What are the main uses of 2-bromothiophene?

2-% chlorine is the mother liquor made from seawater or lake water and left in the pond. The main components are chlorinated, sulfuric acid, chlorinated and chlorinated, etc., which taste and are toxic. Its main use is wide, and it is involved in engineering, food processing and other fields.

In terms of engineering, it can be used for manufacturing gold. Because it is rich in chlorine, it can be extracted from gold in a series of extraction processes. The gold is high in quality and high in yield. It is widely used in multi-industry such as aerospace and automobile manufacturing, which can effectively reduce the weight of the product and improve its performance.

In the field of food processing, it also plays an important role and is often used as a solidification of tofu. The tofu made in this way has a rich taste and a mellow bean aroma. The principle is that the golden seeds in the bean can agglomerate the protein in the bean into condensation and form tofu. The gypsum maker of this tofu has a more characteristic taste and is deeply loved by the people.



In terms of toxicity, it is not toxic, but it can also be used for certain purposes if it is reasonably treated. It can be used externally to treat skin diseases such as scabies and bites, and has the effect of detoxification. However, it is necessary to be careful when using it. Because of its toxicity, the dosage is easy to cause poisoning.

In other words, 2 - is toxic, but it can be used properly to develop its important value in different fields, which is more beneficial to people's lives.

What are the physical properties of 2-bromothiophene?

The physical properties of the powder are quite special. The color of this agent is often light yellow, and it looks like a light gold color. Although it is not dazzling, it also has its own unique charm. Its shape is powder, delicate and uniform, like the dust of heaven. When you touch it, it is delicate and smooth, without a rough feeling.

As for its smell, it has a slightly pungent smell, but it is not very strong. If you smell it a little bit, you can feel the unique smell in it. If you smell it for too long, you will feel a little uncomfortable. This is also one end of its characteristics.

The density of the powder is slightly heavier than that of ordinary things. When placed in the palm of your hand, you can feel its heavy state. And its solubility also has characteristics. When it dissolves in water, it initially sinks slowly, and then gradually melts. When it melts, there may be a slight heat sensation, and the water temperature rises slightly, but it is not obvious.

Its stability is also considerable. It can survive for a long time at room temperature and does not deteriorate easily. However, if it encounters a hot topic or a strong oxidant, it needs to be treated with caution, because it may have a violent reaction. And because it is in the shape of powder, it is easy to disperse in the air, so when stored, it should be placed in a sealed device to prevent it from escaping, and it needs to be kept away from fire and heat sources. This is the main point of its physical properties, and the user cannot ignore it. When storing and using it, it should be done carefully according to its characteristics, so as to ensure safety.

What are the synthesis methods of 2-bromothiophene?

There are many methods for synthesizing 2-% cyanopyridine, each with its own advantages and disadvantages. The following are common methods:
First, pyridine is used as the starting material and is obtained by two-step reaction of halogenation and cyanidation. First, pyridine and halogen are reacted under suitable conditions to form halogenated pyridine. In this step, a suitable catalyst and reaction temperature are selected to control the reaction check point and rate. Then, halogenated pyridine reacts with cyanide reagents, such as potassium cyanide, etc., in the presence of a phase transfer catalyst, to obtain 2-% cyanopyridine. This path step is simple, but the halogenation reaction selectivity is not good, and by-products are prone to be produced. And the cyanide reagent is highly toxic, so the operation needs to be careful.
Second, 2-methylpyridine is used as raw material and prepared by oxidation and ammonia oxidation. First, 2-methylpyridine is oxidized to 2-picolinecarboxylic acid. The commonly used oxidants are potassium permanganate, potassium dichromate, etc. This process requires precise regulation of the reaction conditions to prevent excessive oxidation. After that, 2-picolinecarboxylic acid is converted to 2-% cyanopyridine under the action of a specific catalyst under the condition of ammonia oxidation. The raw materials of this method are relatively easy to obtain, but the oxidation steps are harsh and require high equipment.
Third, furfural and acetonitrile are used as raw materials and synthesized through a series of reactions of condensation, cyclization and aromatization. Furfural and acetonitrile are condensed under alkali catalysis to form an intermediate product, and then a pyridine ring is gradually constructed by cyclization and aromatization, and a cyanyl group is introduced. The raw materials of this route are green and environmentally friendly, but the reaction steps are complicated, and the total yield may be affected.
Fourth, 2-chloronicotinic acid is used as a raw material to react with ammonia to form 2-aminonicotinic acid, and then 2-% cyanopyridine is obtained by diazotization and cyanidation. The diazotization reaction requires low temperature operation, and the conditions are relatively harsh, and the stability of diazonium salts is not good. Special attention should be paid to safety during operation.

What are the precautions for 2-bromothiophene during storage and transportation?

In the process of storage and recovery, it is necessary to pay attention to the multi-event.

First, in a dry and well-drained place, if it exists in a damp place, it is easy to cause the water content of the solid crushed stone to increase, which affects its mixing ratio, and the quality of the whole product. Second, the height of the stacking material should be reasonably controlled, not high. If the bottom material is not easily damaged, it is not good to use it to break it up, which is unfavorable to the uniformity of construction.

The density of the first weight is high, and the material is covered with tarpaulins, etc., to prevent the material from being exposed to rain or pollution, and to ensure the moisture content of the material. In addition, it is also necessary to control the pressure, and it should not be delayed for a long time until the completion of self-mixing, because the lime-solid crushed stone has a certain initial setting. If it is delayed, the material may be initially set in advance, and it will be mixed normally at the end of the year, which greatly increases the construction speed and also affects the road speed. In addition, the road should be kept flat on the way to avoid severe bumps, in order to prevent material separation and affect the uniformity of the mixing ratio, so as to ensure that the lime-solid crushed stone is not damaged in the storage and process, and lay a good foundation for road construction.

What is the market price range for 2-bromothiophene?

In today's world, the commercial market is ever-changing, and the city of 20% alkali is not always accurate. However, considering the years gone by, and the current state of supply and demand, or the approximate territory can be obtained.

In the past, due to various reasons, such as the abundance of the origin, the good craftsmanship, the traffic congestion, and the number of users, the price of 20% alkali often started from 50 yuan, and ended in 200 yuan. If the place of origin is rich in brine, the method of harvesting is good, and the transportation is smooth, and the market use is not extreme, the price often tends to decline, or nearly 50 yuan. On the contrary, if the source of halogen is harsh, the craftsmanship is perverse, the transshipment is difficult, and the users are numerous, the price will often soar, reaching as high as 200.

Looking at this moment, the land has not changed greatly, and the area where halogen is produced is still said to be stable; the art of making alkali is also rarely changed. However, the world moves, everything changes, and the price of other things may fluctuate, and the way of using alkali may also increase or decrease. If everything is smooth and the supply and demand are evenly balanced, the price should remain in the middle of the past, about 100. If the source of halogen is suddenly difficult, and the demand surges, the price may exceed 200; if the production is widespread and the use is narrow, the price may also fall below 50.

The city of Jia, which covers two percent alkali, really depends on the changes of fate, personnel, supply and demand, and it is difficult to hold one end. Only when you add inspection and study all the feelings in detail can you get its near-real price domain.