2-phenylpyridine

The kirin is also a benevolent beast, and its function in ancient times is the most obvious. "Tianguan Kaiwu" has clouds, and the image of the kirin is often associated with auspiciousness.
Looking back at the past, the use of the kirin is first in the surface. The king of ancient times, if the government is harmonious and the world is flat, the kirin often appears in the wild, thinking that it is a sign of Jiarui. "Spring and Autumn" records the fourteenth spring of Duke Ai of Lu, when everyone was surprised when he hunted in the west and obtained the Lin. The appearance of this Lin shows that there may be something extraordinary in the country of Lu. Although the situation at that time was complicated, when the kirin came out, everyone believed that it was a sign of auspiciousness, thinking that the world would be peaceful.
Furthermore, the kirin also has a heavy responsibility in ceremonial sacrifices The ancient ancestral temples offered sacrifices, and the ceremonies were grand. The shape of the kirin often appeared on the sacrificial vessels and murals to celebrate the solemnity and solemnity. It symbolizes the prosperity of the family and the prosperity of the country. When emperors sacrificed heaven and earth, the symbol of the kirin was also indispensable. They thought that they could communicate with the gods and pray for blessings from heaven, good weather and abundant grain.
In addition, the kirin also has far-reaching significance in cultural inheritance. Its image is mostly found in poems, songs, paintings and carvings. Literati and writers used the kirin as an image to express their ambition and pride, and place their beautiful visions on it. For example, "The kirin is famous in the kirin pavilion, and you see the return of the splendid". Among them, the kirin is a symbol of success. Craftsmen carved the kirin, or in the palace, or in the temple, to increase its majesty and auspiciousness. The shape of the unicorn, passed down from generation to generation, has been deeply rooted in the soil of Chinese culture and is a symbol of national spirit.
To sum up, the use of the unicorn is related to auspiciousness, etiquette and culture. It is an important symbol of ancient times. It has far-reaching influence on the evolution of Chinese civilization and is still valued by the world today.

The silicon crystal is the spiritual object of heaven and earth, which is contained in the mountains and rivers, and has many specific physical properties.
First of all, its conductivity, silicon crystal is between conductors and insulators, and is a semiconductor material. At room temperature, its conductivity is not strong, but if it is irradiated, heated, or doped with impurities, its conductivity can be greatly changed. This property is very useful in electronic devices. For example, transistors, depending on the semiconductor properties of silicon crystal, can control the switching and strength of current, and thus become the cornerstone of modern electronic devices.
Second on its optical properties. Silicon crystal has a unique response to light, can absorb light of specific wavelengths, and can also emit light under specific conditions. In the field of optoelectronic devices, such as solar cells, silicon crystals can convert light energy into electricity, opening up new avenues for human access to clean energy; and such as Light Emitting Diode, ingeniously designed, silicon crystals can also emit light of a specific color for lighting and display and many other aspects.
Furthermore, silicon crystals have hot topic stability. Although exposed to high temperatures, their physical and chemical properties can remain relatively stable, and they are not easily melted or deformed. This allows silicon crystals to play a key role in the operation of industrial production and electronic equipment in high-temperature environments, ensuring the stable operation of equipment.
In addition, silicon crystals have high hardness and solid texture. Its crystal structure is dense and can withstand large external forces without damage. Therefore, it is also widely used in machinery manufacturing, wear-resistant materials and other fields.
As for its lattice structure, it has a regular and orderly state. This ordered structure provides a specific path and space for the movement of electrons and the incorporation of impurities at the microscopic level, which in turn profoundly affects the physical properties of silicon crystals and lays the foundation for their application in various high-tech fields.
Silicon crystals, with their unique physical properties, are shining brightly in today's world of technology, such as bright pearls, in many fields such as electronics, optics, energy, etc., promoting the continuous progress of human civilization.

