What are the main uses of 1,2-dibromo-3-fluorobenzene?

1% 2C2-dibromo-3-chloropropane is mainly used in agriculture as a soil fumigant to control nematode diseases and some soil pests in various crops.

Its mechanism of action is that it can volatilize and spread in the soil, which is toxic to nematodes and other pests, and interferes with their normal physiological activities, such as destroying the nervous system of nematodes, affecting their respiration and reproduction processes, thereby inhibiting or killing nematodes in the soil, ensuring the healthy growth of crop roots, and improving crop yield and quality. For example, in the cultivation of crops such as tobacco, peanuts, and bananas, it has been widely used to deal with the threat of nematode diseases.

However, with the deepening of research, it was found that 1% 2C2-dibromo-3-chloropropane is highly toxic, not only has potential harm to the environment, such as possible pollution of soil and groundwater, but also has a greater risk to human health, which can cause serious consequences such as male infertility. Therefore, many countries have successively banned its production and use to maintain ecological environment safety and human health.

What are the physical properties of 1,2-dibromo-3-fluorobenzene?

1% 2C2-dibromo-3-chloropropane is an organic halide with special physical properties. Its properties are colorless to light yellow liquid with a chloroform-like odor. This substance is relatively stable at room temperature and pressure. In case of hot topics, open flames or strong oxidants, it will be at risk of combustion and explosion.

Its boiling point is about 196-198 ° C, and its density is higher than that of water, about 1.93g/cm ³. It is insoluble in water, but it can be miscible with most organic solvents such as ethanol, ether, acetone, etc.

1% 2C2-dibromo-3-chloropropane was once widely used in agriculture as a soil fumigant to prevent and control nematodes and other soil pests. However, due to its high toxicity, teratogenicity and carcinogenicity, it is very harmful to human health and the environment, and is now banned in many countries.

Looking at its physical properties, its odor and color are conducive to identification, and its density and solubility determine its distribution and migration in the environment. The boiling point characteristic is related to its phase change under different temperature conditions. The many physical properties of this substance have made it show unique effects in past applications, but it has also been abandoned due to its significant harm. We need to have a deep understanding of the properties of such substances in order to ensure the safety of production and life while also protecting the ecological environment.

What are the chemical properties of 1,2-dibromo-3-fluorobenzene?

1% 2C2-dibromo-3-chloropropane is an organic halide. Its chemical properties are unique and have the generality of halogenated hydrocarbons.

In this compound, the presence of bromine and chlorine atoms endows it with many special chemical properties. Due to the strong electronegativity of halogen atoms, the electron cloud in the molecule is unevenly distributed, and the carbon-halogen bond is polar. Therefore, 1% 2C2-dibromo-3-chloropropane is prone to nucleophilic substitution reactions. Nucleophiles can attack partially positively charged carbon atoms, and halogen atoms leave as leaving groups to form new compounds. < Br >
And because it contains multiple halogen atoms, under appropriate conditions, elimination reactions may occur. Halogen atoms and hydrogen atoms on adjacent carbon atoms in the molecule, under the action of bases and other reagents, dehalide hydrogen, form carbon-carbon double bonds, and construct unsaturated structures.

Furthermore, 1% 2C2-dibromo-3-chloropropane can be used in some chemical reactions, or can act as a halogenation reagent, introducing halogen atoms to other organic compounds to change their chemical properties and reactivity. And its chemical properties are significantly affected by reaction conditions, such as temperature, solvent, catalyst, etc. The temperature increases, or the reaction rate is accelerated; the specific solvent may have an effect on the reaction selectivity. < Br >
However, it should be noted that such halogenated hydrocarbons are toxic and environmentally persistent due to the presence of halogenated atoms. When using and handling, they should follow the corresponding safety regulations and environmental protection requirements to avoid harm to organisms and the environment.

What are the preparation methods of 1,2-dibromo-3-fluorobenzene?

To make 1,2-dibromo-3-chloropropane, there are several ancient methods:

First, propylene is added to chlorine first. Propylene has a carbon-carbon double bond and combines with chlorine to obtain 3-chloropropene. The reaction is as follows:
\ (CH_ {2} = CH - CH_ {3} + Cl_ {2}\ stackrel {light or heat }{=\!=\! =} CH_ {2} = CH - CH_ {2} Cl + HCl\)
Then 3-chloropropene is added to bromine again, the carbon-carbon double bond is broken, and the bromine atoms are added to both ends, resulting in 1,2-dibromo-3-chloropropane. The reaction formula is:
\ (CH_ {2} = CH - CH_ {2} Cl + Br_ {2}\ stackrel {}{=\!=\! =} CH_ {2} Br - CHBr - CH_ {2} Cl\)

Second, propylene and hydrogen bromide can be added first. Due to the asymmetric double bond of propylene, hydrogen is added to the carbon containing more hydrogen to obtain 2-bromopropane. The reaction is:
\ (CH_ {2} = CH - CH_ {3} + HBr\ stackrel {}{=\!=\!=} CH_ {3} -CHBr - CH_ {3}\)
2-bromopropane reacts with chlorine, and the control conditions make the chlorine replace the hydrogen at a specific position, and then the target product is obtained. However, the substitution reaction is more complex and has many side reactions, which need to be carefully regulated.

Third, propanol is used as the starting material. Propanol can be obtained by the elimination reaction of propene, such as:
\ (CH_ {3} CH_ {2} CH_ {2} OH\ stackrel {concentrated sulfuric acid,\ triangle }{=\!=\!=} CH_ {2} = CH - CH_ {3} + H_ {2} O\)
The subsequent steps are the same as the method of starting with propylene, first adding with chlorine to obtain 3-chloropropylene, and then adding with bromide to obtain 1,2-dibromo-3-chloropropane. < Br >
The method of preparing 1,2-dibromo-3-chloropropane has its advantages and disadvantages, and it needs to be selected according to the actual situation, such as the availability of raw materials, the ease of control of reaction conditions, and the cost.

What are the precautions for storing and transporting 1,2-dibromo-3-fluorobenzene?

1% 2C2-dibromo-3-chloropropane requires attention to many matters during storage and transportation. This is a highly toxic chemical. When storing, it is necessary to find a cool, dry and well-ventilated place, away from fires and heat sources. Because of its great harm to human health and the environment, it is necessary to strictly control the storage temperature and humidity to prevent leakage due to damage to the packaging.

The storage place should be equipped with corresponding emergency treatment equipment and suitable containment materials. It should be stored separately from oxidants, acids, bases, etc., and should not be mixed to prevent dangerous chemical reactions. At the same time, regular inspections of the storage area should be carried out to check for abnormal conditions such as leakage.

When transporting, the relevant regulations on the transportation of hazardous chemicals must be strictly followed. Transportation vehicles must have corresponding safety facilities and warning signs, and drivers and escorts should be professionally trained to be familiar with their dangerous characteristics and emergency treatment methods. During transportation, ensure that the container does not leak, collapse, fall, or damage, and avoid mixing with other items. If there is an accident such as leakage during transportation, emergency measures should be taken immediately to evacuate the surrounding personnel and report to the relevant departments in a timely manner. In short, the storage and transportation of 1% 2C2-dibromo-3-chloropropane must be treated with caution and operated in strict accordance with regulations to ensure the safety of personnel and the environment from pollution.