Pyrazine,2-butyl-

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, in which there are many detailed descriptions of the physical properties of various things. However, it is difficult to know what it refers to, because the expression is too obscure, it is difficult to find it in ancient books and common scientific concepts.
If "2" is a number, the word "Yiji" is not a general term in ancient Chinese and traditional scientific and technological concepts. Or it is a man-made word today, but there is no more background information, it is difficult to know exactly what it refers to, and it is impossible to talk about the physical properties of the object.
In "Tiangong Kaiwu", the description of the physical properties of all things is based on common things, materials and processes at that time. Such as the texture of hardware, the characteristics of clay, the properties of silk and linen, etc., are all described in detailed and vivid words. However, the bizarre expression "2-one-base -" contradicts the content of the book and traditional cognition.
If this is an abbreviation or code for a specific modern field, it is impossible to judge its physical properties due to the lack of knowledge and description of the corresponding field. When it comes to physical properties, it often involves color, odor, density, hardness, electrical conductivity, thermal conductivity, etc. However, it is impossible to explain its physical properties without knowing what "2-one-base -" refers to.

The chemical properties of dicyano- are quite unique. This substance has strong reactivity, often appears in various chemical reactions, and is mostly used as a key intermediate.
Its electrophilicity makes it easy to react with electron-rich reagents such as olefins and alkynes. After the nucleophilic addition process, a new carbon-carbon bond is formed. This is an important means for organic synthesis to build a complex molecular structure. Dicyano- In an alkaline environment, it can undergo hydrolysis reaction, and the cyano group is gradually converted into a carboxyl or amide group. This property is widely used in the preparation of compounds containing carboxyl or amide groups.
In redox reactions, dicyano- also exhibits. It can be oxidized by specific oxidants, and the cyano group structure can be changed to realize functional group transformation. In the case of strong reducing agents, the cyano group can be reduced to an amino group, opening up a path for the synthesis of nitrogen-containing compounds.
At the same time, dicyanyl-due to the strong electron-absorbing effect of cyanyl group, the electron cloud distribution is unique, and the molecular stability and reaction selectivity are affected. The introduction of dicyano- into aromatic compounds can significantly change the electron density of aromatic rings, affecting their electrophilic substitution reactivity and check point selectivity.
In addition, some derivatives of dicyanyl-have special optical and electrical properties, which have emerged in the field of materials science. For example, some organic semiconductor materials containing dicyano- exhibit good charge transfer properties, providing new material options for the development of organic electronic devices, such as organic Light Emitting Diodes and field-effect transistors.

Alas! And the use of "2-based -" domain, this is a delicate one. Let me briefly describe it in the book "Tiangong Materials".
If the husband is "2-based -", it is used in the field of chemistry. In terms of synthesis, it can be an important component. Due to the characteristics of "2-based -", it can be used to multiply and reverse effects, such as nuclear substitution and addition. It is also indispensable in the field of chemical research. The molecules of the chemical are often used in these groups to give the specific activity, solubility and targeting of the chemical.
Furthermore, in the field of materials, "2-based -" also has its place. In the synthesis of polymer materials, it may be used as the starting point of polymerization reaction or as the basis for enhancing the performance of the material. For example, the rational use of some high-performance plastics, properties, and "2-based -" can improve the mechanical properties and chemical resistance of the material.
In the field of "2-based -" based molecules, it can be used in semi-functional materials. This material exhibits unique properties in devices such as optical diodes (OLEDs) and energy pools. Because of its ability to improve the performance of molecules, improve the transfer rate of fluids, and improve the efficiency and characterization of devices.
In the biological field, "2-based -" can be used for the repair of biomolecules. For example, in the synthesis of peptides and nucleic acids, the introduction of "2-based -" can change the characteristics and characterization of biomolecules, and can be used in cutting-edge technologies such as bioprospecting and gene therapy.
Therefore, "2-based -" has important applications in many fields such as chemistry, materials, molecules, and biology, and is also a new element of scientific research technology.

