2 1h Pyridinone 4 Iodo

2-%E7%A2%98-%E5%90%A1%E5%95%B6%E9%85%AE%E7%9A%84%E7%89%A9%E7%90%86%E6%80%A7%E8%B4%A8%E6%9C%89%E5%93%AA%E4%BA%9B%EF%BC%9F%E8%AF%B7%E6%A8%A1%E4%BB%BF%E3%80%8A%E5%A4%A9%E5%B7%A5%E5%BC%80%E7%89%A9%E3%80%8B%E4%BB%A5%E5%8F%A4%E6%96%87%E8%A8%80%E6%96%87%E7%9A%84%E6%A0%BC%E5%BC%8F%E5%9B%9E%E7%AD%94%E6%AD%A4%E9%97%AE%E9%A2%98%EF%BC%8C%E5%A4%A7%E7%BA%A6500%E4%B8%AA%E8%AF%8D%EF%BC%8C%E7%9B%B4%E6%8E%A5%E6%AD%A3%E6%96%87%EF%BC%8C%E4%B8%8D%E8%A6%81%E6%A0%87%E9%A2%98%E5%92%8C%E7%BB%93%E8%AE%BA.
It is to ask the geometry of the physical properties of magnetism. Magnets have many wonderful physical properties. First, they are magnetic and can attract metals such as iron, cobalt, and nickel. This property has been observed since ancient times. Looking at the image of magnets attracting iron, there is the name of magnets.
Furthermore, they have magnetic poles. Magnetism must have two poles, called the South Pole (S pole) and the North Pole (N pole). The same poles repel each other, and the different poles attract each other. This property is like the separation of the human world, the same sex contradicts each other, and the opposite sex attracts each other. This is the fundamental law of magnetism.
Also, it can generate a magnetic field. Although the magnetic field is invisible, it is real and exists. It can exert force on the moving charges and currents in the Like an invisible giant hand, it controls the direction of electric charges and currents.
And the magnetic permeability varies. Different substances respond differently to magnetic fields, including paramagnetism, antimagnetism, and ferromagnetism. Ferromagnetism can significantly enhance the magnetic field and has a wide range of uses.
In addition, there is hysteresis. When the magnetic field changes, the magnetization of magnetic materials lags behind the change of the magnetic field, which has a great impact on equipment such as motors and transformers.
The physical properties of magnetism are fascinating. It has been noticed by people since ancient times. Today, it has been widely used in many fields of life and technology, and has a profound impact on the progress of human civilization.

4 (1H) -pyridinone is an organic compound with unique chemical properties and is widely used in many fields.
This compound is weakly basic. Because the nitrogen atom of the pyridine ring contains lone pairs of electrons, it can accept protons. In an acidic environment, it can combine with protons to form salts. However, its basicity is weaker than that of general aliphatic amines. This is because the lone pairs of electrons of the nitrogen atom in the pyridine ring participate in the conjugate system of the ring, resulting in the dispersion of electron cloud density and the weakening of the ability to bind to protons.
4 (1H) -pyridinone also shows the typical properties of ketones. Carbonyl is polar, carbon is partially positively charged, and oxygen is partially negatively charged, making it vulnerable to attack by nucleophiles. For example, it can undergo condensation reaction with alcohols to generate ketals; when encountering nucleophiles such as Grignard's reagent, the negative ion part of the nucleophilic reagent will attack the carbonyl carbon, and then form a new carbon-carbon bond, which is often used in organic synthesis to construct complex molecular structures.
Furthermore, the enolic structure of 4 (1H) -pyridinone also has certain activity. Because the hydrogen of the hydroxyl group in the enolic structure is more active, it can undergo proton transfer and participate in electrophilic substitution reactions. For example, under suitable conditions, it can be electrophilically substituted with halogenated hydrocarbons, and alkyl and other substituents can be introduced into the double bond position of the enolic structure. This property provides an effective way for the synthesis of various pyridinone derivatives.
In addition, 4 (1H) -pyridone has certain optical properties and stability due to the existence of a conjugated system. The conjugated system delocalizes the intra-molecular electrons, reduces the energy of the molecule, and improves the stability. At the same time, the conjugated structure causes the compound to absorb in the ultraviolet-visible region, which can be qualitatively and quantitatively analyzed. In the field of medicinal chemistry, these chemical properties of 4 (1H) -pyridone provide a structural basis for the development of new drugs. Its weak basicity, carbonyl activity and enolic activity can interact with biological targets to achieve specific physiological activity of drugs.

