5-Chlorothiophene-2-carbonyl chloride

Borax, also known as borax and basin sand, is the crystallization of mineral borax refined. It is widely used in ancient prescriptions and has many uses.
For physicians, borax has the effect of clearing away heat and detoxifying, and is often an important medicine for external use to treat sore throat and mouth sores. As the "Compendium of Materia Medica" says: "Borax, sweet in taste, slightly salty, cold in nature, and non-toxic. Treat scorched phlegm and heat, generate body fluid, remove breath, eliminate obstruction, remove diaphragm and nausea, build-up and bruise, yin broken bone choking, acne and mouth and teeth diseases." When used externally, it is mostly made into a powder, which can be applied directly to the affected area, so that the medicinal power can be directly applied to the sick place, so as to clear away heat and reduce swelling, converge sores and relieve pain.
In the art of alchemy, borax is also wonderfully useful. It can be used as an auxiliary to participate in the refining of medicinal pills. In some pill formulas, borax helps to adjust the properties of medicines, promote the fusion of various medicines, make the refining of medicinal pills more smooth, and achieve the desired efficacy and quality.
In the process of making, the effect of borax cannot be ignored. For example, in the field of ancient metallurgy, borax can be used as a flux. "Tiangong Kaiwu" states: "Where the method of soldering iron is used, there is a strange medicine in the Western countries. China uses white copper powder for small welding, and large welding tries its best to swing the hammer and force it together. After a long time, it will never be firm. Therefore, there are those who forge the western side of the cannon, but China only works in casting." Although this does not directly describe the melting of borax in metallurgy, in actual metallurgical operations, borax can reduce the melting point of metals, help separate metal impurities, improve metal purity and quality, and optimize metal processing performance. In addition, in ceramic and glass production processes, borax can adjust the melting point and viscosity of glaze and glass, improve its fluidity and gloss, and make finished products more exquisite.
Borax has important uses in many fields in ancient times. Whether it is medical treatment, alchemy, or process production, it plays a unique role, bringing many conveniences and improvements to the lives and production of the ancients.

"Tiangong Kaiwu" has a saying: "All stones have sulfur, all kinds of soil have it, and those in Wutai, Shanxi and Yizhou, Shandong are prosperous." Today, argon is also a wonder in the world, and its physical properties are quite commendable.
Argon is pure and transparent in color, and it looks like a crystal. Under normal light, there is no different color, but when placed in a specific light, it is a slight blue light, like the shimmer of the night, mysterious and attractive. Its light weight, like clouds floating in the air, can float with the wind, without the risk of falling to the ground.
As for the touch, argon tentacles are warm and moist. Although it is an invisible thing, it touches the human body, and it has a hint of warmth, rather than the cold and light air. Its taste is light, hardly audible, but under the sniff, there seems to be a wisp of fragrance, just like the stamens that bloom in spring, fresh and pleasant.
The state of argon is often gaseous, but at extremely low temperatures, it can condense into a liquid state. Its liquid is clear, and the flow is like the agility of mercury, but it has no sense of its thickness. And argon is extremely stable, and it is not easy to combine with other things. It is like a noble who is independent from the world, and does not easily blend with worldly things.
Furthermore, argon can float on water, insoluble in it, like the dew on the lotus leaf, round and independent. If it is close to fire, argon does not burn or support combustion, just like a calm bystander, in the midst of fire, unmoved, keeping its own characteristics alone, it is a strange thing in nature.

5-Alkyl ether, that is, 5-amyl ether, has its specific structure and properties in the field of chemistry. However, the chemical name expression of 2-methyl ethane ether is not common, and the substance may have a more accurate naming method under the standard nomenclature.
Regarding the chemical stability of methyl ethane ether, it is necessary to start from its structure. Ether compounds generally have relatively stable chemical properties, which is due to the particularity of the C-O-C bond in their molecular structure. In the methyl ethane ether molecule, the oxygen atom is connected to two different alkyl groups, which makes the methyl ethane ether relatively stable under general conditions.
From the perspective of bond energy, the C-O bond has a certain strength, and high energy is required from the outside world to make it break. At room temperature and pressure, methyl ethane ether is not easy to react with common acids and bases, and will not easily react with acids and bases like some active olefins and alcohols.
However, methyl ethane ether is not absolutely stable. Under special conditions such as high temperature, strong oxidants or strong acids, its stability will be affected. For example, when there is a strong oxidant at high temperature, the C-H bond and C-O bond in the molecule of methyl ethane ether may be oxidized, resulting in the destruction of the molecular structure. For example, in a strong acid environment, methyl ethane ether may undergo protonation, which may lead to the breaking of ether bonds and the formation of corresponding alcohols and halogenated hydrocarbons.
Therefore, the chemical properties of methyl ethane ether are relatively stable under conventional conditions, but under specific extreme conditions, its stability will be broken and corresponding chemical reactions will occur.

