2 Trifluoromethyl 1 Iodo 4 Nitrobenzene

"Tiangong Kaiwu" says: "Where the ostrich grass is near the water, it is like a reed, and its quality is solid." The main uses of ostrich grass are quite extensive.
One of them can be used for papermaking. The fibers of ostrich grass are slender and tough, and it is a good material for papermaking. In the ancient papermaking technique, after multiple processes, the paper obtained from the treatment of ostrich grass has fine fibers and good toughness, which can be used for writing and printing. For example, many ancient books, documents, or those recorded with paper made of ostrich grass in the past have made great contributions to cultural inheritance.
Second, it can be used as fuel. Ostrich grass is flammable. In ancient times, people made fires to cook and heat, and ostrich grass was often the choice of firewood. In places where there is a shortage of coal and less charcoal, ostrich is widely distributed, which is convenient to obtain, provides heat energy for daily life, and guarantees the basic needs of the people.
Third, it is used for weaving. The stems and stems of ostrich are flexible, and they can be woven by hand to form baskets, mats and other things. This kind of weaving is not only practical, but also has certain aesthetics. In farmers, baskets can hold things, and mats can make beds. It contributes a lot to the convenience of daily life.
Fourth, it is also useful in agriculture. After the ostrich is harvested, it can be composted and returned to the field to fertilize the soil, improve the soil fertility, and is conducive to the growth of crops. And the ostrich that grows by the water can stabilize the embankment, prevent floods and protect the soil, which is of great significance to ecology and agricultural production.
All these, it can be seen that although Dictych is an ordinary plant, it has a wide range of uses and has a profound impact on the production and life of the ancients.

According to "Tiangong Kaiwu", the triangular methyl is a rare wonder in the world. Its nature is strange, with many wonders, and it is comparable to ordinary things.
The triangular methyl is hard in quality, like the strength of gold and stone. Although it has been honed over time and eroded by wind and rain, it is difficult to damage it at all. And its weight is moderate, holding it in the hand, it has a sense of calmness, not like a frivolous thing, erratic.
Furthermore, the texture of this object is uniform, and when viewed on its surface, it is as smooth as a mirror, without the slightest flaw. Caressing it with your hand, it is delicate and warm, like suet white jade, giving people an excellent touch.
Its color is unique, not red or yellow, not blue or white, but between several colors, with a faint brilliance flowing, just like the rays of the sky, magnificent and mysterious, making people forget the world.
As for tetracarboxylnaphthalene, it is also a rare treasure in the world. Its nature is warm and gentle, not like the dryness of fire, nor the cold of ice, and it is in the middle way.
The texture of tetracarboxylnaphthalene is flexible, flexible and extensible. Although it is pulled by external force, it is not easy to break. It is like a tough vine that can withstand certain pressure. Its color is elegant and plain, or white like autumn frost, or green like spring grass, giving people a sense of tranquility and peace.
And there is something strange about this substance. It is placed in a specific environment and can echo with the things around it. It is as if it has spirituality, which is the magic of creation.
Triangular methyl and tetracarboxylnaphthalene are both spiritual things between heaven and earth. Their physical properties are unique, either strong or soft, or light or light, adding many wonderful colors to the world, which makes people sigh at the wonders of nature.

Triethylamine, also known as triethylamine, is a common organic compound. It is a colorless to light yellow transparent liquid with a strong ammonia odor, miscible with ethanol and ether, and soluble in water.
Triethylamine is weakly basic and can react with acids to form salts. In the field of organic synthesis, this substance is often used as an acid binding agent to promote the reaction in a positive direction by combining with the acid generated by the reaction. For example, in esterification reactions, triethylamine can be combined with the resulting carboxylic acid to prevent reverse reactions and increase the yield of esters.
In pharmaceutical chemistry, triethylamine is often used to catalyze reactions, such as the formation of amide bonds. Due to its weak alkalinity, it can promote the attack of the nucleophilic test agent on the carbonyl group and help the smooth development of the reaction.
In industrial production, triethylamine is often used in the preparation of dyes, rubber accelerators, etc. For example, in some dye synthesis steps, triethylamine can be used as a reaction aid to regulate the pH of the reaction and optimize the reaction conditions.
It is worth mentioning that triethylamine is volatile and irritating, and safety protection should be paid attention to during use. When storing, it should be placed in a cool and ventilated place, away from fire and heat sources to prevent danger. In short, triethylamine, as an important organic compound, plays an indispensable role in many fields due to its unique chemical properties.

