Pyrrolidine (Tetrahydropyrrole)

What I'm asking about is about the main use of Xiangyu (tetrahydrogenation). Xiangyu, although the various things involved in "Tiangong Kaiwu" are not detailed, as far as this world knows, its use is quite important.
First, it has its use in the field of medicine. In the preparation of various medicines, Xiangyu can be used as a key ingredient. Its mild nature, or has the effect of regulating the viscera, relieving the muscles and activating the collaterals. Doctors use it as a guide, or supplemented with other medicines, to prepare prescriptions to cure many diseases. Such as poor qi and blood, joint arthralgia, Xiangyu can be used as medicine to help the medicinal power to access and relieve the suffering of patients.
Second, in the chemical industry, Xiangyu is also indispensable. In the production of some fine chemical products, Xiangyu can be used as a catalyst or reaction intermediate. Because of its special chemical structure, it can promote the progress of specific chemical reactions and improve the purity and yield of products. Such as the synthesis of high-end fragrances, special polymers, etc., Xiangyu's participation can make the production process more efficient and the product quality is better.
Third, in the process of scientific research and exploration, Xiangyu is an important research object. Scholars use it as a sample to explore the microstructure and reaction mechanism of substances. Through in-depth research on Xiangyu, it may open up new scientific fields, reveal the mysteries of nature, and provide a theoretical basis for the progress of science and technology. For example, in materials science, the study of the characteristics of the grain may lead to the birth of new functional materials.
Fourth, in a specific agricultural production process, the grain may have auxiliary functions. Some of its derivatives may be used as plant growth regulators to regulate the growth cycle of crops and enhance the resistance of crops. Make crops in the face of drought, diseases and pests and other adversity, can still maintain a good growth situation, thereby improving the yield and quality of crops.

Tetraammonium copper (II) ion, that is, copper ammonia ion, has the following physical properties:
This ion is usually dark blue in solution, and the color is quite bright, like a deep pool, which attracts attention. When copper ions and ammonia molecules are complexed in a specific ratio to form the ion, its stability in aqueous solution is significantly improved. Under normal temperature and pressure, this ion can exist relatively stably in aqueous solution systems.
Looking at its solubility, many compounds composed of copper ammonia ions often have good solubility in water. This is due to the coordination of ammonia molecules, which greatly changes the original properties of copper ions, making it easier to interact with water molecules and then dissolve. For example, the copper-ammonia complex formed by the reaction of the common copper sulfate solution with excess ammonia water can be well dissolved in water to form a clear and transparent dark blue solution.
When it comes to density, because copper-ammonia ions mostly exist in the solution system, their density is closely related to the solution where they are located, and will change with factors such as solute concentration and temperature in the solution. Generally speaking, the density of copper-containing ammonia ion solutions will increase compared with pure water. This is because the relative molecular weight of copper-ammonia ions and related ligands is large, which increases the mass of the substance per unit volume.
Furthermore, copper-ammonia ion solutions have certain conductivity. After the ammonia molecule is complexed with copper ions, the ions can move freely in the solution and form an electric current under the action of an electric field, but their conductivity is closely related to factors such as the concentration of ions in the solution and the number of charges carried by the ions.
In addition, copper ammonia ions also have certain optical properties. Under the irradiation of a specific wavelength of light, an absorption spectrum will be generated, which is often used in analytical chemistry for qualitative and quantitative analysis. By measuring and analyzing the absorption spectrum, the concentration of copper ammonia ions in the solution can be accurately known.

Vanadium pentoxide, with its yellow color and strong properties, is unique in various chemical characteristics.
Vanadium, the symbol of the chemical element is V, and vanadium pentoxide is its important oxide. Under normal conditions, this product is orange yellow to brick red powder. On a microscopic scale, the powder is uniform and delicate. Its melting point is quite high, reaching 1970 ° C, just like the god that has been tempered and not afraid of high temperature, it can still maintain its shape in the heat. The boiling point should not be underestimated, and it will turn into a gaseous state at about 3000 ° C. This extraordinary heat resistance makes vanadium pentoxide a key position in many industrial processes in high temperature environments.
When it comes to solubility, vanadium pentoxide can be said to have distinct characteristics. It is insoluble in water, just like a foreign body that is incompatible with water. It stands in water and is difficult to blend with water. However, it is soluble in acids, just like meeting a friend, it quickly reacts with acids to generate corresponding vanadates. Not only that, vanadium pentoxide can also dissolve in bases, and when it meets bases, it will produce a series of wonderful chemical changes and form different compounds.
Vanadium pentoxide has significant oxidation and often acts as an oxidizing agent in chemical reactions. In many redox reactions, it increases the valence of other substances by virtue of its own oxidation, and itself is reduced accordingly. This oxidizing property is very useful in many fields such as organic synthesis, and helps to generate various important organic compounds.
In addition, the toxicity of vanadium pentoxide should not be underestimated. If the human body is inadvertently exposed or inhaled, it will cause harm to health. Therefore, when handling vanadium pentoxide, it is necessary to be cautious and take comprehensive protective measures to prevent it from causing damage to the human body.
Overall, vanadium pentoxide, with its unique chemical properties, plays an indispensable role in many fields such as industry and scientific research. It is a wonderful and important substance in the chemical world.