There are various ways to prepare 2-heptanone, which are described in detail below.
First, n-hexanol and acetyl chloride are used as raw materials. First, n-hexanol is mixed with an appropriate amount of alkaline agent such as pyridine, and then slowly dripped into acetyl chloride, which reacts at a low temperature. At this time, the hydroxyl group of n-hexanol reacts with the chlorine atom of acetyl chloride to generate 2-heptanone and hydrogen chloride. However, it should be noted that the amount of pyridine in this reaction needs to be precisely controlled. Excessive amounts can easily lead to side reactions, and the reaction temperature is also very important. If it is too high, the reaction rate will be too fast, which is not easy to control. If it is too low, the reaction will be slow and take a long time. After the reaction is completed, 2-heptanone is separated by distillation, and then purified by distillation to obtain a pure product.
Second, by the method of Grignard reagent. First, magnesium strips and bromoethane are taken in an anhydrous ether environment to prepare ethyl magnesium bromide Grignard reagent. In addition, hexanal is dissolved in anhydrous ether, and the prepared Grignard reagent is slowly added dropwise under low temperature and stirring. The ethyl group in the Grignard reagent is added to the carbonyl group of hexanal to form the corresponding alkoxide intermediate. Later, the intermediate is hydrolyzed with dilute acid to obtain 2-heptanol. 2-Heptanone can be obtained by oxidizing 2-heptanol with a suitable oxidizing agent, such as a mixture of potassium dichromate and sulfuric acid. In this method, the environment in which the Grignard reagent is prepared must be anhydrous, otherwise the Grignard reagent is easily decomposed and the reaction fails. In the oxidation step, the amount of oxidizing agent and the reaction time need to be carefully controlled to prevent excessive oxidation.
Third, take 2-heptanol as the starting material, use a suitable catalyst and oxidizing agent, such as copper as the catalyst and oxygen as the oxidizing agent, and carry out catalytic oxidation at an appropriate temperature and pressure. The hydroxyl group of 2-heptanol is oxidized to carbonyl, and then 2-heptanone is obtained. This approach is relatively green and environmentally friendly, but the requirements for reaction equipment and conditions are quite high. Temperature, pressure and catalyst activity all have a great impact on the yield and selectivity of the reaction. All conditions need to be carefully adjusted to achieve the best reaction effect.

Xiang Xiu, "What is the impact of the second advance - Ji Kang - on the environment?" This question is quite profound, so let me elaborate.
Ji Kang was an outstanding figure of the Seven Sages of the Bamboo Forest during the Wei and Jin Dynasties. His talent was absolutely high and his integrity was superb. Xiang Xiu and Ji Kang interacted inexorably, and the two often spent time under the bamboo forest, talking about the profound, drinking and writing poetry, and exploring the truth of heaven and earth together.
Ji Kang had a profound impact on the environment he lived in. In terms of scholarly ethos, Ji Kang advocates nature, pursues authenticity, and opposes the hypocritical bondage of famous religions. His words and actions were like a breeze, which washed away the officialdom and scholarly forests that were filled with hypocrisy and rigidity at that time. With his own uninhibited nature, he inspired many scholars to break free from the shackles of traditional ethics, to explore the true meaning and value of life, and injected new vitality and ideas into Scholastic.
In terms of cultural creation, Ji Kang's poetry and prose have a unique style, sharp words and sincere emotions. His "Book of Breaking Friendship with Mountain Giant Source", laughing and cursing, and expressing his heart, not only shows his extraordinary literary talent, but also shows his inner disdain for secular power and power. Such literary styles set a new model for the literary world at that time and influenced the creative styles and orientations of many scholars.
Furthermore, Ji Kang's death also had a major impact on the environment at that time. Sima Zhao wanted to kill Ji Kang to intimidate dissidents, but before Ji Kang was sentenced, he looked calm and played "Guangling San", which moved the audience calmly. This incident made scholars all over the world deeply aware of the cruelty of the Sima regime, and also inspired more people's dissatisfaction and resistance to Sima's rule, which changed the delicate relationship between Shilin and politics to a certain extent.
And Xiang Xiu, after Ji Kang passed away, although he was forced to become an official due to the situation, he always couldn't forget his past with Ji Kang and the spirit Ji Kang upheld in his heart. Xiang Xiu's "Fu of Thinking of the Old", although short, is full of deep nostalgia for Ji Kang, and also reflects Ji Kang's profound influence on his life and thoughts from the side. In short, Ji Kang has left an indelible mark on many aspects such as the culture, cultural creation and political environment of Shilin.