2-2-(tri-n-butylstannyl)-4-tert-butylpyridine

Two or two "three positive and one basic dysprosium base", and four "pseudo-one basic direction", what is the main way to use it?
The two "three positive and one basic dysprosium base" and "pseudo-one basic direction" are all useful in the techniques involved in "Tiangong Kaiwu". For those who are "three positive and one basic dysprosium base", "three positive" is the method to regulate their right path and set their right path, so as to ensure that everything goes smoothly and not deviate. "One foundation" is the foundation for establishing things, like the cornerstone of building a room, which cannot be shaken. And "dysprosium foundation" is like the guide of an arrow, leading all things to a swan.
As for the "pseudo-one-basic direction", the main way to use it is to distinguish between true and false, and to distinguish right from wrong. In the inheritance and practice of skills, there are often all kinds of chaos, or there are those who are false and false. "Pseudo-one-basic direction" can make craftsmen discern, so as not to be confused by false methods, so as to ensure the purity of skills.
And like the art of smelting, "three positive and one basic dysprosium base" can determine the furnace temperature, mineral processing materials, and control the temperature, making the casting machine excellent. And "pseudo-one-basic direction" can distinguish the authenticity of mineral materials, and detect the correctness and error of the casting method, so that the smelting technology can be passed down from generation to generation without losing its authenticity. Another example is the art of textiles, "three positive and one base dysprosium base" regulates the uniformity of spinning thread, the order of brocade, and the design of color, while "pseudo-one base direction" can distinguish the advantages and disadvantages of silk thread, and the cleverness of weaving method makes the fabric exquisite and high-quality.
Therefore, "three positive and one base dysprosium base" is the rule and foundation of industry, and "pseudo-one base direction" is the essential for distinguishing between falsehood and authenticity. Both are indispensable in the industry of hundreds of workers, and jointly supplement the inheritance and development of skills, so that the work of the world can be used skillfully and become its own tools, so as to benefit people's livelihood and to show off the civilization of Xia.

The synthesis method of the so-called tributyltin, tetraethylbutyltin, has many ingenious points, and I am here for you.
First, it can be prepared by the reaction of halogenated hydrocarbons and metal-organic compounds. When halogenated hydrocarbons meet metal magnesium, they become Grignard's reagent. This reagent is quite active. When encountering tin halide, a nucleophilic substitution reaction occurs, and the halogen atom is replaced by butyl, gradually forming tributyltin and tetraethylbutyltin. In this process, the control of reaction conditions is crucial. The choice of temperature and solvent affects the yield and purity of the product. < Br >
Second, the addition reaction of organotin hydride and unsaturated hydrocarbons is also a good method for synthesis. Under the action of an appropriate catalyst, the tin hydrogen bond in the organotin hydride is broken, and the double or triple bond between the hydrogen atom and the unsaturated hydrocarbon is added, thereby introducing butyl to construct the structure of the target product. However, this method requires a very high catalyst, and it is necessary to select the one with good activity and selectivity in order to make the reaction proceed efficiently and reduce the occurrence of side reactions.
Third, the purpose of synthesis can also be achieved by the reaction of tin and organohalide in the presence of a base. The function of the base is to promote the reaction, so that the tin atom can more easily combine with the halogen atom, and then form an organotin compound. However, this process requires attention to the amount and strength of the alkali to avoid overreaction or other side reactions.
All these synthesis methods have their own advantages and disadvantages. Experimenters need to weigh the cost of raw materials, the difficulty of reaction, the purity of the product and many other factors according to actual needs, and choose carefully to obtain the desired result.

Dicyanodiamine, commonly known as dicyandiamide. Its physical and chemical properties are as follows:
In terms of appearance, the pure product is a white crystalline powder with a fine texture. Its melting point is quite high, reaching 209.5 ° C, and it is solid at room temperature and pressure, with good stability.
When it comes to solubility, it is slightly soluble in water. At 25 ° C, it can only dissolve 2.26 grams per 100 grams of water, and the solubility is slightly increased in hot water. It is also slightly soluble in ethanol, but poorly soluble in organic solvents such as ether and benzene.
Its chemical properties are relatively active, weakly basic, and can react with acids to form salts. In case of strong acids, corresponding salt compounds can be formed. Under heating conditions, decomposition reactions will occur to produce cyanamide and other substances. Due to its molecular structure containing two amino groups and two cyano groups, it can participate in many organic synthesis reactions and is widely used in the chemical industry. It can be used as a raw material for synthetic resins, which can be polymerized with other compounds to obtain synthetic resins with different properties. It is also an important intermediate for the preparation of medicines and pesticides, and plays a key role in the synthesis of related medicines and pesticides. In the field of fertilizers, it can be used as a nitrogen fertilizer synergist to prolong the efficiency of nitrogen fertilizers and improve the utilization rate of fertilizers.

Two-two -%28%E4%B8%89%E6%AD%A3%E4%B8%81%E5%9F%BA%E9%94%A1%E5%9F%BA%29 The meaning of this part of the expression is unclear, and it seems that there are coding or input errors, which is difficult to understand accurately.
Regarding the precautions of tetra-alkynylbenzene in the process of storage and transportation, the answer in the classical Chinese style of "Tiangong Kaiwu" is as follows:
The alkynylbenzene is strong and sensitive, and it is necessary to be cautious when storing and transporting. When storing, it is advisable to choose a cool and dry place, avoid the sun and heat, and do not keep it near water and fire. It is easy to move in case of heat, or cause unexpected changes. And when it is separated from other things, to prevent mischief caused by mixing.
When transporting, the vehicle and ship should be clean and clean, free from other filth. Drivers and passengers should also be cautious, familiar with their nature, and do not slack off. Avoid bumps and shocks on the way, drive slowly and steadily. If it is hot in the summer, pay special attention to the method of cooling down.
In addition, whether it is stored or transported, it is necessary to prepare fire extinguishing equipment and protective devices. Once there is a police, you can quickly apply rescue to ensure the safety of people and goods. These things are related to safety and must not be ignored.

Tri-n-butyl tin, which is found in many chemical products in the world. However, it has a great impact on the environment and human health.
Looking at its impact on the environment, in aquatic ecosystems, tri-n-butyl tin is highly toxic. If this substance is present in water, it will seriously endanger aquatic organisms. For example, many aquatic plankton are extremely sensitive to it. Once the water body is polluted by tri-n-butyl tin, the survival and reproduction of plankton are hindered. These plankton are the foundation of the aquatic food chain, and their quantity changes will be transmitted layer by layer, causing the structure and function of the entire aquatic ecosystem to be disrupted. In the soil environment, tri-n-butyl tin can affect the activity and community structure of soil microorganisms, thereby interfering with soil material circulation and energy conversion, and destroying soil ecological balance.
As for the impact on human health, it should not be underestimated. If the human body is exposed to tri-n-butyl tin, it can be absorbed through the skin, inhaled through the respiratory tract, or ingested due to ingesting contaminated food and water. It can interfere with the human body's endocrine system, like disrupting the orderly rhythm of hormone regulation in the body. Many studies have shown that long-term exposure to this substance can affect the human reproductive system, lead to abnormal reproductive function, and even increase the risk of certain diseases. In the nervous system, tri-n-butyl tin can damage nerve cells, interfere with the transmission of nerve signals, and cause symptoms such as headache, dizziness, and memory loss.
In summary, although tri-n-butyl tin may be useful in some chemical fields, it is harmful to the environment and human health. It should be treated with caution and efforts should be made to reduce its emissions in the environment and contact with the human body.