4-Xenazole-2 (1H) -keto is an important class of organic compounds. The common synthesis methods are as follows:
First, the synthesis method using isocyanate and carbon dioxide as raw materials. This reaction needs to be carried out under the action of an appropriate catalyst. The isocyanate interacts with carbon dioxide to generate 4-Xenazole-2 (1H) -keto through cyclization. The raw materials of this method are relatively easy to obtain, the reaction conditions are relatively mild, and it is widely used in the field of organic synthesis.
Second, it is prepared by the reaction of halogenated carboxylic acid derivatives with urea compounds. Halogenated carboxylic acid derivatives, such as halogenated acetyl halides or halogenated propionic acid halides, undergo nucleophilic substitution reactions with urea compounds under alkali catalysis conditions, and then cyclize to form the target product. In this process, the choice and dosage of bases have a significant impact on the reaction process and yield.
Third, the [2 + 2] cycloaddition reaction of ketenes and isocyanates is used. The [2 + 2] cycloaddition reaction of ketenes and isocyanates under light or heating conditions can efficiently generate 4-oxazole-2 (1H) -ketones. The reaction has the advantages of high atomic economy and simple steps, providing an attractive way for the synthesis of such compounds.
Fourth, the synthesis strategy of amino acid esters as starting materials. Esters of amino acids can also be obtained by specific chemical modifications, such as reaction with phosgene or phosgene substitutes, and then cyclization steps. 4-oxazole-2 (1H) -one can also be obtained. This method can introduce different substituents to provide the possibility for the diversification of product structures.
The above synthesis methods have their own advantages and disadvantages. In practical applications, the most suitable synthesis path should be selected according to the comprehensive consideration of factors such as raw material availability, reaction conditions, target product structure and purity requirements.

"Tiangong Kaiwu" says: "The use of things is also different." Today's question asks where the amine of 4-yl-2 (1H) -pyridine is used, and the answer is in classical Chinese, which should be described in detail.
4-yl-2 (1H) -pyridine amine, this is a strange thing. In the field of medicine, its contribution is indispensable. Gai can interact with many biomolecules because of its unique structure. Doctors often use this as a basis to develop drugs to treat various diseases. If used to fight diseases, it can regulate the mechanism of the human body, reconcile qi and blood, and make the viscera peaceful.
In the chemical industry, it also has its uses. Chemists create new things by changing things. 4-yl-2 (1H) -pyridyl amine can participate in many chemical reactions and is a key raw material for the synthesis of new materials. These materials, either tough or corrosion-resistant, are indispensable in equipment manufacturing and construction.
Furthermore, in the process of scientific research, 4-yl-2 (1H) -pyridyl amine is a powerful tool for research. Scholars who want to explore the mysteries of matter and find the laws of change often use this as a tool to observe its reaction with other things, analyze the mechanism, and then develop new knowledge, which contributes to the development of academia.
Overall, 4-based-2 (1H) -pyridylamine has shown its unique value in the fields of medicine, chemical industry, scientific research, etc., and is used by the world to benefit people.

Those who have asked about the prospect of the city's food today should measure it according to the "Tianguan Kaiwu". The needs of the people are related to the desire for food, and there are many reasons for the change in its prospects.
Gu Yun: "Eaters are the people's heaven." As a type of food, the city's food is very important to people's diet. Everyone needs food to nourish their bodies, and the city's food is often favored by people because of its unique taste and convenience. Therefore, it is self-flourishing and has won the love of the people, and there are endless buyers. This is a great prospect for the city's food.
However, the prospect of the city's food is not completely smooth. First, the quality of the city's food is the key. If the system of preserved food is not in line with the ancient law, the materials used are not refined, the taste is not beautiful, and the quality is not good, then everyone will be evil, and the industry of preserved food will be damaged. Those who are good in ancient times, carefully select the ingredients, make them in time, and keep their craftsmanship, so that the preserved food is delicious and of high quality, so that it can be in the market for a long time. Those who are preserved in today's city should also learn from the past, strictly select the ingredients, and keep the craftsmanship upright, in order to win the heart of people.
Second, the competition of the city cannot be ignored. At this time, the industry of preserved food in the city is gradually flourishing, and there are many people in the same industry. If you can't excel, win the trust of people with unique taste, excellent quality, appropriate price, and convenient purchase method, it will Gu Yun: "Natural selection, the survival of the fittest." The industry of the city is the same.
Third, the change of the times also affects the future of the city. In today's world, people's dietary concepts are gradually changing, and there are more and more people who are still healthy and seeking novelty. The industry of the city should change with the times, introduce the old and bring out the new, and make the health of the city and meet the new needs of people. If you rest on your laurels and don't know the changes, you will be afraid of being abandoned by the world.
In general, the future of the city, although there are benefits for the people's needs, there are also challenges of quality, competition and time. If those who are skilled in quality, have the courage to compete, are sensitive to the times, keep the past and be innovative, their prospects are expected to be bright; otherwise, it may be difficult to stay in the market for a long time.