2-(tributylstannyl)pyridine

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, which has detailed records and explanations on many things. Regarding the three-pronged arrowhead, its main uses are as follows:
During the war, the three-pronged arrowhead was used as the arrowhead head of the arrow, which could be called a weapon to defeat the enemy. This arrowhead head has a unique shape, and the three-pronged design greatly enhances its piercing ability. In long-distance archery, the sharp three-pronged arrowhead can easily penetrate the enemy's armor protection, causing serious damage to the enemy's soldiers. Due to its unique shape, compared with the ordinary arrowhead head, the wound on the back of the armor is more complicated, which not only increases the difficulty of treatment, but also causes the enemy to reduce combat personnel, greatly affects the enemy's combat effectiveness, and plays a key role in killing on the
When hunting, the tricuspid arrowhead is also a powerful tool for hunters. Many prey in the wild have rough skin and thick flesh, and ordinary arrowheads are difficult to deal effective damage to them. The tricuspid arrowhead can penetrate deep into the body of the prey with its sharp three points, improving the hunting success rate. Whether it is a larger beast or an agile bird, the tricuspid arrowhead can play a role in helping hunters capture prey to meet their needs for food and fur.
In tribal conflicts or self-defense scenarios, the tricuspid arrowhead can also provide powerful means of defense and attack. When facing external threats, weapons equipped with tricuspid arrows can deter and attack incoming enemies, ensuring the safety of tribe members or themselves.

Trihexyl cadmium is an important reagent in organic synthesis. There are various synthesis methods, the following are common ones:
1. ** Grignard reagent method **:
- Reaction of halogenated alkanes with magnesium chips in anhydrous ether or tetrahydrofuran to make Grignard reagent. For example, 1-iodohexane reacts with magnesium chips in anhydrous ether to produce hexyl magnesium bromide:\ (C_ {6} H_ {13} I + Mg\ xrightarrow [] {anhydrous ether} C_ {6} H_ {13} MgI\). < Br > - Then hexyl magnesium bromide is reacted with cadmium salts, such as cadmium chloride (\ (CdCl_ {2}\)) at low temperature to obtain tri-hexyl cadmium:\ (3C_ {6} H_ {13} MgI + CdCl_ {2}\ xrightarrow [] {low temperature} (C_ {6} H_ {13}) _ {3} Cd + 3MgICl\). This method has milder reaction conditions and relatively easy availability of raw materials. It is a commonly used synthesis route.
2. ** Alkyl lithium reagent method **:
- Alkyl lithium reagent is prepared by first reacting halogenated alkanes with metallic lithium. Taking 1-bromohexane with metallic lithium as an example, the reaction in anhydrous pentane or hexane solvent produces hexyl lithium:\ (C_ {6} H_ {13} Br + 2Li\ xrightarrow [] {anhydrous pentane} C_ {6} H_ {13} Li + LiBr\). < Br > - After that, lithium hexyl is reacted with cadmium salts, such as cadmium bromide (\ (CdBr_ {2}\)), to synthesize tri-hexyl cadmium:\ (3C_ {6} H_ {13} Li + CdBr_ {2}\ xrightarrow [] {low temperature} (C_ {6} H_ {13}) _ {3} Cd + 3LiBr\). This method has high reactivity, but the alkyl lithium reagent is more active and requires strict anhydrous and anaerobic operation.
3. ** Direct synthesis method **:
- Under specific catalyst and reaction conditions, hexene, hydrogen and cadmium powder are directly reacted to try to synthesize tri-hexyl cadmium. Although the steps of this method are relatively simple, the reaction conditions are harsh, the catalyst requirements are extremely high, and the reaction selectivity and yield need to be optimized and improved. Currently, it is not as widely used as the first two methods.

