Thiophene-3-carbaldehyde

"Tiangong Kaiwu" has written that there are many kinds of dogwood, among which dogwood has a wide range of uses. The main use of dogwood is in medicinal use. Its taste is sour and mild, and it belongs to the liver and kidney meridians. It has the effect of nourishing the liver and kidney, collecting astringency and removing it. It has good effects on dizziness and tinnitus caused by liver and kidney deficiency, waist and knee soreness, impotence and spermatozoa, frequent enuresis and urinary frequency, collapse and leakage, sweating collapse and thirst and other diseases. Doctors' prescriptions are often used, and they are good medicines for conditioning the body and healing diseases.
Secondly, dogwood also has a place in dietary therapy. The ancients often ate it, or stewed it to replenish soup, or made health tea. With its nourishing effect, the purpose of strengthening the body and recuperating qi and blood is achieved. The dogwood is stewed with mutton and eaten in winter, which can drive away cold and warm the body, nourish the liver and kidney, and is a health delicacy.
In addition, the dogwood is also valuable in garden ornamentation. Its trees are beautiful, the flowers are blooming in spring, and the red fruits are full in autumn, which is very ornamental. Often planted in courtyards and gardens, adding the charm of scenery, for people to enjoy, and pleasing to the eyes and ears.
From this perspective, the dogwood has a wide range of uses. Whether it is medicine, diet therapy, or garden ornamentation, it shows its unique value and occupies an important position in the life and production practice of the ancients.

A shell, that is, its physical nature is special. The body of a shell, with a shell of a shell, this shell is in the shape of a shell, the ground is hard, and the surface is slightly rational, like a natural shell, covering it, and it is the first barrier against the outside. Its color is mostly in the environment where it lives, or it is blue gray, or brown, and it is in the sediment or aquatic plants on the bottom of the water, and it is good for it.
The shape of the shell, different sizes, can be up to 10 inches or even a ruler, and there are also 10 inches. Its weight is different from the environment of the year, and it weighs 10 catties. Its limbs are short and powerful, and the limbs have claws. It can be used to crawl or climb on the bottom of the water.
Furthermore, the skin of the nail is smooth and rich, and under the nail, there may be mucus secretion. This mucus makes the nail swim more easily in water, and it can slip the muscles and reduce the friction caused by foreign objects. Its body can be stretched, and it is often active. The mouth is pointed, and the bite force is low.
In addition, the density of the nail is slightly higher than that of water, so it can sink to the bottom of the water, but it can also use its limbs to stroke and lungs, and it can float freely. Its swimming posture in the water is flat and alive, and its limbs are like the essence of water, shuttling through stones and aquatic plants. In other words, the rational nature of things, so that it can skillfully create the important environment of aquatic life, and gain a place in the natural world.

The molecular formula of methyl ether is $C_ {2} H_ {6} O $, and its structural formula is $CH_ {3} OCH_ {3} $, which belongs to ether compounds.
Looking at its physical properties, methyl ether is gaseous at room temperature and pressure, colorless and has a unique odor of ethers. Its boiling point is quite low, about $-24.9 ^ {\ circ} C $. Because there is only a weak van der Waals force between methyl ether molecules, it is difficult to have strong interactions to maintain molecular condensation, so it is easy to vaporize. Its melting point is also low, about $-138.5 ^ {\ circ} C $.
When it comes to chemistry, methyl ether is relatively stable. Its carbon-oxygen bond is quite strong, and high energy is required to break it. However, under specific conditions, it can also exhibit various chemical reactions.
First, methyl ether can react with oxygen. When methyl ether encounters an open flame or a hot topic, it can burn violently to generate carbon dioxide and water. The chemical equation for the reaction is: $2CH_ {3} OCH_ {3} + 9O_ {2}\ stackrel {ignited }{=\!=\!=} 4CO_ {2} + 6H_ {2} O $. This reaction can release a lot of heat, so methyl ether can be used as a fuel and has certain application prospects in the energy field. < Br >
Second, methyl ether can undergo a substitution reaction. Under appropriate catalyst and reaction conditions, the hydrogen atom in the methyl ether molecule can be replaced by other atoms or atomic groups. For example, under the action of a specific catalyst, methyl ether can undergo a substitution reaction with halogen elementals (such as chlorine) to form halogenated methyl ethers and other products.
Third, methyl ether can react with strong acids. The oxygen atom of methyl ether has a lone pair of electrons and can combine with hydrogen ions dissociated from strong acids to form a closed salt. This reaction can change the chemical properties of methyl ether and is also the basis for its participation in some organic synthesis reactions. Although methyl ether is stable, it can exhibit various chemical properties under suitable conditions, and has potential application value in many fields such as chemical industry and energy. It needs to be further explored and developed urgently.

In "Tiangong Kaiwu", arsenic is obtained by the sublimation of letter stones. Letter stones are arsenic sublimation ores. After heating and sublimation, its steam is condensed when cold, and then it becomes arsenic. The method is as follows:
Select pure letter stones, break them into small pieces, and place them in a special pottery kettle. The bottom of the kettle is tightly sealed to prevent deflation. The kettle is covered with a pottery cover, and the joints are tightly sealed with yellow mud, so that no leakage is made.
Under the kettle, heat slowly with a charcoal fire, and the firepower should be uniform and moderate. The letter stone is heated, and it gradually sublimates. Its gas rises, and when it is cold, the pottery cover condenses on the inner surface of the cover.
Wait until the letter stone is heated to a few times, remove the charcoal fire, and wait for the kettle and cover to cool. Open the lid carefully, you can see that there is white or yellowish arsenic attached to the lid, which is refined arsenic.
However, you need to be careful, arsenic is highly toxic, and when preparing, you must be well protected. Followers wear leather gloves in front of thick cloth clothes, and cover their mouths and noses with a damp cloth to prevent poisonous gas from entering the body. And the preparation place should be well ventilated and away from human settlements. If you eat it by mistake or inhale too much, your life is in danger. Although this preparation method can obtain arsenic, it is life-threatening. When operating, you must not ignore it or be careful.

When storing and transporting, pay attention to all things. When hiding, the first place is heavy. Choose a dry, cool and well-ventilated place to avoid moisture, high temperature and sun exposure. Because A's nature likes shade and dampness, it is easy to rot if it passes through the moisture, and if it overheats, it will hurt its quality.
The storage place should also be clean and free of filth to prevent the filth from infecting A's. And it needs to be stored in isolation, do not mix with other things, so as not to cause odor or chemical reaction, which will damage its efficacy.
When transporting, the packaging must be stable. Hold it in a solid utensil, and fill it with soft things to prevent shock, so as to prevent it from being damaged in the bumps of the road. If the nail is fragile, it is more necessary to be cautious, wrap it layer by layer, and place it properly.
Temperature and humidity need to be controlled on the way. Temperature and humidity control equipment can be prepared, according to the needs of the nail, to maintain the right temperature and humidity. If the journey is long, you should pay special attention, check the temperature and humidity changes often, and adjust it in a timely manner.
The escort should also know the nature of the nail. In case of unexpected situations, such as sudden changes in temperature and humidity, damaged packaging, etc., you can quickly take countermeasures. And avoid shipping with toxic and harmful things during transportation, and the armor is pure. In this way, pay careful attention to all things during storage and transportation, so that the quality of the nail can be protected and its efficacy will not be lost.