What are the main uses of 1,2-dibromoethane?
1,2-Dibromoethane, its main uses are as follows:
This substance is often used in organic synthesis and provides key raw materials for the preparation of many fine chemicals. In the field of synthetic medicine, it can be used as an intermediate to participate in the construction of a variety of drug molecules. In the field of pesticide manufacturing, it can help synthesize pesticide ingredients with specific insecticidal and herbicide effects.
In industry, 1,2-dibromoethane is an important raw material for the preparation of important chemical products such as high-purity ethylene and polyethylene. It participates in the reaction, which can optimize the reaction path and improve the purity and yield of the product.
At the same time, 1,2-dibromoethane is also used as a raw material for gasoline seismic additives. In the past, in order to improve the anti-explosion performance of gasoline, it was often added to gasoline. Although its application in gasoline is decreasing due to environmental protection considerations, it is still used in some specific fields.
In addition, in the laboratory, 1,2-dibromoethane is often used in organic chemistry experiments, as an electrophilic reagent to participate in nucleophilic substitution reactions, elimination reactions, etc., to help researchers explore the reaction mechanism and synthesize new compounds.
1,2-dibromoethane plays an indispensable role in many fields such as organic synthesis, industrial production, and laboratory research due to its unique chemical properties.
What are the physical properties of 1,2-dibromoethane?
1% 2C2-dibromoethane, also known as ethylene-dibromide, has the following physical properties:
This substance is a colorless, transparent, volatile liquid at room temperature, and smells sweet like chloroform. Its density is greater than that of water, about 2.17 g/cm ³. It can be miscible with most organic solvents such as ethanol, ether, and chloroform, but it is difficult to dissolve in water. The boiling point is 131.4 ° C, and the melting point is 9.3 ° C. Because of its symmetrical molecular structure, it is a non-polar molecule.
1% 2C2-dibromoethane contains bromine atoms, resulting in an increase in its relative molecular weight and an increase in intermolecular forces. Therefore, the boiling point is significantly higher than that of ethane, and the density is higher than that of water. The characteristics of its non-polar molecules make it well miscible with non-polar organic solvents, but insoluble in polar water. It is colorless and transparent, and has the properties of volatility and special odor. In practical application and operation, attention should be paid to preventing the harm caused by its volatilization.
What are the chemical properties of 1,2-dibromoethane?
1% 2C2-dibromoethane, also known as ethylenedibromine, is an organic compound. Its physical properties are as follows: It is a colorless transparent heavy liquid at room temperature, with a sweet taste, insoluble in water, miscible with organic solvents such as ethanol, ether, and chloroform, and has a higher density than water. The boiling point is 131.4 ° C and the melting point is 9.3 ° C.
Its chemical properties are quite active. From the perspective of substitution reaction, due to the strong electronegativity of bromine atoms and the large polarity of carbon-bromine bonds, the electron cloud density of α-carbon atoms decreases, making them vulnerable to attack by nucleophiles. For example, when heated in an aqueous sodium hydroxide solution, the bromine atom can be replaced by a hydroxyl group to form ethylene glycol; in an alcoholic solution, reacted with sodium cyanide, the bromine atom is replaced by a cyanide group to obtain NC-CH-CH-CN, and this product can be hydrolyzed to obtain succinic acid.
As far as the elimination reaction is concerned, under the action of a strong alkali alcohol solution, 1% 2C2-dibromoethane can undergo the elimination reaction. Taking a potassium hydroxide alcohol solution as an example, when heated, the molecule will remove two molecules of hydrogen bromide to form acetylene gas. This reaction is one of the important methods for preparing acetylene.
In addition, 1% 2C2-dibromoethane can also participate in many organic synthesis reactions and is widely used in the field of organic chemistry. However, it should be noted that it has certain toxicity and carcinogenicity, and protective measures must be taken when using it.
What are the environmental effects of 1,2-dibromoethane?
1% 2C2-dichloroethane, which is an organic halide, has a complex impact on the environment. Here is the ancient saying:
1% 2C2-dichloroethane is volatile, escapes in the atmosphere, or participates in photochemical reactions. In the atmosphere, it can be reacted by photolysis and other reactions to generate active substances such as chlorine-containing radicals. These radicals can interact with atmospheric components such as ozone, which may pose a potential threat to the ozone layer. If the ozone layer is damaged, ultraviolet radiation will increase, which will affect all living things.
In water, 1% 2C2-dichloroethane is insoluble in water, but it has a certain lipid solubility and is easily ingested by aquatic organisms. Accumulated in the body of organisms, transmitted and enriched through the food chain, to high-level organisms, the concentration gradually increases, or the biological physiological function is abnormal, reproduction is blocked, and ecological balance is also impacted. And its degradation in water is slow, long-term retention affects water quality and imbalances water ecosystems.
If the soil is polluted by 1% 2C2-dichloroethane, it can adsorb on soil particles, hinder the normal metabolic activities of microorganisms in the soil, inhibit soil enzyme activities, and then affect the soil nutrient cycle and plant root absorption of nutrients. Plant growth or inhibition, stunted development, and in severe cases, it can cause vegetation wither and death, and damage to regional ecological landscapes and ecological functions.
Furthermore, the risk of 1% 2C2-dichloroethane explosion should not be underestimated. Its steam and air can form explosive mixtures, which can cause combustion and explosion in case of open flames and high heat energy. When an accident occurs, it not only causes casualties, property losses, and the spread of pollutants generated by the explosion, but also makes the surrounding environment worse, causing damage to the atmosphere, soil, and water bodies. It is quite difficult to restore and control.
What are the precautions for storing and transporting 1,2-dibromoethane?
1% 2C2-dibromoethane, when storing and transporting, it is necessary to pay attention to many key matters.
First, this is a toxic chemical that is very harmful to human health. It can invade the human body through the respiratory tract, skin and digestive tract, and damage the central nervous system, liver and kidneys. Therefore, operators must strictly follow safety procedures, wear protective clothing, protective gloves, goggles and gas masks to prevent contact and inhalation.
Second, 1% 2C2-dibromoethane is flammable, and can cause combustion and explosion in case of open flames or hot topics. When storing, when placed in a cool and ventilated warehouse, away from fire and heat sources, the warehouse temperature should not exceed 30 ° C. And it should be stored separately from oxidants, acids, alkalis, etc., and should not be mixed. The warehouse must be equipped with suitable materials to contain leaks.
Third, when transporting, ensure that the container is sealed to prevent leakage. Transportation vehicles should be equipped with the corresponding variety and quantity of fire equipment and leakage emergency treatment equipment. During driving, it should be protected from exposure to the sun, rain, and high temperature. When road transportation, drive according to the specified route, and do not stop in residential areas and densely populated areas.
Fourth, 1% 2C2-dibromoethane is also harmful to the environment and can cause water and soil pollution. In the event of a leak, personnel from the leaked contaminated area should be quickly evacuated to a safe area, and quarantined, strictly restricting access. Emergency responders wear self-contained positive pressure breathing apparatus and anti-toxic clothing. Do not let leaks come into contact with combustible substances, cut off the source of leakage as much as possible, and prevent it from flowing into restricted spaces such as sewers and drainage ditches. If a small amount leaks, absorb it with sand, vermiculite or other inert materials. If there is a large amount of leakage, build an embankment or dig a pit for containment, cover it with foam to reduce steam disasters, and transfer it to a tanker or special collector with an explosion-proof pump for recycling or transportation to a waste treatment site for disposal.