6-Hydroxy-3-iodo-2-methylpyridine

Urea is also used as the foundation of urea. Urea has unique chemical properties and is an organic compound with weak alkalinity.
Urea can interact with acids to form corresponding salts. In case of strong acids, urea salts can be formed. This is because the unshared electron pair on the nitrogen atom accepts protons.
can also undergo hydrolysis reaction. Under the condition of urease or strong acid and strong base combined heating, urea hydrolyzes to produce ammonia and carbon dioxide. This reaction is quite important. In vivo, urease catalyzes the hydrolysis of urea to excrete nitrogen.
Furthermore, urea can participate in condensation reactions. If condensed with formaldehyde, urea-formaldehyde resin can be formed. This resin has a wide range of uses and is often used in the manufacture of adhesives, plastics, etc.
And urea also plays a key role in protein metabolism. Ammonia produced by protein decomposition in animals is mostly converted into urea and excreted in urine, which is an important mechanism for the body to maintain nitrogen balance.
The chemical properties of urea groups such as weak alkalinity, hydrolysis, condensation, and key roles in biological metabolism make them have important uses and significance in many fields such as chemical industry and biology.

Mercury, its main use is related to alchemy, medicine, and various fields of technology.
Along with alchemy, ancient alchemists believed that mercury has magical effects. For example, in the Inner Part of Baopuzi, alchemists believed that mercury can be specially refined into "returning pills", and the ability to serve it can make people immortal. They are based on mercury and mixed with all kinds of gold stones, which are burned in alchemy furnaces, hoping to refine miraculous pills. This wind was especially prosperous in the Qin and Han Dynasties to the Tang and Song Dynasties. Many emperors and generals believed in it and wanted to seek longevity. For example, Qin Shi Huang sent Xu Fu to the sea with boys and girls to seek immortal medicine, which may also contain mercury.
On medicine, mercury is also used. The ancient medical book "Shennong Materia Medica" lists mercury as the middle grade, saying that it is "the main scabby fistula scab to choose white baldness, kill lice in the skin, abortion, remove heat, and kill gold, silver, copper, and tin poison". Doctors take its toxicity to treat skin diseases such as scabies and sores. However, mercury is toxic. If the dosage is not appropriate, it will cause poisoning and endanger the life of the patient.
In terms of technology, mercury is used in the art of gilding. Artisans fuse mercury and gold into gold amalgam, apply it to the surface of the utensils, and heat the mercury to evaporate, while the gold remains in the utensils to form a thin golden layer, which can make the utensils beautiful and anti-corrosive. This technique is more common in making luxurious bronze and gold and silver utensils, making the utensils more magnificent.
Although "Tiangong Kaiwu" did not elaborate on the toxic hazards of mercury, at that time, mercury was widely used in alchemy, medicine, and technology, adding a unique touch to the development of ancient people's life, culture, and technology.

The synthesis of 6-carboxyl-3-pyridine-2-carboxylic acid is a key issue in the field of chemical synthesis. Under the guidance of the thinking of "Tiangong Kaiwu", many traditional and innovative methods can be studied.
One is the synthesis path using natural products as the starting material. In the past, many wise men often searched for the basis of synthesis in all things in nature. Natural products containing related structures can be found, and the structure of 6-carboxyl-3-pyridine-2-carboxylic acid can be gradually constructed through various reactions such as hydrolysis, oxidation, and reduction through fine chemical transformation. This way is just like the ancients who used natural things according to the season and made use of natural things, and made the required materials through clever thinking. However, the sources of natural products may be limited, and extraction and separation also require exquisite skills and complicated processes.
Second, through the classical reaction combination of chemical synthesis. For example, pyridine derivatives are used as starters, and carboxyl groups and other necessary functional groups are introduced through nucleophilic substitution reactions. This reaction is similar to traditional chemical synthesis, and the molecular structure is constructed according to established rules and methods. Nucleophilic substitution reactions can be precisely regulated to achieve the desired product according to the characteristics of the reactants and reaction conditions. However, the control of reaction conditions needs to be exquisite, otherwise side reactions will easily occur, resulting in impaired product purity and yield.
Furthermore, the synthesis strategy of transition metal catalysis. Today, transition metal catalysis shines brightly in organic synthesis. The unique activity of transition metal catalysts can be used to achieve efficient construction of carbon-carbon and carbon-heteroatom bonds. Using metals such as palladium and copper as catalysts, different reaction fragments are cleverly spliced through coupling reactions, etc., to generate target products. This is just like the use of ingenious tools in ancient times to achieve twice the effect with half the effort. However, transition metal catalysts may be more expensive, and the separation after the reaction also needs to be considered.
Another biosynthesis method. Simulate the metabolic pathway in the organism and use the catalytic specificity of enzymes to achieve the synthesis of 6-carboxyl-3-pyridine-2-carboxylic acid. This is similar to the creation of natural organisms by the ancients, with mild conditions and high selectivity. The conditions of enzyme-catalyzed reaction are mild and environmentally friendly, but the preparation and stability of enzymes may be a challenge.

