2-(2-Pyridyl)thiophene

In "Tiangong Kaiwu", "2 - (2 - to its base) calcined ash" involves this object, which has many main uses.
For construction purposes, this calcined ash is the key material for construction. When building a wall, it is reasonably mixed with sand, water, etc. into mortar, and its bonding performance is very good, which can make the bricks closely connected, making the wall strong and abnormal, and it will not fall down after years of wind and rain. For example, many ancient city walls, ancient temples and other buildings have been preserved to this day with their strength, witnessing the changes of the years.
In the field of agriculture, it also has important functions. Appropriate application to farmland can adjust soil pH. If the soil is too acidic, it can react with it, improve the soil quality, and create a suitable environment for crop growth. And it can add nutrients such as calcium to the soil, help crops thrive, and improve yield and quality.
is effective in anti-corrosion. In ancient times, it was often used to bury corpses or smear it on the surface of perishable wood. Because it can absorb water, keep the environment dry, inhibit the growth of microorganisms such as bacteria, thereby delaying the rate of decay of objects and making items last longer.
In metallurgical and other industries, it is also indispensable. In the process of smelting metals, adding this calcined ash can react with impurities in the ore to form slag, which can then separate pure metals and improve the purity of metals, which is of great significance to the development of metallurgical processes.

2 - (2 - to its base) The physical properties of mercury generally have the following ends:
Mercury, which is an alloy of mercury and other gold. Its physical properties are the first to be melted. Because the melting temperature of mercury is low, -38.87 ° C, it forms mercury in other gold, and the melting temperature is usually low in the original gold. If mercury is low, its melting temperature will be lower than that of mercury. This property is very useful in some metallurgical and chemical processes, which can make the reaction at low temperatures, save energy and reduce the requirements of the reaction container.
Furthermore, the hardness of mercury is also reduced. Generally speaking, the hardness of mercury is different from that of its gold formation. For example, the hardness of mercury is neither the hardness nor the softness of mercury, but between the two, and it depends on the proportion of mercury. The hardness of this material allows mercury to be used in the fabrication of special materials, and its hardness can be determined according to demand. It can be used in fields such as chemical materials, which can not only maintain a certain degree of hardness, but also have a certain degree of plasticity.
Its performance is also an important physical property. Mercury itself is good, so it forms mercury, and its performance can be changed by the addition of other gold. The performance of some mercury may be reduced due to alloying efficiency, and some may maintain similar performance due to special properties. This property needs to be taken into account in the research of electronic devices and materials.
In addition, the color of mercury is also different. Mercury is often white gold, and other gold forms mercury, and the color may be changed due to the color and content of other gold. If some mercury may show a partial or grayish color, this will have a certain impact on its appearance and beauty. This factor needs to be taken into account in the application of materials and so on.

Therefore, the physical rationality of mercury depends on the proportion and proportion of gold, and its many characteristics make it have important uses in many industries.

To prepare 2 - (2 - alkynyl) aldehyde compounds, there are many synthesis methods, which can be explored from the following aspects under the inspiration of "Tiangong Kaiji".
First, alkyne is used as the starting material and is nucleophilic addition reaction. For example, alkyne can be hydroformylated with carbon monoxide and hydrogen under specific catalysts and suitable reaction conditions. This reaction requires the selection of high-efficiency catalysts, such as some transition metal complexes, such as cobalt, rhodium and other metals. The reaction temperature and pressure are also crucial. The temperature may be controlled at tens to hundreds of degrees Celsius, and the pressure may be several tens of megapascals. Only then can alkynes react effectively with carbon monoxide and hydrogen to generate the target 2 - (2 - alkynyl) aldehyde.
Second, it can be obtained by reacting halogenated alkynes with metal-organic reagents, and then through the oxidation step. First, the halogenated alkynes are reacted with metal-organic reagents such as Grignard's reagent and lithium reagent to form a new carbon-carbon bond to form an alkynyl-substituted intermediate. Subsequently, the intermediate is oxidized to an aldehyde group using suitable oxidizing agents, such as manganese dioxide and Jones's reagent. In this process, the preparation of metal-organic reagents requires an anhydrous and oxygen-free environment to ensure their activity, and the oxidation step also needs to precisely control the reaction conditions to avoid excessive oxidation.
Third, the condensation reaction between alkynes and aldoxides is also a feasible method. Under the catalysis of alkynes and aldoxides, a condensation reaction occurs to form alkynyl alcohol intermediates, which can be converted into 2- (2-alkynyl) aldoxides by selective oxidation. The type and dosage of bases, reaction temperature and time all have a significant impact on the reaction process. Appropriate bases, such as potassium carbonate, potassium tert-butyl alcohol, etc., should be selected to control the reaction conditions and make the reaction proceed in the direction of generating the target product.
In short, the synthesis of 2- (2-alkynyl) aldehyde compounds can be flexibly selected according to actual conditions and needs, and the reaction conditions can be carefully adjusted to achieve the purpose of efficient synthesis.