Erzhizi, its chemical properties are wonderful. This gold, the nature of the phase is fixed, and it is not easy to be easily synthesized by biochemistry. As in the air, it is oxidized, so it can always keep its light, and it will last for a long time without decay. It has been used in ancient times and the present. It is often used as a tool and a tool. It can be used by the world not only for general transactions, but also as a tool to increase the elegance of life.
If it encounters an acid, such as sulfuric acid and acid, the two children will also react and can keep their original properties. However, if it is oxidized, such as aqua regia, the aqua regia is made up of acid and nitric acid in a ratio of three to one, and its oxidizability is low. If it is encountered by a second child, it will be invaded by it, and it will react biochemically, dissolve it, and dissolve others.
Furthermore, the second child can be determined under normal conditions, but it can also exhibit activity in a certain degree and a specific chemical environment. For example, if it is added to a certain extent, it can react to some active non-gold elements, such as oxygen and sulfur. When sulfur meets, it generates a vulcanization layer, which is black in color. Therefore, if the container is left in a sulfur-containing environment for a long time, black spots will appear on its surface. This is the process of chemical transformation. Moreover, the chemical properties of two particles are not only fixed, but also show activity due to changes in external conditions, which is very wonderful.

There are many methods for synthesizing 2-naphthyl propionic acid, and several common ones are briefly described below.
One is the synthesis method using naphthalene as the starting material. First, under specific conditions, the alkylation reaction of naphthalene and acrylonitrile occurs under the help of a catalyst to obtain 2-gram- (2-cyanoethyl) naphthalene. Subsequently, the product is hydrolyzed in an acid or alkali-catalyzed environment, and the cyano group is converted to a carboxyl group to obtain 2-naphthalene propionic acid. The raw materials in this way are easy to obtain, but the reaction steps are slightly complicated. It is necessary to pay attention to the precise control of the reaction conditions to improve the yield and purity. < Br >
The second is a method using 2-naphthalaldehyde as the starting material. The Knoevenagel condensation reaction between 2-naphthalaldehyde and malonic acid occurs in the presence of basic catalysts such as pyridine to generate 2- (2-naphthalene) acrylic acid. After that, the double bond is reduced with the help of suitable reducing agents, such as hydrogen and metal catalysts (such as palladium-carbon), and finally 2-naphthalenylpropionic acid is obtained. This method is relatively simple, the reaction conditions are relatively mild, and the yield is quite good, which has great application prospects in industrial production.
Furthermore, the Grignard reagent method can be used. The corresponding Grignard reagent 2-naphthalene magnesium bromide is first prepared from 2-bromonaphthalene. Then, it undergoes nucleophilic addition reaction with propionaldehyde to generate 2- (2-naphthalene) propanol. Finally, the alcohol is oxidized to carboxylic acid by suitable oxidants, such as potassium permanganate or potassium dichromate, etc., to obtain the target product 2-naphthalene propionic acid. Although the operation is slightly complicated, this method can effectively construct carbon-carbon bonds, which is of great significance for the synthesis of specific needs.
Each synthetic method has its own advantages and disadvantages. In practical application, it is necessary to comprehensively weigh the availability of raw materials, cost considerations, product purity requirements and many other factors to choose the most suitable way.

In today's market, what is the price of 20% of iridium? Iridium, a rare metal, is also widely used in various industrial and technological fields.
Looking at the city of today, the price of iridium often varies with the supply and demand of the city, the policies of the government, and the situation of the world. In the past few years, its price fluctuated, and there was no fixed number. In the past, or the price of thousands of gold per ounce, but in the near future, or due to the increase or decrease of mineral sources and the change of demand, the price also fell.
Roughly speaking, when the market is stable, the price of 20% of iridium gold, if measured by weight, can reach hundreds of gold per gram. Cover 20% of iridium, in which the content of iridium is fixed, the ratio of non-pure iridium, but also because of the rarity of iridium, the price is not low. If it is well-made and used in a special way, the price may be higher.
However, the market is impermanent, and the price is also impermanent. All kinds of accidents, such as changes in mineral fields, obstacles to international business routes, and the emergence of new technologies, can make the price of iridium change. Therefore, if you want to know the exact price of 20% of iridium, you can get an approximate number depending on the reality of the market, consult people in the industry, or look at the reports of various cities. It is difficult to conceal it in a word.