What are the main uses of 2-bromothiazole?

2-% of the wine, its use is very important. In the study of ancient books, its main uses have the following ends.

First, it can be used for transportation. In ancient times, there were many people who used alcohol to treat diseases. "Materia Medica": "Wine is strong in nature, can dissipate and dissipate, and it is like a powder." Therefore, in the case of agglomeration diseases, alcohol can dissipate it and make it dissolve. And it has the effect of dryness, which can be used for diseases invaded by evil, such as arthralgia. If the evil remains, the wine can dry it and solve the pain through it.

Second, it is also useful in the food of the people. In the food industry, wine is often used as a flavor. Its fragrant taste can improve the taste of dishes and make the food taste better. For example, when cooking, dripping wine can remove the fishy smell and increase its beautiful taste. And in the case of cooking, adding wine can help the ingredients to be incorporated into the ingredients, making the food taste special and more resistant to hiding.

Furthermore, in the field of industrial production, wine is also indispensable. In some manual techniques, such as dyeing, wine can be used to fix color. For dyeing, adding an amount of wine can make the dyes and materials more dense, the dyeing is uniform, and it is not easy to fade, and the color of the food is maintained for a long time. In addition to leather production, wine can help leather soften, prevent leather from rotting, increase the durability of leather, and make it more suitable for making various leather goods.

Of course, 2-% alcohol is used, which involves diseases, food and taste, and down to industrial production. It plays an important role in many aspects of the ancient people's life. It is also a multi-purpose good product.

What are the synthesis methods of 2-bromothiazole?

2-% fenvalerate is a commonly used insecticide. There are many methods for its synthesis. This imitation of "Tiangong Kaiwu" is recorded in the ancient text as follows:

To make 2-% fenvalerate, the first thing to do is to prepare the corresponding raw materials. One is m-phenoxybenzaldehyde, and the other is cyanovaleric acid. These two are the key substances in the synthesis.

Preparation of m-phenoxybenzaldehyde can be done by phenoxylation. Take phenol and m-chlorobenzaldehyde as the starting material, and combine them under the catalysis of alkali. Bases such as sodium hydroxide can promote the reaction. During the reaction, the temperature needs to be controlled in an appropriate range, usually in a moderate warm environment, about ten degrees Celsius. Under these conditions, the hydroxyl group of phenol interacts with the chlorine atom of m-chlorobenzaldehyde to remove hydrogen chloride, and then m-phenoxy benzaldehyde is obtained.

The preparation of cyanovaleric acid can be made from isopentenol and sodium cyanide. First, the isopentenol interacts with a halogenating agent and halides it to produce halogenated isopentenol. Halogenated isopentenol and sodium cyanide undergo nucleophilic substitution reaction, and the cyanyl group replaces the halogen atom to obtain cyanoisopentenol. After hydrolysis and other series of reactions, it is converted into cyanovaleric acid.

When both m-phenoxybenzaldehyde and fenvaleric acid are prepared, the condensation reaction is carried out in the presence of a suitable catalyst. The catalyst can be selected from a specific organic base or metal salt. The reaction is carried out in a solvent, such as toluene, to facilitate the mixing and uniformity of the material. When condensing, attention should also be paid to the regulation of temperature and reaction time. Through this condensation reaction, the aldehyde group of m-phenoxybenzaldehyde interacts with the carboxyl group of fenvaleric acid and other groups to finally synthesize 2-% fenvalerate. The whole synthesis process requires fine control of the conditions of each link in order to obtain a product with higher yield and purity.

What are the physical properties of 2-bromothiazole?

2-% fenvalerate is an organophosphorus insecticide with unique physical properties. Looking at its form, at room temperature, it is often colorless to light yellow viscous liquid, with clear color, uniform texture, and no impurities visible to the naked eye.

When it comes to odor, this agent has a weak special smell. Although it is not pungent and intolerable, it is also unique, which can be used for preliminary identification.

Its melting point is also fixed, the melting point is about 50.7 ° C, and the boiling point is 222 ° C/66.7Pa. This characteristic determines its physical state under different temperature environments, and has a great impact on its storage and use.