Now there are two- (two- to its base) iridium in the city, what is the price? This question concerns the price of the market change. To understand it, we should consider all the reasons.
Those in the city, supply and demand are necessary. If there are many things in the world that need iridium (two- to its base), and those who supply it are few, the price will be high. Everyone strives for it, and what is rare is precious, and the price is high. For example, if people are chasing it, how can the price not be high?
On the contrary, if there is no great need for this thing in the world, and the products are abundant and full of the market, the price will be low. The common earth and stone are found everywhere. Although the quantity is large and the user is small, the price is also low.
The price of the market is also affected by the time and place. When the time is different, the needs of the goods are different. When the place is different, the abundance of the goods is different. If at one time and place, di- (di- to its base) iridium is urgently needed, and the production here is less, the price must be high. If the weather changes, a certain use is suddenly urgently needed, and its price rises immediately. Or in a remote place, where the goods are scarce and foreign goods are difficult to come to, that is, ordinary goods, the price is also higher than elsewhere.
Furthermore, labor costs are also an element of pricing. If it is labor-intensive and requires fine materials to make this thing, its price must not be high. Take a carefully crafted utensil as an example. The craftsman is dedicated to thinking about it, and the consumables are also precious. How can its price be the same as that of ordinary products?
And the profit of the merchant also affects its price. Merchants seek profits and set prices according to the state of the market. If you estimate that this thing can be profitable, you must increase its price. However, you also need to consider the buyer's ability to accept it. If it is too high, no one will care about it, and you will lose your profits.
To sum up, it is difficult to determine the market price of di- (di- to its base) iridium, and it is necessary to carefully examine supply and demand, time and place, labor costs, business planning, etc., in order to obtain its approximate price.

In the land of China, there are many people who have made outstanding achievements in the production and manufacturing of "two - (two - to its foundation) ".
First of all, Lu Ban, who was the skilled craftsman of Lu during the Spring and Autumn Period, was respected as the originator of civil construction and the originator of carpenters. Lu Ban was ingenious and created many practical utensils. Such as the ruban ruler, when the building was built, it was accurately measured to make the house orderly; and like the saw, which was inspired by the cutting of fingers by grass leaves, which greatly improved the efficiency of wood cutting and had a profound impact on the development of the construction and woodworking industries. Its exquisite skills and innovative thinking made future craftsmen worship and compete to follow suit.
Let me mention Ou Yizi again, he was a master of swordsmithing from the late Spring and Autumn Period to the early Warring States Period. In a place like "Er- (Er- Xiangqi) ", he dedicated his efforts to forging a world-famous sword. Longquan sword is incomparably sharp and hard and soft. The sword body is beautifully decorated, and has both practical and artistic value. Ou Yizi's swordsmithing has unique insights into material selection, heat control, and forging process. His swordsmithing method has laid a solid foundation for the casting industry in later generations. Many famous swordsmiths are influenced by his techniques.
There is Huang Daopo, a cotton textile innovator in the late Song and early Yuan Dynasties. She studied hard in specific places and revolutionized cotton textile technology. Improve the ginning wheel to make the separation of cottonseeds more efficient; improve the bow of elastic cotton to increase its size and improve the quality of elastic cotton; create a three-spindle pedal spinning wheel to greatly improve spinning efficiency. Zodiac's contribution has made the cotton textile industry flourish, changed the situation of people's clothing, and promoted the textile industry to a new height.