Pyridine 2 Bromo 6 Iodo

"The chemical name of this product is' 2-Hydroxy-6-Chloropyridine '. In this name,' 2-Hydroxy 'indicates that the hydroxyl group is connected to the No. 2 position of the pyridine ring. The hydroxyl group is an extremely important functional group in organic compounds. It endows the compound with specific chemical activities and physical properties. For example, it can participate in many chemical reactions, such as esterification reactions, and can enhance the polarity of molecules and affect the solubility of substances.' 6-Chlorine 'means that there is a chlorine atom at the 6th position of the pyridine ring. The chlorine atom is also an atom with unique chemical properties. Its electronegativity is large, which will change the distribution of the electron cloud of the molecule where it is located, affecting the stability and reactivity of the molecule. For example, it may promote nucleophilic substitution reactions to occur more easily. The pyridine ring itself is an aromatic nitrogen-containing heterocyclic compound. Its unique cyclic structure and nitrogen atom endow the whole molecule with a certain alkalinity and a special electron conjugation system. The entire '2-hydroxy- 6-chloropyridine 'name accurately determines the position of each atom and functional group on the pyridine ring, allowing chemists to clearly know the structure of the compound, and then predict its chemical properties and possible chemical reactions. This naming follows the chemical substance naming rules, providing an accurate and unified identification for the communication, research, and development and application of related products in the field of chemistry, allowing different regions and researchers to conduct in-depth discussions and practices on the substance based on this name. "

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, which is detailed in many fields such as process technology and agriculture. As far as "2-tank-6-kettle" is concerned, the tank and kettle are of great significance in many process links involved in the book.
In the art of salt making, the tank is often the place where brine is stored and transported. The brine is drawn from the salt well and injected into the tank first to precipitate impurities and make the brine purer. The kettle is the key salt cooking utensil. The precipitated brine is scooped into the kettle, heated with firewood as fuel, water vapor evaporates, and the salt gradually resolves, eventually obtaining salt crystals. In this process, the tank ensures the cleanliness and order of the brine, and the kettle realizes the crystallization of the salt. The two complement each other to ensure the smooth progress of the salt making process.
In metallurgy, the tank can be used to hold the flux required for smelting, or as a container for cooling metals. When the metal ore is smelted into a liquid state at high temperature, some metals need to be rapidly cooled and formed in a specific container, and the tank can play this role. The kettle may also have the function of auxiliary heating and refining in metallurgy. Some metals need to be refined many times to remove impurities. The kettle provides a space for refining, and the purity of the metal can be improved by controlling the temperature and adding suitable agents.
Looking at the brewing process, the tank can be used for soaking and preliminary fermentation of fermentation raw materials. Grains and other raw materials are placed in a tank and soaked in water for a certain period of time to promote the initial decomposition of their starch. The kettle plays a role in the subsequent cooking steps, steaming the fermentation raw materials to create conditions for the growth and fermentation of microorganisms. After cooking, fermentation, aging and other processes are carried out, resulting in fine wine and wine. In short, among the many processes recorded in "Tiangong Kaiwu", "2-tank-6-kettle" is a key instrument to ensure the orderly development of the production process, the transformation of raw materials and the output of products, and has a profound impact on the development of ancient processes and technologies.

Is the nature of 2-%-6-alkali-based matter rational? The two of these are the same in the "Tiangong", and let me explain them one by one.