I have heard you ask what should be paid attention to during storage and transportation. This is a practical question, which is related to the survival of living beings and must not be ignored.
Xiangyu is delicate by nature, and when it is stored, it is the first to live in the environment. It is suitable to live in a dry, ventilated and quiet place, and avoid humidity, muggy and noisy. If the environment is humid, it is prone to diseases, which will damage its health; sultry air will also make it uncomfortable, or cause heat stroke. And noisy sounds disturb its mind, make it restless, and are unfavorable to growth and reproduction.
As for the temperature, it should be maintained at a moderate degree. Cold is easy to stiffen, hot is easy to be impatient. In winter, you need to prepare warm things, such as soft hay and warm cotton wool, to help it resist the cold; in summer, you need to set up ventilation and cooling methods, such as placing a cool place, or using a fan to blow slowly, so that the temperature is appropriate.
When transporting, make sure the vehicle is stable. When you are timid, the road is bumpy, which often causes them to be frightened, which in turn affects their physiological functions. Inside the vehicle, you should also lay soft things, such as sponges and thick cloth, to reduce the feeling of vibration. And the space needs to be spacious and moderate, neither cramped, making it impossible to stretch; nor empty, so that they have nothing to rely on when driving, adding to panic.
Furthermore, the transportation time should be shortened. It is difficult to tolerate long-distance fatigue. If you are trapped in a vehicle for a long time, your diet and rest will be affected, and your physique will easily deteriorate. Therefore, it is the top priority to plan your itinerary, choose a fast track, avoid congested roads, and reach your destination quickly.
You should also not forget to take care of your diet on the way. Prepare appropriate amounts of your favorite foods, such as insects, fruits and vegetables, feed them in a timely manner, and provide clean drinking water to protect your physical strength. However, you should not feed them too much, lest they vomit in the bumps and pollute the place where they are located.
To sum up, when storing and transporting your car, you need to pay careful attention to the environment, temperature, vehicle, itinerary, and diet. In this way, you can ensure a smooth and healthy journey.

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty. However, it does not contain the method of making preserved ducks (four ducks to ducks) in detail. I will describe this method of making preserved ducks in ancient Chinese.
If you want to make preserved ducks, the first choice is the strong and sturdy Xiangduck. This duck needs to have bright fur, bright eyes, a strong posture, and a steady walk. After choosing, cut off its throat with a sharp knife, and drain the blood. When the blood is exhausted, put the duck in hot water, and the water temperature should be moderate. If it is too hot, the hair will easily damage the skin, and if it is too cold, the hair will be difficult to fade. Floss its hair lightly with your hands, and be sure to remove the hair and clean it without leaving any hair.
Then, cut into the abdomen to remove its internal organs. In the internal organs, the intestines, stomach and other filth should be discarded, and the liver and heart can be used for other purposes. Wash the duck body, both inside and outside need to be clean, and wipe the duck body with salt. The amount of salt should be moderate, too little will be difficult to prevent corrosion, and too much will taste salty and lose freshness. Rub the salt, put the duck in a pottery urn, seal the mouth of the urn, let it stand in a cool and dry place, and marinate for a few days.
After a few days, take out the pickled duck, rinse it with water to remove any excess salt. Then, put a string through the neck of the duck, hang it in a ventilated place, and let it dry naturally. When drying, it is necessary to prevent flies from biting and avoid rain. When the duck body is semi-dry, take pepper, star anise, cinnamon and other spices, grind them into powder, and apply them evenly to the duck body. Hang the duck in a ventilated place and continue to air dry until the duck body is completely dry and the meat is firm.
At this point, the preserved duck is first formed. When you want to eat, you can steam the preserved duck in a retort, wait for it to be cooked, take out slices, and serve it with fine wine. The taste is mellow and the aroma is overflowing. It is really delicious in the world.