2-fluoro-5-iodopyridine

2-% E6% B0% 9F - 5-%E7%A2%98%E5%90%A1 its main use for irrigation of farmland and transportation.
In "Tiangong Kaiwu", water conservancy is related to people's livelihood. 2-Canal, the ditch for water in the field; 5-Canal, or the device for water diversion, or something related to the waterway.
As far as irrigation is concerned, 2-Canal can make the water flow reasonably distributed in the field. When farming, the growth of grain seedlings needs water to nourish, if there is no canal to guide the flow, water or flooding, or not, it is not conducive to farming. Canal with its reasonable diversion, so that the soil in the field can get water, and the crops can thrive. This is the foundation of clothing and food for all people.
As for transportation, although the 5-hu is not a huge vehicle like a boat, it can be used as an auxiliary transportation in places where waterways are vertically and horizontally. In shoals and small ports, the hu plays a unique role in civil transportation because of its lightness, which can carry people or carry some goods. In the water town of Zeguo, the function of the 5-hu for transportation or relying on waterways should not be underestimated. It either helps fishermen catch fish, or it is a means for villagers to travel to and from their neighbors, and occupies a place in the daily life and economic exchange of water towns.
Therefore, 2-5-Hu, which is related to the foundation of farming and irrigation, or the convenience of transportation, is of great significance to people's livelihood and social operation.

To make dicyanopentazole, there are various methods. Although "Tiangong Kaiwu" does not describe this substance in detail, the chemical method may be analogous to bypass.
First, it can be started from compounds containing cyanide groups. Cyanide is often toxic, but it is often an important raw material in chemical synthesis. For example, sodium cyanide, potassium cyanide, etc. react with appropriate halogenates or other active reagents to build a basic cyanide-containing skeleton.
Second, use cyclization reaction. In organic synthesis, cyclization is a key step in forming a cyclic structure. In order to obtain the five-membered ring structure of dicyanopentazole, a suitable chain-like precursor can be designed to undergo intra-molecular cyclization reaction under specific conditions, such as high temperature and catalyst, to construct the pentazole ring.
Third, the redox path. By adjusting the oxidation state of the reactants, the conversion of functional groups and the construction of the structure are realized. For example, some nitrogen heterocyclic compounds containing suitable substituents are oxidized or reduced to introduce cyano groups, and the electron cloud distribution on the ring is adjusted to promote the formation of the pentazole ring.
Fourth, the coordination catalysis method. A specific metal catalyst is selected, and the coordination between the metal and the reactants is used to guide the selective progress of the reaction. Metal catalysts can reduce the activation energy of the reaction, allowing the originally difficult reaction to proceed smoothly, and can improve the yield and purity of the target product.
However, it should be noted that dicyanopentazole may have special chemical activity and stability. During the synthesis process, the control of reaction conditions must be extremely precise, such as temperature, pressure, reaction time, and the proportion of reactants, which have a great impact on the formation of the final product. And some raw materials and reaction processes may pose safety risks, and chemical safety regulations should be strictly followed during operation to ensure the safety and success of the experiment.

2-% E6% B0% 9F and 5-%E7%A2%98%E5%90%A1 are both strange objects described in the Divine Work Kaiwu, and their physical properties are unique.
2-% E6% B0% 9F, the color is azure blue, like water in a deep pool, its quality is warm and moist, and it seems to touch the skin with a trace of coolness. Looking at its shape, it is a flowing liquid at room temperature, but its fluidity is different from that of ordinary water. It is slow and even, and seems to have its own rhythm. And its density is quite large, and the same volume is heavier than that of ordinary liquids. If it is heated by fire, it does not see its boiling evaporation, and it reflects a strange light. The blue light flickers, which is quite magnificent, and this light does not emit heat, which is really strange.
5-%E7%A2%98%E5%90%A1, the appearance is golden, as bright as the sun, the texture is hard as iron, and when you hit it, its sound is crisp and pleasant, and the residual sound is curling. Its shape is regular, mostly block-shaped, with distinct edges and corners. This object is extremely resistant to corrosion. It is placed in the wind and rain, and after years, it does not see the slightest rust. It is difficult to damage it with a heavy object. What is even more strange is that when placed in a magnetic field, it can generate a weak magnetic force. Although the force is small, it can also make small iron objects sense. Such physical properties are rare.
In terms of physical properties, one is a liquid state and the other is a solid state. Each has extraordinary characteristics. It is a strange product between heaven and earth, adding many mysterious colors to the world.

I have heard your inquiry about the market price of the five tunnels in the Two Gorges. I have read the description of "Tiangong Kaiwu". Although the price of this object is not directly stated, it can be deduced from the text.
The land of the Two Gorges is high in mountains and dense in forests, and the products are quite abundant. The five tunnels, or the like of mines, also have their value in the market. Think of the ancient times, the mines came out of the tunnels, mostly hardware or the like, or coal. Hardware is widely used, can be used for utensils, and can be used for coins, and its price is not cheap. If the five tunnels are produced of precious metals such as gold, silver, and copper, their market value is weighed by actuarial calculation. Gold is the most precious thing in the world, and its price is incomparably high. According to the supply and demand at that time, or one or two of them, it is worth dozens of dollars. Silver is second, and it is also currency. One or two, or it is worth several. Although copper is not as expensive as gold and silver, it is needed for coinage and utensils, and its price can also be seen. The price per catty, or hundreds of pennies.
As for coal, it was also gradually used at that time for cooking and heating needs. Its price is cheaper than hardware, but it also varies depending on the distance of the place of origin and the quality. Good coal near, or dozens of pennies per load; if the journey is long and the transshipment is difficult, the price may be doubled.
Also considering the land of the two gorges, the transportation may be inconvenient, and the output of the five tunnels will be transported to the city, and the cost will increase. And the output of the five tunnels is limited by many factors such as weather, geographical location, and manpower, and the output may fluctuate, which also affects its market value.
To sum up, the market value of the things in the two gorges and five tunnels depends on the category, quality, supply and demand, and difficulty of transshipment. It is difficult to generalize.

"Two baht and five collars," says the "Heavenly Works". "The so-called" two baht and five collars "are related to many exquisite systems.
Both" baht "and" collar "are units for measuring the weight of money or metal in ancient times." Baht "is lighter and smaller, while" collar "is slightly heavier. In terms of metallurgy and coinage at that time, in order to properly preserve this" two baht and five collars "object, there must be something special about the treasure.
First, the material must be the key. Or use a tough and corrosion-resistant metal, such as bronze. Bronze was widely used in ancient times, and its alloy properties made it not susceptible to oxidative erosion, which could protect the hidden "two baht five collars" for a long time. And bronze can be cast into various exquisite containers, with various shapes, or in the shape of a box to closely store it to prevent damage; or in the shape of a bottle can, which is convenient for storage.
Secondly, the sealing method cannot be ignored. In order to avoid external moisture, dust and other intrusion, the container must be tightly sealed. Or apply special clay or waxy material at the interface to fill the gap to achieve the effect of airtightness. In this way, it can prevent water vapor and oxygen in the air from contacting the "two baht five collars" and delay the process of its oxidative deterioration.
Furthermore, the design of the container may have a delicate mechanism. In terms of preventing theft or ensuring that items are in good condition, clever mechanisms can enhance their safety. If a hidden lock is installed, a unique key can be used to open it; or a mechanism is placed, and the touch will trigger a sound or other warning, making it difficult for those with bad intentions to easily obtain it.
The "two baht and five collars" treasure requires the delicate cooperation of materials, seals and designs to achieve the purpose of proper preservation, showing the delicacy of the ancient wisdom and skills.