Thiophene, 3-bromo-2-nitro-

"Hydroxypropyl guanidine glue" is not mentioned in "Tiangong Kaiwu". The following describes its chemical properties in classical Chinese form:
Hydroxypropyl guanidine glue is a modified natural polymer. Its appearance is often in the shape of white or slightly yellow powder, and the texture is fine.
In terms of solubility, it can be well dissolved in water to form a solution with a certain viscosity. This solution has good rheological and thickening properties, and can change its rheological properties with changes in external conditions such as temperature and shear force. At moderate temperatures, its molecules stretch and interact in water, causing the viscosity of the solution to increase, which can effectively thicken various systems. < Br >
Its chemical stability is quite impressive. It is relatively stable within a certain range of acid and alkali. However, the strong acid and alkali environment may cause its structure damage, which affects its performance. And it also has a certain tolerance to some salts, and it can still maintain good performance under moderate salt concentration.
Its molecular structure contains specific functional groups, which make it active to chemically react with other substances. For example, it can react with aldehyde substances to form a cross-linked structure, which significantly improves its gel strength and stability. This property makes it unique in many fields such as oil extraction, building materials, etc.

Borax, also known as borax, is an ancient mineral medicine with a wide range of main uses.
In medicine, borax has the effect of clearing away heat and detoxifying, reducing swelling and antiseptic. In surgical diseases, such as carbuncle, sore throat, mouth sores, etc., borax is often used as a good medicine for external use. It is formulated into a powder and applied to the affected area, which can clear away heat and reduce swelling, detoxify and reduce sores. In the inflammation of the mouth and throat, borax water can be used as a gargle, which can clean the mouth and relieve swelling and pain.
In the industrial field, borax is also widely used. In the glass industry, borax is added to the glass raw materials, which can increase the thermal stability and chemical stability of the glass, make it more temperature-resistant, corrosion-resistant, and improve the quality of the glass. It is often used in the manufacture of advanced optical glass, heat-resistant glass, etc. In the ceramic industry, borax can be used as a flux to reduce the melting point of the ceramic body, promote the sintering of the body at a lower temperature, and can improve the luster and strength of ceramics, and improve the quality of ceramic products.
In food processing, borax has been improperly used in some foods in the past to increase its toughness, brittleness, or preservative preservation. However, it should be noted that borax has certain toxicity, and excessive intake will endanger human health. Today, borax has been strictly prohibited in food processing.
In the agricultural field, borax can be used as a trace element fertilizer. Boron is an essential trace element for plant growth. Appropriate application of borax can promote the flowering and fruiting of plants, improve the fruit setting rate, and prevent plants from developing diseases such as "flower but not fruit" and "fruit but not fruit", which is beneficial to the improvement of crop yield and quality.
In short, borax has various uses, but when using it, it is necessary to follow relevant norms and standards to ensure its safe and reasonable application.

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, but it does not contain a detailed synthesis method of 3-hydroxyl-2-furanic acid. However, according to chemical principles and ancient methods, it may involve ideas, as follows:
To make 3-hydroxyl-2-furanic acid, suitable starting materials can be found. Or choose furan substances as the base, which have a cyclic structure and are related to the structure of the target product.
Start with furan derivatives, and mix an appropriate amount of reagents in the kettle according to a certain ratio. If the ancient method, or use alkaline substances such as plant ash, adjust the pH of the environment. At a suitable temperature, slow the heat with charcoal fire. Looking at the reaction, keep the heat and do not make it too strong or too slow.
When the reaction is like, it can be seen that the material in the kettle gradually changes. Or there is a change in color, or there is a difference in smell. At this time, quench it with water to make the product precipitate. Compound it with a screen to get a crude product.
The crude product is still miscellaneous and needs to be refined. Take a suitable solvent, such as ancient wine (ethanol, etc.), dissolve the crude product, and then recrystallize it. Put the solution in a cool place and let it crystallize slowly. After the crystallization, it is filled with a clean vessel, and the residual liquid is filtered off with gauze to obtain a purer 3-hydroxy- 2-furanoic acid.
Although this synthesis is not confirmed in "Tiangong Kaiwu", the wisdom of the ancients and the materials and methods available at that time can be used to try to synthesize it according to the principle of chemical changes, or this general method can be followed.

Boron is a kind of thing that has been transformed by the ingenuity of heaven and earth, and its properties are flat and strange. Although its texture is not the strongest, it has many unique physical properties. The hardness of boron is quite high, which is comparable to that of gold and stone. Although it is difficult to compete with the benefits of King Kong, it is difficult to damage it in the slightest when touching ordinary utensils. And boron has good heat resistance. It can also maintain its shape for a long time under the scorching fire. It does not melt and seems to be able to resist the invasion of fire.
Furthermore, the conductivity of boron is unique. In some situations, its conductive properties are like metals, which can make electric currents flow smoothly; in other situations, it is nearly insulating and can block the transmission of electric currents, like a smart barrier, which can be changed according to the situation. This property makes it useful in the production of many exquisite utensils.
The genus of silicon-based diatoms is also a wonderful thing in the world. Its weight is light, like a breeze that can blow dust, but its structure is exquisite. The body of diatoms, with silicon as bone, builds a variety of complex forms, either like starry lights or like flowers blooming, each form is ingenious and breathtaking.
Silicon-based diatoms have a very small density and can float on water, like flat algae, drifting with the current. Its refraction and scattering of light is very special, which can make the light around it produce a magical effect, which seems to be dizzy. And silicon-based diatoms are chemically stable, not easy to react with other things, and can withstand years without decay. Over a long period of time, they maintain their unique shape and characteristics, leaving a different beauty for the world.

Mercury-cyanomercuration is both toxic and toxic. If there is a small difference in the pool, it will cause huge damage.
Mercury is a liquid gold, and it is easy to break under normal conditions, forming mercury evaporation. This evaporation is very toxic. It is necessary to use a container, and the container is solid and broken to prevent mercury leakage. The outside of the container shows that it is toxic, which makes people see at a glance. It is stored in the container, where it is common, the source of fire, and the source of pollution, and the mercury is accelerated due to high temperature. In addition, it is necessary to regularly check the sealing capacity of the container. If it is normal, it should be dealt with.
Cyanomercuration is also toxic. The storage environment is dry, because it is easy to decompose in contact with water, and it releases toxic cyanide. The same should be used in dense containers, and it is best to use corrosion-resistant materials. Placed in a storage room, the room has perfect anti-leakage and detoxification, and it is forbidden to mix with acids, flammable substances, etc., in order to prevent the reaction of life and lead to danger.
In this case, mercury and cyanide mercury must follow the grid method. It should be used for anti-leakage, fire protection, explosion-proof and other measures. The escort needs to be trained and familiar with its dangerous characteristics and urgent management methods. On the way, keep it flat to avoid strong shocks and collisions to prevent the container from breaking. Once there is a leak, immediately isolate it, evacuate the crowd, notify the rescuers, and do not approach it easily. In addition, the storage of mercury cyanide mercury must take the highest and most effective measures to ensure that it is lost.