2-Thiazolecarboxaldehyde, 4-bromo-

The 4-%-2-carapace is a material property, which is special and rich, and can also be followed in ancient books.
Its taste is thick and thick, and it has the fragrance of the ingredients. In the process of cooking, the general spice is added to the texture of the nail, so that the taste of the meat is mellow, and the flavor of the meat is mellow and will not dissipate for a long time.
Its nature, a cold thing, but the method of 4-%-2-carapace, the cold is a little bit. In the middle, the carapace has the effect of nourishing and clearing the blood. This cooking, its beneficial nature may be easier for people to suffer.
Furthermore, this cuisine also has its own characteristics. The meat of the nail, the process of the nail, is soft without losing the quality. The skirt of the nail is already rich, and the cooking is even more smooth and tender, and the feeling of melting in the mouth is evocative. The meat is tender and tender, the chewing is hard, the meat is dense, and the taste is hard to release.
And its fragrance is integrated with the fragrance of the nail's own fragrance and materials. The fragrance of star anise, cinnamon, pepper and other spices, the flavor of the nail is mixed, forming a special fragrance, which can attract people to eat. In addition, 4-% methylbenzene, its taste, sex, flavor, and fragrance are all unique, and it is the best among them.

4-N-2-pentanone methyl ether, also known as acetylacetonate methyl ether, is an important organic compound. Its physical properties are as follows:
1. ** Properties **: At room temperature and pressure, it is mostly a colorless and transparent liquid, with a clear appearance and no foreign matter.
2. ** Odor **: It has a special odor. Its taste is different from the common alcohol and ether odors. It is slightly unique, but it is not pungent and unpleasant, and ordinary people can tolerate it.
3. ** Boiling Point **: The boiling point value is within a specific range. At a certain temperature, the substance changes from liquid to gaseous state. This boiling point characteristic is crucial for temperature control of separation, purification and related chemical reactions. If the temperature is properly controlled, it can be precisely separated from the mixture by distillation.
4. ** Melting point **: The value of the melting point is clear. Under specific low temperature conditions, the substance solidifies from liquid to solid. This characteristic needs to be taken into account during storage and transportation to avoid solidification due to low temperature, which will affect subsequent use.
5. ** Solubility **: In organic solvents, it shows good solubility. Common organic solvents such as ethanol and ether can be mutually soluble with it. However, the solubility in water is relatively limited, and this solubility difference is widely used in the fields of extraction and construction of reaction systems. According to this, organic solvents can be used to effectively extract and separate them from water-containing systems.
6. ** Density **: Density is also one of its important physical properties. Compared with water, it has a specific density value. This density characteristic, in the mixed system, can affect the stratification of substances and provide a basis for separation operations.

4-Bromo-2-nitrobenzoic acid is an important intermediate in organic synthesis. The common synthesis methods are as follows:
** Benzoic acid is used as the starting material **:
Benzoic acid is first introduced into the nitro group through nitration reaction. The benzoic acid is dissolved in an appropriate amount of mixed acid (a mixture of concentrated sulfuric acid and concentrated nitric acid) and reacted at a suitable temperature. This process requires strict temperature control. Excessive temperature may lead to the formation of polynitro substitution products. After the reaction is completed, 2-nitrobenzoic acid is obtained by cooling, dilution, filtration, etc. Next, the bromination reaction of 2-nitrobenzoic acid with bromine is carried out under the action of a catalyst (such as iron powder or iron tribromide). The reaction is carried out in an appropriate organic solvent (such as carbon tetrachloride). Bromine and 2-nitrobenzoic acid are catalyzed by a catalyst. Bromine atoms replace hydrogen atoms at specific positions on the benzene ring to obtain 4-bromo-2-nitrobenzoic acid. After the reaction is completed, the product is purified by distillation, recrystallization and other methods.
** Using toluene as the starting material **:
Toluene is first brominated. In the presence of light or an initiator, toluene undergoes a free radical substitution reaction with bromine, which mainly generates benzyl bromide. Then, benzyl bromide is hydrolyzed to benzyl alcohol under alkaline conditions, and then oxidized to obtain benzoic acid. The subsequent steps are similar to the subsequent steps with benzoic acid as the starting material, that is, nitration first and then bromination, so as to obtain the target product 4-bromo-2-nitrobenzoic acid. This route has relatively many steps, but toluene has a wide range of sources and low cost, and has certain applications in industrial production.
** Using o-nitrotoluene as the starting material **:
o-nitrotoluene Under the action of brominating reagents (such as N-bromosuccinimide, NBS) and initiators, a free radical bromination reaction occurs, and bromine atoms can be introduced at the ortho-para-position of methyl. Since nitro is the meta-locator, the main product is 4-bromo-2-nitrotoluene. Subsequently, 4-bromo-2-nitrotoluene is oxidized, and the commonly used oxidant such as acidic potassium permanganate solution oxidizes methyl to carboxyl group to obtain 4-bromo-2-nitrobenzoic acid. The starting material of this method is relatively special, but the steps are relatively simple. If o-nitrotoluene is easy to obtain, it can be regarded as an effective synthetic route.

4-1-2-pentanolamine, also acetylacetonolamine, is useful in many domains.
In the context of synthesis, it can be used as an important medium. Due to the specific activity of the compound, it can be used for many reactions, helping researchers to build new molecules. For example, in the synthesis of some antibacterial and antiviral compounds, 4-2-pentanolamine can be used for specific reactions, introducing new functionalities and giving new physical and biological activities.
In the field of materials, it also exhibits extraordinary value. In the synthesis of polymer materials, it can be modified. Its addition can change the physical properties of polymer materials, such as improving the mechanical properties of materials, qualitative and so on. Taking a certain engineering plastic as an example, the amount of 4-2-pentanone amine and the copolymerization and reversal can improve the resistance and resistance of the material, and expand its application in high-cost and high-cost environments.
In the catalytic field, 4-1-2-pentanone amines can be used to build new catalytic systems. Because of its ability to coordinate gold molecules to form complexes, this complex often exhibits high catalytic activity. In some synthetic reactions, such as the formylation reaction of alkenes, the catalytic reaction of gold complexes with this compound can be efficiently catalyzed, and the chemical reaction of the compound can be precisely controlled, which greatly improves the reaction efficiency.

4-2-1-1-1-1-1-1-1-1-1-1-2-1-2-1-2-1-2-2-1-2-1-1-1-1-1-1-1-1-2-1-1-2-1-1-1-1-1-1-1-1-1-1-2-1-1-1-1-1-1-1-2-2-1-1-1-1-1-1-2-1-1-2-2-1-1-1-1-1-2-2-1-1-1-1-2-2-2-1-1-1-1-2-1-2-2-2-1-1-1-2-2-1-2-2-1-1-2-2-1-2-2-2-2-2-1-2-2-1-2-1-2-2-1-1-1-1-2-2-1-2-2-1-2-1 If the demand for related substances in the global market surges, the demand for methamphetamine will also increase, and the price may increase; on the contrary, if the demand is low, the price will not decline.
Third, the policy method cannot be ignored. Methamphetamine is subject to the control of the price. The policy is integrated, such as the increase of the batch of raw materials, the increase of circulation management, etc., may increase the cost of production, which will promote the increase of the price.
Based on the above factors, the price of 4-2% methamphetamine is determined by the price. Roughly speaking, its price per gram may range from 10 yuan to 100 yuan. However, this is a rough estimate, and the price depends on the situation of the market. In the city, its price is also engraved in the market.