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What are the physical properties of 1-bromo-3-fluoro-2-methylbenzene?
1 + - -3 + -Yang-2 + -methylnaphthalene is a kind of organic compound. Its physical properties are as follows:
Looking at its properties, under normal temperature and pressure, it is mostly colorless or slightly yellow oily liquid, and its flowing state can be visually recognized, or shimmering under light.
The smell of smell has a unique aromatic charm, but this smell may vary slightly depending on the environment and concentration.
As for the melting point, the melting point is about -22 ° C, and the boiling point is about 241.1 ° C. At the melting point, the solid and liquid states may change; at the boiling point, the liquid turns into a gaseous state and rises.
When it comes to density, it is about 1.025g/cm ³, which is slightly heavier than water. If it is co-located with water, it can be observed that it sinks underwater.
In terms of solubility, it is difficult to dissolve in water, because water is a polar solvent, and 1 + --3 + -yang-2 + -methylnaphthalene is a non-polar organic substance. According to the principle of "similar miscibility", it is insoluble in water. However, it can be soluble in many organic solvents, such as ethanol, ether, benzene, etc., and can be uniformly dispersed in such solvents to form a uniform system. In terms of volatility, although it is not a highly volatile substance, under appropriate temperature and ventilation conditions, some molecules will escape the liquid surface and spread in the surrounding space.
What are the chemical properties of 1-bromo-3-fluoro-2-methylbenzene?
1 + -Bifurcation-3 + -Jiang-2 + -methylnaphthalene, this is an organic compound. Its chemical properties are rich and diverse, let me talk about them one by one.
First, it has the typical properties of aromatics. Methylnaphthalene contains a naphthalene ring structure and is a member of the aromatic hydrocarbon family. Under appropriate conditions, electrophilic substitution reactions can occur. For example, in the case of halogenated reagents, such as bromine catalyzed by iron bromide, bromine atoms will replace hydrogen atoms on the naphthalene ring to form brominated methylnaphthalene. This is due to the high electron cloud density of the naphthalene ring, which is highly attractive to electrophilic reagents.
Furthermore, the Methyl group acts as the power supply group, which can further increase the electron cloud density on the naphthalene ring connected to it, making the region more prone to electrophilic substitution, and the localization effect is significant, so that the substitution reaction mainly occurs at a specific location. At the same time, methyl group can be oxidized. Under the action of strong oxidants such as acidic potassium permanganate, methyl group can be oxidized to carboxyl group, thereby generating naphthalene derivatives containing carboxyl groups.
In addition, methyl naphthalene can participate in the addition reaction. The naphthalene ring is unsaturated and can undergo addition reaction with addition reagents such as hydrogen under specific catalysts and reaction conditions. When partially hydrogenated, some double bonds in the naphthalene ring can be reduced to form products with different hydrogenation degrees. The structure of the product is closely related to the reaction Due to its unique chemical properties, methylnaphthalene has important uses in many fields such as organic synthesis and materials science. It can be used as a raw material to synthesize a variety of fine chemicals and functional materials.
In what fields is 1-bromo-3-fluoro-2-methylbenzene used?
1 + -Hg-3 + -arsenic-2 + -methylmercury is a highly toxic substance, which is harmful in many fields and rarely beneficial.
Mercury and its compounds were widely used in industry, agriculture, medicine, etc. In industry, mercury electrodes used in the chlor-alkali industry in the past were mostly abandoned today due to their serious pollution; in medicine, there were also mercury-containing drugs in the past, but they were no longer used due to toxicity problems.
Arsenic was often used to make poisons in ancient times, but in modern times, a small amount of arsenic compounds have certain applications in some special alloy manufacturing and semiconductor materials, but their toxicity is extremely high, and it is easy to cause environmental pollution and human harm.
