Pyridine, 3-bromo-2-nitro-

This product has three boils and two tillers, and its properties are pure.
Its chemical properties are stable. In ordinary temperature and pressure environments, it is not easy to react violently with other things. It is like a humble gentleman, who is noisy and calm, and keeps the truth without moving. This stability makes the product do not need too harsh conditions during storage and transportation, as if it can calmly cope with the bumps of the journey and the passage of time.
It also has good solubility. In many common solvents, it can be moderately dissolved, just like ice and snow in warm spring, which naturally melts. This property allows it to play a key role in the preparation of various solutions and the preparation of delicate pharmaceuticals, helping the blender to achieve accurate proportions, such as craftsmen carving beautiful jade, and pinching it just right.
Furthermore, its pH is neutral. Unbiased, neutral and peaceful, neither corrosive to acid nor irritating to alkali. Just like a wise man in life, he treats people with the way of neutralization, so he can coexist harmoniously with a variety of substances. It is widely used in many fields that require strict pH, and plays a balanced and stable role in it, maintaining the harmony of the environment and promoting smooth reactions.
Its redox properties are also unique. Under specific conditions, it can moderately demonstrate the ability of oxidation or reduction, just like mastering the method of yin and yang changes, and timely change according to the situation. This property, in the catalysis of many chemical reactions and the transformation of substances, is like a driving force behind the scenes, silently playing a role in promoting the reaction in the expected direction, providing indispensable assistance for various production processes and scientific research.

The main uses of 3-2-naphthalene-based dyes are:
as raw materials for primary dyes. Naphthalene-based compounds can be used to reverse-transform various color groups to synthesize colorful dyes, which are used for printing and dyeing, so that the cloth is colorful. For example, some naphthalene-based azo dyes have good color fastness and color fastness, and are deeply favored by the world.
important in the synthesis of secondary dyes. Its special compounds can be modified and derived, and compounds with specific physical activities can be used. Some naphthalene derivatives can be used in the study of pain and anti-inflammatory substances. By acting on specific human receptors or enzymes, they can be used for physiological reactions and the purpose of treating diseases.
Furthermore, it is also useful in the field. With naphthalene-based core, it has the functions of herbicide and weeding. For example, some naphthalene-based herbicides can inhibit the growth of specific herbicides, ensure the normal growth of crops, and improve the production capacity.
In addition, in the field of synthetic materials, high-performance grease, plastics, etc. can be synthesized. Naphthalene-based modified materials often have excellent physical properties, such as higher performance and resistance, and are used in high-end products such as aerospace and automobile manufacturing to improve the performance of materials.

There are many methods for the synthesis of 3-bromo-2-furanoic acid, each with its own advantages. The following common ones are described in detail:
###Using furan as the starting material
1. ** Bromination reaction **: Furan and bromine are reacted in a suitable solvent, such as dichloromethane, in a low temperature environment. Bromine will selectively be substituted at specific positions in the furan ring to produce 3-bromofuran. This reaction requires attention to the reaction temperature and the amount of bromine to prevent excessive bromination.
2. ** Carboxylation reaction **: The obtained 3-bromofuran is first prepared into the corresponding organometallic intermediate with carbon dioxide under the action of a suitable catalyst, such as magnesium reagent (Grignard reagent method), and then hydrolyzed to obtain 3-bromo-2-furanic acid. In this process, the preparation of Grignard reagent requires an anhydrous and oxygen-free environment to ensure the smooth progress of the reaction.
###Using 2-furanic acid as raw material
1. ** Bromination reaction **: 2-furanic acid In the presence of an appropriate catalyst, such as iron powder or iron tribromide, an electrophilic substitution reaction occurs with bromine. Since the carboxyl group is the meta-localization group, the bromine atom will be mainly substituted at the 3-position, thereby obtaining the target product 3-bromo-2-furanic acid. This reaction should control the amount of catalyst and reaction temperature to avoid side reactions.
###Other methods
1. ** Conversion through furan derivatives **: Some furan derivatives containing suitable substituents can also be prepared by a series of functional group conversion reactions. For example, some furan compounds with groups that can be converted into bromine atoms and carboxyl groups can gradually achieve the construction of the target molecule through specific chemical reaction steps. This approach requires careful design of the reaction route according to the characteristics of the starting material, and precise control of the reaction conditions at each step.

There are many things that need to be paid attention to in the process of hiding.

In the process of hiding, the dryness and dryness of the first environment. If the environment is wet, it is easy to rot, causing it to be damaged in the ground. This place is like a good place to hide in the ground, and the blade is easy to grow, and the light will no longer be lost after a long time. Therefore, it is appropriate to be in a place with high dryness and pass through, to avoid the invasion of water.
The next time it is suitable for the degree. The degree is low, or it is cold and cold, and cracks are generated. For example, if a cold night suddenly meets a warm day, the ice will melt quickly, which is easy to cause rupture. Therefore, it is necessary to prevent it from being damaged in a place where there is a difference.
Furthermore, the stacking method is good. If it is not stacked, it is easy to make the stacks collide with each other and cause damage. < b Such as walking on the road, order is not easy to cause collisions. It is orderly and orderly, and the order is distinct, so as to keep it solid.
It is difficult to travel on the road. The road is rough and bumpy, making it difficult to shake and strong, and easy to produce. Just like a boat traveling on a wave, it is easy to overturn the ship. Therefore, the road is smooth, or there are things in the equipment, so it is easy to shake.
Those who send it must be careful. They need to know the treasures of the road, and be extra careful on the road. If people are negligent, it is easy to cause things to be lost if they are not noticed by guardians.
The package should not be ignored. It should be wrapped with solid and soft materials. It is not only to prevent external forces, but also to shock. Only in this way can the three-year-old and the two-year-old millet be protected, and they will be safe and ill in the hidden warehouse.

There is a market price range for 3-hydroxyl-2-furanyl today. Roughly speaking, it varies depending on factors such as quality, origin, supply and demand.
In the general market, if it is of ordinary quality, the price per unit is about tens to one or two hundred dollars. If it is of good quality, comes from a good place, and the market demand is strong, its price may rise to three or four hundred dollars, or even higher.
However, if there is an oversupply in the market and the demand is weak, even if the quality is still good, the price may fall below tens of dollars.
Or in different regions, the price also varies. In prosperous cities, there is a lot of demand, and the price may be high; in remote places, the transaction is sparse, and the price may be slightly lower.
In short, the market price of 3-hydroxy- 2-furanyl often fluctuates between tens of dollars and hundreds of dollars. It is difficult to determine an exact number, depending on the specific circumstances at that time.