To make tetracyanosilicate, the following methods can be followed.
First, a silicon halide is prepared with cyanide. Silicon halide such as silicon tetrachloride is active and can react with potassium cyanide and other cyanides in a suitable solvent. In a closed and dry container, using anhydrous ether as a solvent, silicon tetrachloride is slowly dripped into the ether solution of potassium cyanide, during which the temperature should be controlled moderately, not too high to avoid side reactions. The principle of this reaction is that the halogen atom is replaced by a cyanyl group, through which tetracyanosilane can be obtained. However, this process needs to pay attention to the toxicity of cyanide, and the operation must be cautious. It must be well ventilated and well-prepared.
Second, silane derivatives should be used as the starting material. Select a suitable silane, such as an alkyl silane, first through a halogenation reaction, so that the silicon atoms are connected to halogen atoms, and then replace the halogen atoms with cyanyl groups. First, the silane is reacted with an appropriate amount of halogen under light or catalyst to generate halogenated silane. Then the halogenated silane is reacted with a cyanide reagent, such as sodium cyanide, in a polar solvent. This process also requires fine regulation of the reaction conditions. Temperature and the proportion of reactants are key to increase the purity and yield of the product.
Third, the ore or compound containing silicon is used as the starting material. After pretreatment, the silicon is converted into a more reactive form, such as a sodium silicate solution. After a series of reactions, cyano groups are introduced. Sodium silicate can be acidified to obtain silicic acid first, and then it can be reacted with cyanide-containing reagents. However, there are many steps in this way, and the reaction of each step needs to be controlled in detail. Removal of impurities and refining are also crucial to obtain pure tetracyano silicon.

When storing and transporting Poria cocos, many matters need to be paid careful attention to.
When storing, the first priority is to prevent moisture. Poria cocos have strong water absorption. If they are in a humid environment, they are very susceptible to moisture and mildew, resulting in a significant drop in their quality. Therefore, they should be stored in a dry and well-ventilated place, or properly wrapped with moisture-proof packaging materials. "Tiangong Kaiwu" says: "The storage of things is to avoid moisture." As in the past, pharmacies store Poria cocos, often choosing high-drying pavilions, and placing desiccants such as lime next to them to prevent moisture erosion.
Insect control is also indispensable. Poria cocos are rich in nutrients and easy to attract insects. You can store prickly ash, asarum and other natural substances with insect repellent effect in the storage place, or dry them regularly to use the power of sunlight to repel insects. In ancient times, there was a method of storing Poria cocos and prickly ash. The smell of prickly ash is pungent, and insects are avoided to keep Poria cocos from being insect-eaten.
Furthermore, pressure prevention is quite critical. The texture of Poria cocos is relatively brittle, and it is easy to break under heavy pressure, which affects its appearance and efficacy. When stacking, avoid stacking too high, and do not place heavy objects on it.
When transporting, check the road conditions. If the road is rough and bumpy, Poria cocos are easily damaged, so a smooth transportation route should be selected. The means of transportation are also particular, and should be clean, dry, and odor-free to avoid contamination or odor of Poria cocos In the past, land transportation was mostly carried by mules and horses. In order to prevent the Poria from being bumped and broken, it was wrapped in soft grass, cotton cloth, etc.; in water transportation, the Poria was placed in a dry cabin to avoid contact with water.
Temperature and humidity also need to be controlled. High temperature can easily cause the Poria to deteriorate, and high humidity increases the risk of mildew. Appropriate temperature control and dehumidification measures should be taken during transportation to ensure the quality of the Poria.