2-Pyrazinecarboxamide

What is the main use of 2-% to go to the mountain of Qu Fu? Although Tiangong Kaiwu is not recorded in classical Chinese, the following answers are in a style similar to that of the ancients:
2-% to the mountain of Qu Fu, its use is quite critical. This mountain is rich in red copper. Red copper was used in ancient times and was widely used. First, it can be cast as utensils, such as tripods and zun, which are necessary for solemn occasions such as sacrifices and banquets, highlighting status and etiquette regulations, and has extremely high cultural and symbolic significance. Second, it can be made into weapons, such as swords, Ge, etc. In a world of frequent wars, the sophistication of weapons is related to life and death, and the rise and fall of the family and country. Therefore, the weapons forged by red copper are the key to protecting the family and defending the country and expanding the territory. Third, red copper can be used to create daily uses, such as bronze mirrors, for care; and such as kettles and pots, which are used for cooking, which greatly facilitates the lives of the people.
In addition to red copper, Qu Father's Mountain may have other uses that are not well observed, but red copper alone has had a profound and indispensable impact on the lives, culture, military and many other aspects of the ancients. It is indeed an extremely important resource for the ancients.

2-% of the lung is a rare medium, its nature is special, and its efficacy is also special. This material is sweet in taste, flat in nature, and has two characteristics of lung and liver.
First of all, it has a good effect on the lung. It can improve the function of the lungs and increase the ability of the lungs to control and breathe. For people with weak lungs, often feeling short, coughing, and respiratory distress, using this medicine can relieve general fatigue, help the lungs recover, and make the breathing slow. Such as tiredness, causing lung fatigue, low cough, and asthma. Treatment with 2-% of the lung can improve the symptoms one by one.
Secondly, it has the power of reducing the blood of the liver. The liver stores blood. If the liver blood is insufficient, it often causes dizziness, insomnia, and numbness in the limbs. 2-% of the lungs can nourish the liver blood, so that the liver has a problem, and the disease can be solved. For women who cause a lack of blood due to the liver, it also has a rational effect, which can make the period normal and the amount is moderate.
Furthermore, 2-% of the lungs have the ability to clear and detoxify. It can relieve the toxicity of the lungs and liver, and it can relieve the throat pain, dry mouth and tongue caused by the lung, and the red eyes and pain caused by the liver. Bitter mouth and other diseases are effective. It can clear the fire of the lungs and liver, clear the evil, and eliminate the disease itself.
In addition, it has a certain calming effect. It can calm the mind, for those who are emotionally uncomfortable, mentally disturbed, insomnia and forgetfulness, and can help them calm the mind, improve sleep, improve mental health, and make people calm. In addition, 2-% is used to calm the lungs and lungs, and has many effects. It has an important value in the Middle East.

First and foremost, the place is of paramount importance. It is not difficult to create two layers of armor, which is a delicate technique.

The first one is to pay more attention to things in the process. It is not difficult to clear the place, but also to pass well, and the light is suitable. This can ensure that the living environment of the world is appropriate, which is conducive to its health and education. If the earth is dark and the tide is dark, it is prone to disease, which is not conducive to the formation of the world.
Furthermore, the materials must be excellent. For the body of the building, the materials used need to be durable in order to withstand the test of the moon. It is appropriate to use hard and hard materials to protect the ability to prevent it. The limbs of the world also need to use suitable materials to make them live freely and lifelike.
To create a flower, the technique should be exquisite. Shape the shape first, from the bottom to the tail, back to the abdomen, the proportion needs to be clear, and the profile should be clear. Carve the flower of the flower, the heart is made of it, imitating the natural shape, so that the principle is realistic. In the shaping of the limbs and the body, attention should be paid to the ups and downs of the muscles, the shape of the body, and the posture of the body.
In addition, the control of the heat should not be ignored. Baking, to make it hard, but the heat is fierce, easy to crack; the heat is insufficient, the hardness is not good. This is a good measure, and it is tiring to be able to hold it.
After the completion of the manufacturing, it is also important to ensure the quality. Wipe it often with a cloth to keep it clean and avoid collisions to prevent damage. If it is placed outdoors, it is necessary to prevent rain from invading and hot sun exposure. In this way, the second layer can be kept new and retained for a long time.

In today's world, among the shops, the price of the two-winged bee beetle varies according to its quality, quantity, time and place, and it is difficult to determine a certain number.
Looking at its quality, if it is healthy and healthy, the color is in good shape, and it is collected in good soil and raised with good methods, the price will be higher than the usual one. On the contrary, if it is weak and flawed, or it is obtained in a bad state, and it is not suitable for nourishment, the price will be slightly lower.
As for its quantity, if you buy it in bulk, you will often get the benefit of more. If you only ask for a little, the retail price will be slightly higher every time you see it.
Changes in time are also related to the price. In the prime season of its production, the goods are abundant and the price is flat; when the production is scarce, the demand for more supply and less supply, the price will rise.
The distance of the land, the situation of supply and demand, also affect its price. In places where the origin is close and the supply is sufficient, the price is often low; in remote areas, the price must be high if you ask for more and it is difficult to supply.
Generally speaking, between the markets, the price of two-winged bee beetles per catty is low, and it can be expensive to tens of dollars. However, this is not an exact number, and it changes with various conditions. The state of market changes is impermanent, and the price is also impermanent. Businesspeople and seekers are all observing the situation and getting the right price.

The common synthesis methods of 2-% pentynyl acetic anhydride are various, and the following are described in detail:
First, the nucleophilic substitution method of alkynides. The alkynyl-containing negative ion is first prepared, and acetylene is reacted with sodium metal in liquid ammonia to obtain sodium acetylene. After that, the sodium acetylene is reacted with halogenated acetic anhydride, such as bromoacetic anhydride, in a suitable solvent (such as tetrahydrofuran). The reaction mechanism is that the alkynyl negative ion has strong nucleophilicity and can attack the carbonyl carbon of bromoacetic anhydride. The bromine ion leaves, and then 2-pentynyl acetic anhydride is obtained. This reaction condition requires anhydrous and oxygen-free to avoid side reactions. The oxygen in the cap water and air will react with the alkynide, resulting in a
Second, synthesized by esterification reaction. First, 2-pentynyl alcohol is reacted with acetic anhydride in the presence of a catalyst. The commonly used catalyst is concentrated sulfuric acid or p-toluenesulfonic acid. During the reaction, the hydroxyl group of 2-pentynyl alcohol and the acyl group of acetic anhydride undergo nucleophilic substitution, and the acetate leaves to form 2-pentynyl acetic anhydride and acetic acid. This reaction requires temperature control, and if the temperature is too high, it is easy to cause side reactions such as alcohol dehydration. Generally, it reacts between low temperature and room temperature, and the reaction process can be removed by a water separator, so that the equilibrium shifts to the right and the yield is improved.
Third, through the organometallic reagent method. Grignard reagents containing alkynyl groups can be prepared first, such as 2-pentynyl magnesium bromide, which is prepared by reacting 2-pentynyl bromide with magnesium chips in anhydrous ether. Then the Grignard reagent is reacted with acetic anhydride. The carbon-magnesium bond of the Grignard reagent has strong polarity, and the carbon terminal is rich in electrons. It attacks the carbonyl carbon of acetic anhydride. After hydrolysis, 2-pentynyl acetic anhydride is obtained. This process requires strict anhydrous requirements, because water will decompose the Grignard reagent, causing the reaction to fail. After the reaction is completed, it is hydrolyzed with dilute acid to precipitate the product.