2-BROMOPYRIDINE-5-CARBOXALDEHYDE

2-%E6%BA%B4%E5%90%A1%E5%95%B6 is the second one, what is the main use of 5-A? In the chapter "Nai Grain · Rice" of "Tiangong Wuwu", the use of A-A has some uses, which is expressed in classical Chinese as follows:
A-A-A-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B-B In the classics of Materia Medica, the nail has the effect of clearing and dispersing the body. It can treat diseases such as, bone steaming, and so on. In the middle of, often use the nail to match other things, Cheng Wan Sanjiedan, effect.
In addition, in the sacrificial activities of culture, also occasionally has a place. The ancients used one of their things, in a specific style,, to express the reverence and prayer of the gods of heaven and earth and the ancestors, hoping to bring blessings and disappear, rain, home peace. In other words, A

The synthesis method of Fu 2-cyanopyridine-5-formonitrile has been used by many parties throughout the ages. The following is a detailed description for you.
First, based on [starting material 1], through [reaction 1], the [key group of raw material 1] and [reagent 1] occur [specific reaction type 1], and the intermediate product [intermediate product 1] can be obtained. This step requires attention to the reaction temperature, which should be controlled at [X1] ° C, and the duration is about [Y1] hours to ensure a smooth reaction. Then, [intermediate product 1] and [reagent 2] carried out [specific reaction type 2] under [reaction condition 2], and obtained 2-cyanopyridine-5-formonitrile. Although this path is a little complicated, the yield is quite impressive, up to [Z1]%.
Second, choose [starting material 2] as the starting material, and by [reaction 3], make [raw material 2 key group] and [reagent 3] start [specific reaction type 3], and directly form the target product 2-cyanopyridine-5-formonitrile. This method is concise and clear, and the reaction conditions are relatively mild. The temperature only needs to be maintained at about [X2] ° C, and the reaction time is about [Y2] hours. However, the reagent [reagent 3] used in this method is quite rare, the cost is slightly higher, and it may be constrained in large-scale preparation.
Third, start with [starting material 3], and first go through [reaction 4] to form [intermediate product 2]. This reaction needs to be carried out in [reaction condition 4] under the action of a specific catalyst [catalyst 1]. Subsequently, [intermediate product 2] goes through [reaction 5], and finally 2-cyanopyridine-5-formonitrile is obtained. Although this approach is complicated, it can make clever use of common raw materials, and is more environmentally friendly, with few reaction by-products.
All synthesis methods have their own advantages and disadvantages. In practical applications, according to specific circumstances, such as the availability of raw materials, cost considerations, yield requirements, and impact on the environment, the appropriate method can be carefully selected to achieve twice the result with half the effort.

Mercury is magical in nature, and its quality has many peculiarities. Mercury is often in a liquid state, warm and moist, like smart water, but its dignified feeling is different from ordinary water. The luster shines, like the moonlight pouring out, which is very eye-catching.
The boiling point of mercury is quite low, and it can easily turn into a gaseous state when heated. It rises invisible and hides in the void. When it is cold, it can quickly condense and return to a liquid state. This change is just like the transformation of yin and yang, which is instantaneous.
Furthermore, the chemical properties of mercury are lively and can fuse with many metals to form amalgam. This amalgam has the characteristics of mercury and other metals, and has a wide range of uses. And mercury is toxic. If accidentally contaminated or inhaled, it can cause damage to human organs and endanger life, so extreme caution is required when using it.
Mercury also occupies an important place in the art of alchemy. The ancients believed that mercury has magical power and can be refined to prolong life. However, due to the lack of full knowledge of the characteristics of mercury, many alchemists died due to mercury poisoning.
Looking at the physical properties of mercury, it is a liquid metal at room temperature, with a silvery white color and a soft texture, which can change with the shape of the vessel. Its density is quite high, and it feels heavy when placed in the hand. The surface tension of mercury is very strong, and it can form a bead, which rolls freely on the plane and does not easily blend with other things. This is the unique physical properties of mercury, which is unique among all things and is a wonder of heaven and earth creation.

Mercury, like mercury, has a volatile flow and is liquid at room temperature, with a metallic luster. It is silver-white, heavy, and has a high density of 13.59 grams per cubic centimeter. Mercury is very volatile, and at room temperature, it can slowly evaporate into mercury vapor. This gas is colorless and odorless, but toxic. If inhaled, it is easy to cause poisoning.
Mercury has relatively stable chemical properties. At room temperature, it is difficult to react with oxygen. However, when heated to more than 300 degrees Celsius, it can combine with oxidation to form mercury oxide. Mercury can react with halogens, and when exposed to chlorine, bromine, iodine, etc., it can form corresponding halides.
Mercury and sulfur are very easy to combine, and when the two meet, they quickly form mercury sulfide. This is a common method for removing mercury. Mercury sulfide is bright in color and is often used as a pigment.
Mercury can form alloys with a variety of metals, which are called amalgams. Metals such as gold and silver can form amalgamates with mercury. In the past, precious metals such as gold and silver were often extracted by this method.
Mercury has many compounds with different chemical properties. Such as mercury chloride, which is highly oxidizing and toxic; mercury nitrate is easily soluble in water and is corrosive.
Mercury was widely used in ancient times. In alchemy, mercury is an important thing. Warlocks believe that it has a magical effect and can be used to refine the medicine of longevity. Although this is absurd, it reflects the importance attached to mercury at that time. In the field of medicine, mercury compounds were also used to treat diseases, but due to the toxicity of mercury, they are now less used. Mercury has also played an important role in metallurgy, chemical industry and other industries, but its toxicity is very harmful to the environment and human body, and its use is now strictly restricted.

When storing and transporting mercury, it is necessary to pay attention to all kinds of things.
When storing mercury, it is the first choice for heavy containers. It is advisable to use a sturdy and tight device to prevent its leakage. Mercury cover has the property of dispersion. If there is a slight gap, it is easy to escape, not only damaging its quality, but also escaping mercury, which is harmful to people and things. In the past, if someone was careless, mercury leaked to the ground, and soon, everyone indoors felt uncomfortable, and the poison of mercury cover was also.
Second, the environment is important. Where mercury is stored, it should be cool and dry, and avoid high temperature and humidity. Mercury is volatile at high temperatures, increasing the risk of leakage; moisture may cause mercury to chemically react with the wall of the container, damaging the container and making the mercury impure.
As for the transportation of mercury, it is best to be safe. When handling, be careful not to break the container due to shock. If the bumps are severe on the way, the container breaks, and the mercury overflows, the disaster will be imminent. And the transporter should have professional knowledge, familiar with the characteristics of mercury and emergency measures to prevent accidents.
Furthermore, it is also important to have a clear logo. In the storage and transportation equipment, the word "mercury" should be clearly marked, and the toxicity and precautions should be noted, so that everyone knows the risk and dare not ignore it.
In short, the storage and transportation of mercury is related to safety, and every strand must be paid attention to. If there is a slight mistake, it may lead to a major disaster.