molecules are quite active, and under extreme conditions such as strong oxidants, strong acids, strong bases, or high temperature and light, it is easy to cause chemical reactions, or cause double bond addition, bromine atom substitution and other changes.

1% 2C3-dibromo-4-pentenonitrile has stable properties.
1% 2C3-dibromo-4-pentenonitrile, its chemical structure endows it with certain stability at room temperature and pressure. From the perspective of molecular composition, the carbon-carbon double bond interacts with the nitrile group and the bromine atom to form a relatively stable system. Under normal environmental conditions, such as room temperature (about 20-25 degrees Celsius) and room pressure (about 101.3 kPa), the substance is not prone to spontaneous and violent chemical changes.
However, its stability is not absolute. In case of high temperature, the intra-molecular energy increases and the chemical bond activity increases, which may trigger decomposition reactions, such as carbon-bromine bonds and carbon-carbon double bonds breaking, resulting in the formation of small molecule substances. When encountering strong oxidizing agents, there are unsaturated bonds in the molecule, which are easily oxidized, resulting in the destruction of carbon-carbon double bonds and the change of their chemical structure and properties. When encountering strong reducing agents, nitrile groups may be reduced to form different substances such as amines.
In summary, 1% 2C3-dibromo-4-pentenyl nitrile is relatively stable chemically under conventional conditions, but under certain extreme conditions or specific chemical environments, the stability will be broken and chemical reactions will occur.

The synthesis method of 1,3-dibromo-4-chlorobenzene, although the synthesis of this specific compound is not directly described in books such as Tiangong Kaiji, it can be deduced from traditional chemical process ideas.
To make this compound, you can first take appropriate aromatic hydrocarbons, such as benzene. In the ancient method, benzene can be obtained by fractional distillation of coal tar. Although the understanding at that time may not be as accurate as today, there are ways to obtain it.
One method can first halogenate benzene. In ancient times, there was a method of reacting halogenating agent with aromatic hydrocarbons. Taking chlorine as an example, you can use iron filings as a catalyst in a suitable container to react benzene with chlorine to obtain chlorobenzene. This step requires temperature control and reaction process. Due to the limited conditions at that time, temperature control or observation based on experience and temperature, so that the reaction is moderate and does not over-chlorinate.
Then, re-brominate chlorobenzene. Bromine can be selected. Under similar catalytic conditions, such as catalysis with iron powder, bromine reacts with chlorobenzene. This process requires attention to the amount of bromine and the reaction environment. Bromine is volatile and corrosive, and ancient craftsmen should be careful. After this bromination reaction, it is expected to obtain 1,3-dibromo-4-chlorobenzene. However, due to the complex reaction, or the accompanying various by-products, it is not easy to separate and purify by ancient methods. At that time, distillation, crystallization and other means were used to separate according to the boiling point and solubility of each product. Distillation requires special distillation equipment to control the heat to reach a suitable temperature to allow the product to be distilled out one after another; crystallization requires the selection of a suitable solvent to allow the target product to crystallize and precipitate and remove impurities. However, multiple operations are required to obtain a relatively pure 1,3-dibromo-4-chlorobenzene.

When storing and transporting 1% 2C3-dibromo-4-pentenonitrile, it is necessary to pay attention to many key matters.
First, it concerns the storage environment. This substance should be placed in a cool, dry and well-ventilated place, away from fire and heat sources. Because of its certain chemical activity, high temperature or open flame can easily cause danger. If stored in a humid environment, it may react with water vapor, causing deterioration and affecting its quality and stability. And should be stored separately from oxidants, acids, bases, etc., and must not be mixed to prevent mutual reaction and unexpected changes.
Second, the transportation process cannot be ignored. Be sure to ensure that the packaging is complete and sealed before transportation. Packaging materials need to be able to effectively resist vibration, collision and friction, and prevent material leakage caused by container damage. During transportation, the relevant regulations on the transportation of hazardous chemicals should be strictly followed, and corresponding emergency treatment equipment and protective equipment should be equipped. Transportation vehicles should be kept clean, and no other substances that can react with them should be left. Transportation personnel also need to undergo professional training, be familiar with the characteristics of the substance and emergency treatment methods, regularly check the status of the goods during transportation, and take appropriate measures immediately once any abnormality is detected.
Furthermore, whether it is storage or transportation, the substance needs to be clearly marked, with its name, dangerous characteristics and other key information, so that relevant personnel can identify and deal with it. Only in this way can we ensure safety to the greatest extent and avoid accidents during the storage and transportation of 1% 2C3-dibromo-4-pentenonitrile.