To make dimethylsilica oil, although the ancient method is simple, it also contains ingenuity.
First, it can be obtained by hydrolysis and polycondensation of dimethyldichlorosilane. Take an appropriate amount of dimethyldichlorosilane and place it in a water-filled vessel. Dimethyldichlorosilane dissolves in contact with water, and the chlorine atom is replaced by a hydroxyl group to obtain dimethylsilanediol. This step requires controlling the speed of hydrolysis to prevent overreaction. After hydrolysis is completed, the temperature rises to polycondensation of dimethylsilanediol, during which water escapes, silica bonds are formed, and silicone oil gradually emerges.
Second, octamethylcyclotetrasiloxane is used as the starting material, and ring-opening polymerization is catalyzed by Choose a base such as potassium hydroxide, or an acid such as sulfuric acid, and put it in octamethylcyclotetrasiloxane. Under catalysis, the ring body opens the ring, and the molecules are connected to form a chain. According to the viscosity of the required silicone oil, the reaction time and temperature are controlled. If you want high viscosity, long-term polymerization and high temperature; if you want low viscosity, short-term temperature drop.
Third, silicon powder and methylene chloride are catalyzed by copper to obtain a mixture of methylchlorosilane. After separating dimethyl dichlorosilane, follow the method of hydrolysis and polycondensation. First, the silicon powder and methylchloride are put into the reaction kettle, catalyzed by copper powder, and heated to promote their reaction. After fractional distillation, pure dimethyl dichlorosilane is obtained, and subsequent hydrolysis and polycondensation < Br >
When preparing, all conditions need to be carefully controlled. The ratio of materials is related to the structure and properties of silicone oil; the temperature and pressure of the reaction affect the direction and speed of the reaction; the type and amount of catalysis affect the effect of polymerization. Only by carefully studying various items can a 5% defoamer dimethyl silicone oil be prepared.

5-Fenvalerate-2-methyl ether cyanogen must pay attention to many key matters during storage and transportation.
Its chemical properties are active, and when storing, the first storage environment should be selected. It should be placed in a cool, dry and well-ventilated place, away from fire and heat sources. Because it is sensitive to heat, it is easy to decompose when heated, damage quality, and even pose safety risks. The warehouse temperature should be strictly controlled within a specific range to prevent danger caused by excessive temperature.
Furthermore, it is necessary to avoid mixing with oxidants, acids, bases and other substances. 5-Fenvalerate-2-cyanogen methyl ether has special chemical properties, and contact with the above substances is prone to chemical reactions, or serious consequences such as combustion and explosion. When storing, ensure that different types of chemicals are properly stored in different areas according to their characteristics, and clearly marked.
When transporting, the packaging must be tight and stable. Select packaging materials that meet the transportation requirements to prevent the packaging from being damaged and leaking during bumps and collisions. Transportation vehicles also need to take protective measures, configure corresponding fire protection equipment and leakage emergency treatment equipment.
Transportation personnel must be professionally trained and familiar with the dangerous characteristics of 5-fenvalerate-2-cyanogen methyl ether and emergency treatment methods. During transportation, it is necessary to regularly check the status of the goods, such as whether the packaging is damaged or leaks. In case of leakage, it should be dealt with immediately according to the established emergency plan, evacuate the surrounding personnel, isolate the polluted area, strictly prohibit irrelevant personnel from approaching, and quickly report to the relevant departments.
In addition, transportation route planning should not be ignored. Sensitive areas such as densely populated areas and water source protection areas should be avoided to reduce the harm that may be caused in the event of an accident.