In terms of solubility, 2-% fenvalerate is insoluble in water, and its solubility in water is extremely low. However, it exhibits good solubility in organic solvents, such as acetone, acetonitrile, chloroform, cyclohexanone, dichloromethane, methanol, toluene and other organic solvents, which can be mutually soluble with it. This solubility property is of great significance in the preparation, dilution and practical application of pharmaceuticals, and can make it better dispersed in specific media to achieve the best insecticidal effect.

In addition, the density of 2-% fenvalerate is about 1.17 (20 ° C), and the relative density is moderate, which affects its distribution and adhesion in the preparation and spraying process to a certain extent. And its stability is acceptable. Under normal storage conditions, it can maintain a relatively stable chemical structure and physical state to ensure long-lasting efficacy. However, under extreme conditions such as high temperature, strong acid and alkali, reactions such as decomposition may also occur, which affects its effectiveness.

What are the chemical properties of 2-bromothiazole?

2-% pentalose, one of the carbohydrates, has specific chemical properties. Its molecule contains five carbon atoms and one aldehyde group, which is very important in the field of organic chemistry and biochemistry. The following chemical properties are briefly described:
1. ** Oxidation reaction **: pentalose contains aldehyde groups and has strong reducing properties. It can be oxidized by weak oxidants, such as Torun reagent (silver ammonia solution), to form a silver mirror, which is a typical reaction of aldehyde groups. It can also be oxidized by Feilin reagent to produce a brick-red precipitate. Under the action of strong oxidants, aldehyde groups can be further oxidized to carboxyl groups to form pentanoic acid.
2. ** Reduction reaction **: aldehyde groups can be reduced to alcohol hydroxyl groups. Treating pentalose with a reducing agent such as sodium borohydride, the aldehyde group will be converted into a hydroxymethyl group to form a pentanol.
3. ** Astane-forming reaction **: pentalose interacts with phenylhydrazine to form an alkyl sugar. The aldehyde group first reacts with phenylhydrazine to form a phenylhydrazone. Due to the influence of phenylhydrazine, the activity of hydroxyl groups on adjacent carbon atoms is enhanced, and it will continue to react with phenylhydrazine, and finally form a sugar with a specific crystal form and melting point. The crystal forms and melting points of the sugar produced by different pentalogans are different, which can be used for the identification of pentalogans.
4. ** Astanogenation reaction **: The hemiacetal hydroxyl group in the pentalose molecule can The bond between the sugar and the non-sugar part in the glycoside is called the glycosidic bond. The glycoside reaction changes the chemical properties of the sugar, such as the glycoside is no longer reductive.
5. ** Isomerization reaction **: Under alkaline conditions, valerose can be isomerized. After the formation of the enediol intermediate, it can be converted through different pathways to generate aldose or ketose isomers. This isomerization reaction is of great significance in the process of sugar metabolism in organisms, providing the possibility for the mutual conversion and utilization of sugars.

What is the price range of 2-bromothiazole in the market?

In today's city, there are differences in the quality of two kinds of agarwood, depending on the quality, location, and supply and demand.

The high-quality Hainan second-grade agarwood, its fragrance is quiet and unique, and its taste is rare, and it is rare in the city. The price of each catty may be the giant of gold. This is because of its thick production environment, coupled with the heavy moon, the mellow fragrance is sought after by many collectors and incense users.

The medium-sized Vietnamese second-grade agarwood also has a similar fragrance, and its fragrance is slightly inferior to Hainan agarwood. However, its quantity is relatively large, and the size of each catty in the city ranges from 1,000 to 10 gold. This agarwood is also widely used in the fields of incense, use, etc.

As for other ordinary agarwood, the taste is slightly different, and its price is per catty or 100 gold. This agarwood is not as fragrant as the previous two, but it can also meet the needs of general incense, such as daily incense.

There are also artificial agarwood plants, which have a short growth cycle and a poor fragrance compared with natural agarwood. Its price is low, and the second agarwood is per catty or not.

In other words, the second agarwood is in the market, ranging from 100 gold to 100 gold. Those who need to check its product, source and other factors can get the fragrance of the heart.