The taste is mostly found in seawater, wells, etc. Its color is often white, and it is often white on the ground or like powder, or it is crystalline into grains. Its nature is easily soluble in water and placed in the air. If the temperature is high, it is easy to deliquescent. In ancient times, the method of making water was to boil the sea, boil the well, boil the water, etc. In the sea, seawater is introduced into the field, and it is exposed for many days. The water is steamed, and the crystals are precipitated. The well is taken from the well and boiled over fire, so that the water is lost.
Alkali is smooth and slippery, and its color is often white. Alkali is also easily soluble in water, and the aqueous solution is yellow. Alkali is used for daily use. It can be used to wash clothes, and the effect of removing oil stains is very good. It can also be used in food processing, such as making food, etc., which can make a mess. The method of making it is either extracted from grass ash or obtained from natural ash.
In addition, alkali is an indispensable thing in life. The need for taste, the taste of food is not sweet; alkali has a great effect on washing and making food. The physical properties of the two determine their different uses, and the use of the two by the ancients also exhibited the wisdom of the past, which is beneficial to people's livelihood.

The combination of 2-% E6% BA% B4 and 6-%E7%A2%98%E5%90%A1 is very particular.
First, the material selection should be careful. 2-% E6% BA% B4 needs to choose raw materials with pure texture and good flexibility in order to make it still have unique toughness and ductility after co-casting; 6-%E7%A2%98%E5%90%A1 should be hard and wear-resistant materials, so that the combination of the two, rigidity and flexibility, complement each other.
Second, the control of the heat is very important. At the beginning, the slow baking with a slow fire makes the 2-% E6% BA% B4 and 6-%E7%A2%98%E5%90%A1 gradually warm, and the impurities in the material slowly escape. Then, the fire gradually fiercely reaches the appropriate temperature. At this time, 2% E6% BA% B4 is in a semi-molten state, and the 6-%E7%A2%98%E5%90%A1 is slightly soft, which is convenient for the two to penetrate and fuse with each other. If the heat is insufficient, the two are difficult to be closely connected and easy to separate. If the heat is too high, the material may overmelt and lose its original characteristics.
Third, the casting system needs to be refined. According to the shape of the required utensils, carefully build the mold. The inner wall of the mold must be smooth and flat, so that the 2% E6% BA% B4 and 6-%E7%A2%98%E5%90%A1 can be evenly distributed after injection, and can perfectly fit the profile of the mold. The design of the mold should also consider the hole of the exhaust gas to prevent the gas from being trapped in it during the casting, causing defects such as pores in the utensils.
Fourth, there is also a trick to the injection method. The 2-% E6% BA% B4 and 6-%E7%A2%98%E5%90%A1 that have reached the appropriate state are injected into the mold at a steady and uniform speed. The injection process cannot be interrupted, and attention should be paid to the ratio of the two and the uniformity of mixing, so that the quality of the combined cast can be high, and both are good.

The matter of casting swords is related to the creation of skills and utensils. There are many taboos and must not be ignored between storage and transportation.
The materials used in casting swords are mostly fine iron and gold, which are hard and heavy in texture. When storing, be sure to choose a dry place to prevent it from being damp and rusting and rotting. If the material is damaged, the sharpness and toughness of the sword will be affected. The ancient swordsmiths often used special wooden boxes to hold the sword material, and the box was covered with moisture-proof felt cloth, which was placed in the high pavilion to avoid the moisture of water.
After the sword is completed, the transportation also needs to be cautious. The sword is a sharp blade, sharp and exposed, and it is easy to hurt people if you are not careful. During transportation, the sword should be wrapped in layers of thick cloth, and it should be delivered slowly and steadily. For long-distance transshipment, it is even more necessary to customize a solid wooden box with built-in soft cushions, so that the sword body is stable and will not be damaged by bumps and collisions. In the past, when swords were paid tribute or given to distinguished guests, they were all sent with strong men, carefully escorted, and careful along the way.
Furthermore, swords have spirituality, and many ancients had this idea. In storage and transportation, its symbolism should not be ignored. The room where the sword is stored should be clean and solemn, and should not be in the same place as filth. When carrying the sword, the handler should clean his hands and face to show respect. This is not just an act of superstition, but a respect for the skill of forging swords and the majesty of the sword. In this way, the quality and charm of the sword can be preserved, and its sharpness and elegance will not be lost in the passage of time.