Trinitrotoluene, known as "TNT" in the world, is a high explosive. Its physical and chemical properties are unique and of great significance.
From the perspective of physical properties, trinitrotoluene is a light yellow crystal under normal conditions, odorless and bitter. Its melting point is about 110-114 degrees Celsius, which makes it possible to maintain a solid state in a specific temperature range, making it easy to store and transport. Due to its stable crystal structure, it is not easy to evaporate at room temperature and pressure, which greatly enhances the safety of storage and reduces the risk of concentration changes due to volatilization and flammability and explosion.
When it comes to chemical properties, trinitrotoluene is extremely active. Many nitro groups in the molecule give it strong oxidizing properties. In case of hot topics, open flames or contact with strong oxidants, it is easy to cause violent explosions. This violent reaction originates from the unstable chemical bond between nitrogen and oxygen elements in the nitro group, which breaks under suitable conditions and releases huge amounts of energy.
Trinitrotoluene is insoluble in water, but soluble in organic solvents such as acetone, benzene, and toluene. This solubility is of great significance in industrial production and application. With the help of organic solvents, trinitrotoluene can be better processed and treated for the formulation of explosive products with specific concentrations and properties.
In addition, the chemical stability of trinitrotoluene also needs attention. Although relatively stable at room temperature, long-term storage in an uncomfortable environment, such as high temperature, high humidity or contact with certain catalytic impurities, may still slowly decompose, generating harmful gases, affecting its quality and safety.
In summary, the physical and chemical properties of trinitrotoluene determine its wide application in military and industrial blasting fields, and also require strict safety procedures to be followed when using and storing to avoid danger.

When casting three-winged bronze goose, there are many taboos when casting, storing and transporting, so pay attention to it in detail.
When casting goose, the first material is selected. The copper must be pure, and the impurities must be removed, so that a good tool can be cast. And the ratio of alloys is very important. The amount of tin and lead is related to the hardness and toughness of the goose. Tin is hard and brittle, while lead is soft and dull. Only the proportion is appropriate, the goose edge is sharp, and the goose body is strong.
The casting mold should not be underestimated either. The fineness of the mold determines the shape of the goose. The lines must be smooth, the decoration should be clear, and if there is a slight mistake, it will lose its quaint and solemn state. When pouring, the control of the heat is the key. If the fire temperature is too high, the copper liquid will flow through quickly, which is easy to cause bubbles; if the fire temperature is insufficient, the copper liquid will stagnate and it will be difficult to form a complete shape.
When hiding, the environment should be dry. Moisture is easy to corrode copper, and over time, the body will be patina green, which can even cause rust and perforation, which will damage its appearance and texture. Store it in a place that should be protected from direct sunlight. Exposure to sunlight will also accelerate its aging.
When transporting, the packaging must be comprehensive. Wrap it in a soft object to prevent it from colliding. The road is bumpy, and if you are not careful, cracks may appear on the body. And the person who transports it should be careful not to damage the body with rough hands and feet.
Casting and transportation of three-wing bronze goose, all details must be paid attention to in order to ensure the integrity of the goose and pass on its thousand-year-old charm.

The market prospects of "312 Foundation Nails and Leopard Foundation" are as follows:
At this moment, "312 Foundation Nails and Leopard Foundation" is in the market, and it is beginning to show signs of prosperity. Looking at its situation, it has gradually emerged in the fields of business circulation and people's livelihood in recent years.
Since its appearance, people in the market have heard of it. In the industry of workshop construction, "312 Foundation Nails and Leopard Foundation" is used by craftsmen. Its quality is solid and the craftsmanship is exquisite, so that the completion of utensils is more perfect. Therefore, the owner of the workshop is more favored, and it is used as a material. It is well-made and sold in the market. It is quite praised, and the needs of the market are also growing.
As for the way merchants sell, the things involved in "Three-One-Two Key Nails and Leopard Base" circulate in all directions. Because of its outstanding quality, there are no lack of traces of long-distance trade. The northern and southern counties have seen its shadow, and it has gained a lot on the way of colonization. The people use it every day, and they also rely on it, whether it is a household tool or a work tool, because of its quality.
And in this world, the government is smooth, the business travel is frequent, and the city is prosperous. "Three-One-Two Key Nails and Leopard Base" took this opportunity to spread its name and expand its city. All the benefits made it quite impressive before the city. Although there are also disputes in the same industry in the city, "Three One Two Base Nails Leopard Base", with its quality and workmanship, can defend its territory in the competition, and then expand its boundaries. In the long run, it is expected to be the leader in the city. Among all kinds of goods, it will take the lead and lead the fashion. The prosperity of its city can be expected in the future.