When storing and transporting aluminium stone, it is essential to pay attention to all kinds of things.
The aluminium stone is strong in nature, and the storage place must be dry. If it is in a humid place, it is prone to moisture change and damage its quality. For example, if it is placed in a dark and humid corner, it will be soaked in condensation water for a long time, and the aluminium stone will gradually dissolve, losing its inherent state, and its medicinal power will also be reduced. Therefore, it is necessary to choose a high dry place, hold it in a tile or porcelain jar, and seal it tightly so that moisture cannot enter.
And when it is transported, it must also be carefully protected. The texture of aluminium stone is firm and brittle, and when handling, beware of collisions. If it is damaged by falling, not only will the material be damaged, but also the debris will fly, or it will pollute other objects. In case of rain on the way, it should also be properly sheltered and do not use water. If the boat is on the water, if the canopy leaks, the rainwater fills the cabin, and the ettringite is soaked, all previous efforts will be in vain.
Furthermore, ettringite is toxic, and it should be stored and transported away from food and where people and animals often come. If it is stored and transported with rice, fruits and vegetables, once it leaks and is mixed into it, it will be a great disaster to eat it by mistake. If it is placed in the main road of the market, children are ignorant and accidentally touch and eat it by mistake, the harm will not be shallow.
When transporting it again, the loading should be arranged reasonably according to its characteristics. Do not press it heavily to prevent it from breaking. If the stack is too high, the bottom layer of ettringite will be too heavy and will be broken. And when loading and unloading, the action
All of these, the precautions for the storage and transportation of alum stone are related to its quality and safety, and the industry should not be careless.

Today, there is no shortage of resources, and everyone wants to know. I have tried to understand it with the ancient method.
All things are affected by the environment, the land, and supply and demand.

In the past, there was no shortage of resources, and the city would not fail. Because of the abundant harvest, supply and demand, those who sell are not sold, and the city will not come down. For example, it rains in the past, and the city will be flooded in the past, and 20 to 30% of the people have it all year round.
If there is an apology, the damage will still be caused, and the harvest will not be harvested, and the supply will not be demanded, and the city will not be able to meet the demand. In the past, when there was a famine, there was no shortage of land, and the price of land would be as high as the price of land. In the past, there was a famine, and there was no shortage of land, which was twice as high as usual, and the people suffered unspeakably.
And the proximity of the land also affects it. Those who are close to the land, the province of the land, will be slightly cheaper; those who add more land, will be slightly higher. Such as the land of Beijing, which is far away from the land of the land, and the land of the land of the land, there is every increase.
There is also the operation of the business, and the operation of the government's order, all of which are the same. Those who are good, and who are good, stock up and wait for the high to be sold; the court often uses the method of peace, so that the people are not trapped in the high, and the business is not sick.
Therefore, if you want to know the city of the city, you must apologize for it, the proximity of the place, the commerce, and the implementation of the decree. If you combine this, you can get the outline of it. It is necessary to know everything, but according to this reason, it will not be too big.