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What are the main uses of 3-fluoro-1,2-dimethylbenzene?
3-@-@1,2-dimethylnaphthalene, which is one of the organic compounds. Its main uses are quite extensive, and it plays an important role in both industrial and scientific research fields.
First, in the field of material synthesis, 3-@-@1,2-dimethylnaphthalene is the key raw material. After a specific chemical reaction, high-molecular materials with excellent properties can be obtained. For example, on this basis, through polymerization, polymers with hot topic stability and excellent mechanical properties can be obtained. Such polymers are often used in the aerospace field and are used in the manufacture of aircraft parts. Because they can withstand extreme temperatures and strong external forces, they ensure the safe and stable operation of aircraft.
Second, in the field of fine chemicals, 3--1,2-dimethylnaphthalene can be used to synthesize a variety of high-value-added fine chemicals. Such as special dyes, these dyes have the characteristics of bright color and strong light resistance, and are widely used in the textile printing and dyeing industry to make the fabric color lasting and bright. It can also synthesize specific fragrances. Its unique aroma can add unique charm to perfumes, cosmetics, etc., and enhance product quality and market competitiveness.
Furthermore, in terms of scientific research and exploration, 3--1,2-dimethylnaphthalene is an important model compound for studying the structure and reaction mechanism of organic molecules. By studying various chemical modifications and reactions, researchers gain in-depth insight into the nature and laws of organic chemical reactions, laying a theoretical foundation for the development of new reactions and new synthesis methods, and promoting the continuous development of organic chemistry.
What are the physical properties of 3-fluoro-1,2-dimethylbenzene?
3-Alkane-1,2-dimethylbenzene, also known as o-dimethylbenzene, is a kind of aromatic hydrocarbon. It has the following physical properties:
- ** State and color **: It is a colorless and transparent liquid at room temperature and pressure, and the visual perception is clean and clear, without special color. "Tiangong Kaiwu" said: "The beginning of all colors is born of simple things." This colorless state is also the appearance of its initial simplicity.
- ** Odor **: emits an aromatic smell, but this fragrance is not pleasant, and inhaling too much is harmful to health. The ancients said: "If the fragrance is too much, it is also harmful." Although this smell has the name of fragrance, it needs to be treated with caution.
- ** Boiling point and melting point **: The boiling point is about 144.4 ° C, and the melting point is about -25.2 ° C. The boiling point indicates that it changes from liquid to gas at this temperature, and the melting point indicates the temperature at which it changes from solid to liquid. As Tiangong Kaiwu said: "Everything changes due to temperature." This boiling point and melting point make it behave differently in different temperature environments.
- ** Density **: The density is about 0.88 g/cm ³, which is lighter than water, so if mixed with water, it will float on the water surface. "Light and clear float up, heavy turbidity sinks down." This is a natural principle, and the density characteristics of 3-alkane-1,2-dimethylbenzene also follow this principle.
- ** Solubility **: It is insoluble in water, but it can be miscible with organic solvents such as ethanol, ether, and acetone. "Birds of a feather flock together, and the same kind is compatible." Because its molecular structure is similar to that of organic solvents, it can be miscible with each other, but it is very different from that of water, so it is insoluble.
- ** Volatility **: It has a certain degree of volatility and will gradually evaporate in the air. "The dissipation of gas is like the disappearance of fog." Its volatilization characteristics make it difficult to survive in the air for a long time.
Is the chemical property of 3-fluoro-1,2-dimethylbenzene stable?
The chemical properties of 3-hydroxyl-1,2-dimethylbenzene are quite stable. In this compound, the structure of the benzene ring gives it a certain stability. The benzene ring has a conjugated large π bond, and the electron cloud is uniformly distributed, which reduces the molecular energy and tends to be stable.
Although its hydroxyl group (-OH) has a certain activity and can participate in reactions such as esterification, its activity is slightly lower than that of ordinary alcohol hydroxyl groups due to the influence of the benzene ring and ortho-methyl group. Methyl (-CH 🥰) is connected to the benzene ring and acts as a power supply, which can increase the electron cloud density of the benzene ring and enhance the stability of the benzene ring.
Under common conditions, 3-hydroxyl-1,2-dimethylbenzene is not easy to react violently with many common reagents. For example, at room temperature and pressure, it does not react significantly with water, general neutral salt solutions, etc. Even in the case of mild oxidizing agents, it is difficult to oxidize without a special catalyst.
