3-bromopyridine-4-carbaldehyde

Mercury is a highly toxic thing, and everyone is afraid of it. However, the ancients also had a way to explore the synthesis of mercury.
One of the methods for the synthesis of mercury is the burning of dansha. For dansha, mercury sulfide is also. "Baopuzi · Inner Chapter" says: "The dansha is burned into mercury, and the accumulation becomes dansha." The cover is placed in a closed vessel with dansha, which is smelted at high temperature, and the dansha decomposes to produce mercury. For example, the "Shennong Materia Medica" also states that dansha "can be converted into mercury", which is a method commonly used by the ancients to synthesize mercury.
The second method is to react lead and mercury compounds to obtain mercury. " It is reported in the "Huangdi Jiuding Divine Pill Sutra" that some compounds of lead and mercury are co-refined. After complex chemical reactions, the compounds of lead and mercury decompose, and mercury is precipitated.
The third method is to co-refine with other metal ores. Some metal ores contain mercury components, which are co-refined with other substances. By controlling the temperature and time, mercury is separated from the ore.
The ancients synthesized mercury, although it was mostly used for alchemy, in order to seek the medicine of immortality, but the spirit and practice of its exploration also laid the foundation for the development of later chemistry. Unfortunately, the ancients were limited to cognition and did not know the highly toxic hazards of mercury, and often suffered damage due to exposure to mercury in alchemy. Today, the synthesis of mercury has been scientifically accurate, and it is widely used in industrial, medical and other fields. However, caution should be taken to prevent it from harming humans and the environment.

Lead and mercury, its properties are very different. Lead, heavy and dark in color, has a smooth state, is heavy and stable in nature, and is often hidden between mineral soils. In case of fire, it melts, and the manifold is like a liquid, condensing and returning to a solid body. Its nature is yin, mostly containing stagnation, and in hardware, it is quite dignified.
Mercury, also known as mercury, is a liquid metal, as clear as silver, flowing and amorphous. Its nature is very spiritual, and it can evaporate at room temperature, and it is light and clear. Although it is a liquid, it also has the quality of metal, which is flexible and lively, and is very different from ordinary things. Sex likes to attach to other things, and if it encounters gold and stone, it can be reconciled with it.
Both lead and mercury, lead is heavy and static, and mercury is light and moving. Lead is as thick as the earth, and it is calm and stable; mercury is as agile as the sky, erratic and impermanent. The nature of lead is firm, and although it has been sharpened, it is not easy to change its quality; the nature of mercury is soft, and it melts when it is encountered, and has no shape.
Lead and mercury are often the key things in the art of cultivation. Lead can calm the mind and calm the mind, and with its dignified nature, it can suppress the floating sun; mercury can open the orifices and activate the collaterals, and with its agile nature, it can attract qi. The two complement each other, one static and one moving, to form the way of change. The nature of lead and mercury is really the wonder of creation in heaven and earth. In the material nature, it is unique. It is difficult to understand the mystery without in-depth exploration.

"Tiangong Kaiwu" says: "All organic synthesis is related to people's livelihood and has many functions. The application of methyl ether in organic synthesis is quite important. First, methyl ether can be used as a propellant for aerosols. Because of its appropriate vapor pressure, it can quickly vaporize at room temperature, promoting uniform ejection of substances in aerosols. It is widely used in cosmetics, pharmaceutical aerosols and other fields, such as common hairspray, spray agents, etc., all rely on methyl ether to achieve good spray effect. Second, methyl ether is a key intermediate in chemical synthesis. Through a series of chemical reactions, methyl ether can be used to prepare a variety of organic compounds. For example, through specific catalytic reactions, methyl ether can be converted into high-value olefin compounds, which are indispensable in the synthesis of many polymer materials such as plastics and rubber. Furthermore, methyl ether can be used as a clean fuel. With the increase in demand for energy cleanliness, methyl ether can be used as a clean fuel to replace traditional diesel due to its excellent combustion characteristics, high oxygen content, and reduced harmful gas emissions during combustion. It can be used in the transportation field. For example, some new clean power vehicles use methyl ether as fuel, which can effectively reduce the pollution of exhaust gas to the environment. All of these all demonstrate the important application of methyl ether in organic synthesis and related industries. It is an important component of organic synthesis and contributes greatly to the development of people's livelihood and industry.

The price of fish and shrimp varies from time to time in the city of Guanfu, and also varies with the situation. There are many reasons for the value of the city of turtles.

The loach likes to be damp, and often dives between the mud and rivers. Its price is determined by the season. In the spring, the loach is just waking up, and its body is still young. Those who are fresh are asking for it, and the price may be a little high. In summer, it is prosperous and prosperous, and the market is full of goods, and the price is leveled. In autumn, it is fat and plump, and everyone wants to eat it, and its price may rise slightly. In winter, it is hidden under the mud, and it is not easy to catch, so the price is also high. And its price is also related to the distance of the place of origin and the amount of output. If the place of origin is close, the transportation is easy, and the cost is low, the price is low; on the contrary, the price is high. And there are differences in quality. The taste of the wild is pure and the price is expensive, and the breeders are mass-produced and the price is slightly inferior.
As for the turtle, it is a good product for nourishing, and it is important to the world. Its market price also depends on the size and variety. The big turtle has thick meat and strong nourishing power, and the price is higher than that of the small one. Among the varieties, such as the Chinese turtle and the Shanrui turtle, the rare ones are expensive. And the breeding method of turtle has a great impact. Natural free-range breeders, who eat live bait, are better than nature, the meat is firm, the taste is delicious and the price is high; greenhouse fast-range breeders, who grow fast, but the taste and quality are not as good, and the price is also low. Furthermore, the state of market supply and demand determines its price. During the peak season of banquets, those who ask for it are numerous, and if the supply is in short supply, the price will rise; during the off-season, those who ask for it are few, and if the supply exceeds the demand, the price will be depressed.
Therefore, the market prices of 3-loach and 4-turtle are not static, but they are intertwined due to various factors such as season, origin, quality, breeding methods, and market supply and demand, which are dynamically changing.

"Tiangong Kaiwu" says: "All cicadas and the like, the ancients cherished them because they could hear their voices, or that they could know the climate. However, they live and multiply, and they also have their own advantages."

Cicadas and the like, their living conditions are quite exquisite. As far as their habitat is concerned, they prefer places with lush trees and lush branches and leaves. Because trees not only provide them with shelter, but also can be used as a source of food. Cicadas feed on tree sap, so the health of trees is of great importance to their survival. If trees are eroded by pests, or their vitality is damaged due to droughts, floods and other disasters, it is difficult for cicadas to survive for a long time.
Furthermore, climatic conditions are also key. The cicada likes warmth but is afraid of severe cold. In the spring, the climate warms up and all things recover, and the cicada also breaks out of the ground. The summer is hot and the climate is warm and humid, which is when the cicada is active. If the temperature drops sharply in the cold winter, the cicada may lie dormant underground or hide in a tree hole to avoid the cold.
And its living environment needs to be quiet and less disturbing. If there are many people, the noise is endless, and the frequent felling of trees and destruction of vegetation are added, the living space of the cicada will be crowded, and its population will also decrease. Therefore, the survival of the cicada requires a wooded habitat, a suitable climate, and a quiet and less disturbing environment. All three are indispensable. This is the key to its long-term habitat and reproduction.