2,3,5-trichloropyridine-4-carbaldehyde

The main users of two, three, five - trioxy and four - acetylene are the raw materials and lighting resources for industry.
According to Guanfu's "Tiangong Kaiwu", acetylene is flammable and hot, and can be used as a cutting and welding aid in the field of industry. When covering acetylene, its flame temperature is very high, and it can melt metal. Therefore, when cutting all kinds of strong objects, it depends on its force to separate the metal and form the desired shape. When welding, it also relies on this high temperature to make the metal fuse and merge into one, which is sturdy and abnormal.
As for lighting, when electricity was not developed in the past, acetylene lamps were commonly used. In the night, burning acetylene and glowing, although not as bright as today's electric lamps, at that time, it was enough to follow the road, for work, and add light to life. The method of making lamps uses calcium carbide and water to interact, generating acetylene gas, guiding it to burn in the lamp holder, and then obtaining light.
And acetylene is also an important raw material in the chemical industry. From it, various organic compounds can be made, such as synthetic rubber and plastics, which are all important for people's livelihood. Therefore, although acetylene is a simple compound, it has great achievements in industry and life, and it should not be underestimated.

To prepare compounds containing di-, tri-, and pentavalent nitrogen and tetravalent carbon, there are many methods, so let me go through them one by one.
First, it can be synthesized by chemical reaction. With appropriate nitrogen and carbon-containing raw materials, according to chemical principles, control the reaction conditions, such as temperature, pressure, catalyst, etc. For example, select suitable nitrogen-containing organic compounds and carbon-containing reagents, and in a specific reaction vessel, under the help of suitable temperature and catalyst, make the two chemically react. After chemical bond breaking and recombination, the desired compound containing specific nitrogen and carbon can be obtained.
Second, it can be modified after extraction from natural substances. There are many substances containing nitrogen and carbon in nature. Those containing related valence elements are selected from them and purified by physical or chemical methods. Then, by chemical means, the structure is changed, and the nitrogen and carbon elements in the desired valence state are introduced to meet the requirements of the target compound.
Third, the method of electrochemical synthesis can be used. Construct a suitable electrochemical system, and use the substances containing nitrogen and carbon as the electrode material or electrolyte composition. By controlling the parameters such as current and voltage, the oxidation-reduction reaction occurs on the electrode surface, and the nitrogen and carbon elements are guided to form compounds with specific valence states. This method can precisely regulate the reaction process and may have unique advantages for the synthesis of such compounds.
To successfully synthesize, it is necessary to know the chemical properties of each element, understand the mechanism of the reaction, carefully design the experimental steps, and closely monitor and regulate the reaction process, in order to hopefully obtain the required compounds containing di-, tri-, pentavalent nitrogen and tetravalent carbon.

The second, third, and fifth refer to the three elements of hydrogen, oxygen, and carbon. As for the fourth, it should be nitrogen. These four are the foundation of all things, and their physical properties are different, which are described in detail by you.
Hydrogen is a colorless, odorless, and odorless gas with the lowest density. It is the first among all gases, and is often referred to as H. Its melting point is -259.14 ° C, its boiling point is -252.87 ° C. It is difficult to dissolve in water. Because of its density, it is often filled with balloons to make them soar. It is also flammable, mixed with oxygen to burn, and can generate giant energy. This is the foundation of hydrogen energy. < Br >
Oxygen is also a colorless and odorless gas, expressed by O. Its melting point is -218.4 ° C, boiling point is -183 ° C, slightly soluble in water. Oxygen is crucial to the survival of life, and all things depend on it to breathe. And it is flammable. It burns in pure oxygen, and the fire is even more intense.
Carbon, the normal state is solid, and there are many allotropes, such as diamond and graphite. Diamond is extremely hard, the hardest thing in the world, and can be used for cutting and grinding. Graphite is soft and creamy. It is often used as a lubricant and has good electrical conductivity. It is also used in electrode manufacturing. Carbon has a very high melting point, about 3500 ° C, and is chemically stable.
Nitrogen, colorless and odorless, denoted by N. Its melting point is -209.86 ° C, boiling point is -195.8 ° C, slightly soluble in water. Nitrogen is chemically stable, difficult to react with other substances at room temperature, often filled in food packaging to prevent deterioration. Liquid nitrogen has extremely low temperatures and can be used as a refrigerant.
These four are in the world, or in the essence of life, or as the basis of energy, or as needed by industry. Each has its own capabilities, and it has great contributions to nature and human beings.

As for tetraethylene, its market price is also important in the industry.
Fudienes have a wide range of uses and are used in the field of chemical industry. They are the base materials for various products. Because of their difficulty in making and the abundance of raw materials required, their prices fluctuate frequently. If the raw materials are sufficient and easy to make, the price may stabilize and decline; if the raw materials are thin and difficult to make, the price must rise and difficult to suppress.
Trienes have a variety of functions and are often the key quality of high-end chemical products. The price is determined not only by supply and demand, but also by the new and old processes. When new techniques are introduced, the production is efficient and the cost decreases, and the price also decreases; if the old method is kept, the production is inefficient and the cost is high, and the price is often above it.
Pentene has an indispensable position in special chemical industries. Its market is narrow, but the need for precision, and the change in price is mostly due to the need for specialization. If there are many and refined needs, the price will be high; if there are few and widespread needs, the price will be flat.
As for ethylene, it is a large chemical industry. Its market is wide and the demand is constant, and the price movement depends on the global production and supply, political policies, and market conditions. If the production is abundant and the supply is sufficient, but the demand has not increased, the price will be weak; if the production is reduced and the supply is insufficient, and the demand is still prosperous, the price will be firm.
Overall, the market prices of di-, tri-, and pentatriene and ethylene are all determined by supply and demand, raw materials, processes, and policies. The industry should be aware of these changes and take into account the situation in order to profit from the market.

The place where two, three, and five husbands gather is called the place where three incense sticks are stuck. Among the four, the genus of Jiageng, is related to storage and transportation, and there are many taboos and must not be ignored.
In terms of storage, the first priority is the stability of the environment. Jiagong should be stored in a cool and dry place. If it is placed in a humid place, it will be perishable and damage its texture. Jiagong gold is hard in texture. Although it is not afraid of water and moisture, it should not be exposed to the hot sun to prevent it from becoming brittle. And both should be kept away from fire sources. Jiagong is flammable, and Jiageng gold is deformed when heated, which is not conducive to long-term preservation.
As for transportation, pay attention to the season and route. The transportation of armor wood should be selected in spring and autumn, when the climate is mild and there is no disturbance of heat and cold. When handling, the action should be gentle, so as not to collide, lest the body be injured. When transporting gold, the road should be flat and avoid bumps to prevent damage. If passing through waterways, be more careful to waterproof, so as not to rust the gold.
In addition, the equipment for storage and transportation is also exquisite. When storing armor wood, it is appropriate to use bamboo or wooden tools, because of its similar nature, it can keep the wood gas from dissipating. When storing armor wood, it is better to use an iron or stone container to protect its quality. When transporting, the armor wood can be bundled neatly and placed in a stable place in the car; the gold needs to be firmly fixed to prevent sliding and collision.
Also, the handling of people is also very important. Storers should check frequently and ventilate in a timely manner to keep the armor wood from mildew and gold from rust. Transporters need to be familiar with the road conditions. In case of bad weather, take precautions early and must not be taken lightly. In this way, the A-Geng can be stored and transported in good condition and used to its best.