However, its stability is not absolute. Under specific conditions, such as high temperature, strong acid, strong base or specific catalyst, chemical reactions can still occur. For example, under strong acid catalysis and heating conditions, hydroxyl groups can be esterified with acids; benzene rings may undergo oxidation and ring opening reactions under the action of suitable catalysts and strong oxidizing agents. But overall, 3-hydroxy- 1,2-dimethylbenzene exhibited high chemical stability under normal environmental and chemical operating conditions.
What is the preparation method of 3-fluoro-1,2-dimethylbenzene?
To prepare 3-Ming-1,2-dimethylnaphthalene, the following method can be used.
Naphthalene is first taken as the base, and the naphthalene has the structure of conjugated dicyclic aromatic hydrocarbons. The desired group can be introduced by electrophilic substitution reaction under appropriate conditions.
Using anhydrous aluminum trichloride as a catalyst, an appropriate amount of halogenated hydrocarbons (such as 1-chloro-2-methylpropane) and naphthalene are co-placed in an inert organic solvent (such as carbon disulfide) in a low temperature environment (such as 0-5 ° C). Anhydrous aluminum trichloride can interact with halogenated hydrocarbons to generate carbocation, which is electrophilic and can attack the naphthalene ring. Due to the high electron cloud density at the α position of the naphthalene ring, the carbocation preferentially attacks the α position of the naphthalene ring to obtain 1 - (2 - methylpropyl) naphthalene.
Then, the 1 - (2 - methylpropyl) naphthalene is oxidized with an appropriate oxidizing agent (such as the basic solution of potassium permanganate). During the oxidation process, the side chain is affected by the benzene ring, and the hydrogen on the α-carbon is easily oxidized, eventually transforming the side chain into a carboxyl group to obtain 1-carboxyl-2
Then 1-carboxyl-2-methylnaphthalene is co-heated with alkali lime to carry out decarboxylation reaction. Carboxyl groups can remove carbon dioxide under the action of alkali lime to obtain 2-methylnaphthalene.
For 2-methylnaphthalene, anhydrous aluminum trichloride is used again as a catalyst, at a suitable temperature (such as 40-60 ° C) and in the presence of suitable halogenated hydrocarbons (such as chloromethane), the methyl group is introduced at 1 position of 2-methylnaphthalene through electrophilic substitution reaction, and finally 3-ping- 1,2-dimethylnaphthalene is obtained. This process requires fine temperature control and quantity control, and the reagents used must be pure, and the operation should be rigorous in order to obtain high-yield products.
What are the precautions for storing and transporting 3-fluoro-1,2-dimethylbenzene?
3-Bromo-1,2-dimethylbenzene should pay attention to the following things during storage and transportation:
First, when storing, a cool and ventilated warehouse must be selected. This is because it is flammable, high temperature or dangerous. The temperature of the warehouse should be controlled within a reasonable range to prevent it from evaporating and intensifying due to excessive temperature, or causing other safety hazards. Keep away from fire and heat sources. Any open flame or high temperature source may ignite this chemical, causing fire or even explosion.
Second, it should be stored separately with oxidants and food chemicals. Oxidants are highly oxidizing and contact with 3-bromo-1,2-dimethylbenzene can easily trigger chemical reactions, or cause combustion and explosion. And mixed with edible chemicals, once leaked, it is very likely to contaminate food and endanger human health.
Third, when transporting, make sure that the container does not leak, collapse, fall, or damage. Because it is a liquid chemical, it is easy to evaporate and spread after leakage, which not only pollutes the environment, but also increases the risk of fire and explosion. Transportation vehicles should be equipped with corresponding varieties and quantities of fire fighting equipment and leakage emergency treatment equipment for emergencies. If there is an accident such as leakage on the way, it can be responded to in time to reduce the harm.
Fourth, during transportation, it should be protected from exposure to the sun, rain, and high temperature. Exposure and high temperature will accelerate the evaporation of chemicals, increase the pressure in the container, and cause leakage or explosion. Rain exposure may cause chemicals to react with water, or spread with rain, polluting the surrounding environment.
Fifth, road transportation should follow the specified route and do not stop in residential areas and densely populated areas. This is to avoid serious harm to many residents in the event of an accident and minimize the impact on public safety and the environment.