Methylmercury, as an organic mercury compound, is more toxic and is mostly converted from inorganic mercury under the action of environmental microorganisms. It mainly exists in aquatic ecosystems and is enriched through the food chain, eventually endangering human health, such as Minamata disease, which has caused. Methylmercury has basically no positive applications in the environment and human health, but more brings serious ecological disasters and health threats. We should make every effort to avoid its generation and spread, and maintain the ecological environment and personal safety.
What is the synthesis of 1-bromo-3-fluoro-2-methylbenzene?
To prepare 1-bromo-3-ene-2-methylbenzene, the following method can be followed.
First take toluene, use a mixed acid of concentrated sulfuric acid and concentrated nitric acid, and nitrate it at a suitable temperature. The methyl group of toluene is an ortho-para-site group, and p-nitrotoluene can be obtained in this step. Due to the electron-giving effect of methyl, the electron cloud density of the benzene ring is increased, and the nitro group is easy to attack the para-site.
After obtaining p-nitrotoluene, iron powder and hydrochloric acid are used as reducing agents to reduce the nitro group to an amino group to form p-aminotoluene. This reduction reaction can convert the nitro group to an amino group.
Then the p-aminotoluene is reacted with bromine water. The amino group is a strong ortho-ortho-localization group, and the ortho-site steric barrier is small. Bromine preferentially replaces the amino-ortho-site to obtain 2-bromo-4-aminotoluene.
Subsequently, the diazotization reaction is used to treat 2-bromo-4-aminotoluene with sodium nitrite and hydrochloric acid at low temperature to convert the amino group into a diazo salt. The diazo salt is active and can interact with hypophosphoric acid. The diazo group is replaced by hydrogen to obtain 2-bromo-toluene.
Next, the 2-bromo-toluene is reacted. Palladium-catalyzed coupling reaction can be used, such as carbon-carbon bond coupling with alkenyl borate under basic conditions and palladium catalyst, and alkenyl groups are introduced to prepare 1-bromo-3-ene-2-methyl benzene. This palladium-catalyzed coupling reaction has the characteristics of high efficiency and good selectivity, and can accurately construct the required carbon-carbon bond. In this way, the synthesis target can be achieved through multi-step reaction.
What is the approximate market price of 1-bromo-3-fluoro-2-methylbenzene?
"1+-+%E6%BA%B4+-+3+-+%E6%B0%9F+-+2+-+%E7%94%B2%E5%9F%BA%E8%8B%AF%E7%9A%84%E5%B8%82%E5%9C%BA%E4%BB%B7%E6%A0%BC", if you want to know its approximate price, but the things involved are obscure and need to be studied in detail.
Among them, "% E6% BA% B4", or the code of "mercury", mercury, chemical elements are also liquid metals at room temperature, which are widely used in many fields such as chemical industry and instrumentation. "% E6% B0% 9F", or "oil". There are many types of oil, including oil, vegetable oil, etc. Oil is an important energy and chemical raw material in the world today. Its price is affected by many factors such as geopolitics, supply and demand relations; vegetable oil also varies in price depending on the type and quality. " %E7%94%B2%E5%9F%BA%E8%8B%AF ", or a specific organic matter, organic compounds play a key role in the chemical industry, and their prices are often closely related to raw material costs and production processes.
However, based on" 1+-+%E6%BA%B4+-+3+-+%E6%B0%9F+-+2+-+%E7%94%B2%E5%9F%BA%E8%8B%AF "alone, it is difficult to accurately determine its market price. If" mercury ", its price often fluctuates due to purity and market demand. Recently, the price of pure mercury ranges from hundreds to thousands of yuan per kilogram. Oil prices, the international crude oil market is changing rapidly, and each barrel often fluctuates from tens of dollars to hundreds of dollars. Converted to unit quality, there are also large differences. As for" 2-methylnaphthalene ", its market price also depends on purity, supply and demand conditions, and may range from thousands to tens of thousands of yuan per ton.
First of all, because the information given is not clear about the specific specifications and market space-time background of each item, it can only be said roughly, and it is difficult to determine the specific market price.