Imidazole-4,5-dicarboxamide

In order to understand the chemical structure of tetra- and five-diacetonitrile hydrazine, it is necessary to explore the chemical theory in detail.
tetra- and five-diacetonitrile hydrazine, its structure contains the basic structure of hydrazine. Hydrazine is a compound with two amino groups connected by a single nitrogen-nitrogen bond, which is the core skeleton of the substance. In tetra- and five-diacetonitrile hydrazine, the specific positions of hydrazine, that is, the four and five positions, are respectively connected by acetonitrile groups. Acetonitrile group, the structure of -CH 2O CN is also, in which -CN is a cyanyl group, which has strong electronegativity and reactivity, and -CH 2O - is a methylene group, which plays a connecting role.
Looking at the whole, the nitrogen-nitrogen bond of hydrazine is the central axis, and the acetonitrile groups at the fourth and fifth positions on both sides are relatively distributed. This structure endows the unique chemical properties of four and five-diacetonitrile hydrazine. Due to the existence of cyanyl groups, this substance can participate in many reactions such as nucleophilic substitution and addition. The distribution of its electron cloud is affected by the interaction between cyanyl groups and hydrazine skeletons, resulting in specific polarity and reaction check points.
and the atoms in this structure are connected to each other by covalent bonds to form a stable three-dimensional space structure. The electronegativity differences of different atoms lead to electron cloud migration, which in turn affects the physical and chemical behavior of molecules. Physical properties such as solubility, melting point, boiling point, and reactivity in organic synthesis, pharmaceutical chemistry, etc., are closely related to the unique chemical structure of tetra- and penta- diacetonitrile hydrazine.
is the chemical structure of tetra- and penta- diacetonitrile hydrazine, which is cleverly combined with the acetonitrile group at a specific location. This structure lays the foundation for its research and application in the field of chemistry.

"Tiangong Kaiwu" contains 4,5-dimethylpyrimidinol acetate, which has a wide range of uses.
First, in the field of medicine, it can be a key raw material for the synthesis of specific drugs. The unique chemical structure of 4,5-dimethylpyrimidinol can participate in the construction of many drug molecules, helping to create drugs with specific therapeutic effects, or used for antibacterial or antiviral, to treat various diseases and relieve the suffering of patients.
Second, in the field of pesticides, it also plays an important role. Based on this, efficient and low-toxic pesticide products can be developed. Such pesticides can precisely act on pests, inhibit their growth and reproduction, and protect crops from pests and diseases, thereby ensuring food yield and quality, which is fundamental to people's livelihood.
Third, in the chemical industry, 4,5-dimethylpyrimidinol can be used as an intermediate in organic synthesis. With its chemical activity, it can react with many compounds to derive a wide variety of chemical products, such as plastics with special properties, rubber additives, etc., which contribute to the enrichment and development of the chemical industry.
Fourth, in scientific research and exploration, it provides important samples for researchers to study the properties and reaction mechanisms of pyrimidine alcohol compounds. Through in-depth study of it, new chemical synthesis paths may be opened up, promoting the progress of chemical theory and practice.
In short, acetic acid-4,5-dimethylpyrimidinol plays an indispensable role in many fields such as medicine, pesticides, chemical industry and scientific research, and has a profound impact on human life and scientific and technological development.

"Tiangong Kaiwu" says: "Saltpeter and sulfur are all the essence of yin, and they are poisonous. Where nitrate is to yin, sulfur is to yang, and the two gods of yin and yang meet in a seamless and tolerable state. When it comes out, the character is taken by it, and the soul is scattered and the soul is shocked and the powder is broken." This word 4,5-dinitrobenzoic acid, this is also a poisonous thing.
Its physical properties, the first word color state. 4,5-dinitrobenzoic acid is often in the shape of light yellow crystals, with a bright color and luster. It is placed under normal temperature and pressure, and the texture is stable. When it encounters hot topics and open flames, it is prone to danger.
Let's talk about its solubility. This substance is slightly soluble in cold water, just as cold water cannot tolerate it. However, in hot water, the solubility gradually increases, such as melting ice in the warm sun, and it can be seen melting in water. It is also soluble in organic solvents such as ethanol and ether, just like the swimmer soil, which is insoluble.
When it comes to melting point, 4,5-dinitrobenzoic acid has a high melting point. It needs to reach about 210 ° C - 213 ° C before it begins to melt. It seems that extreme heat is required to break its solid state shape.
Furthermore, 4,5-dinitrobenzoic acid has a density greater than that of water. If it is placed in water, it will sink to the bottom of the water, such as a stone falling into the abyss, which is also one of its physical characteristics.
From the above, it can be seen that the color state, solubility, melting point, density and other physical properties of 4,5-dinitrobenzoic acid are different, all due to its unique molecular structure. Looking at its physical properties, it can also be known that its application in the field of chemistry.

Although the synthesis method of 4,5-dimethylpyrimidine is not directly mentioned in "Tiangong Kaiwu", it can be speculated as follows based on the principles of ancient chemical processes and the preparation ideas of related similar substances.
To make 4,5-dimethylpyrimidine, you can start from basic raw materials. In ancient times, natural substances were often used as the starting point, such as materials rich in carbon and nitrogen. Taking grain fermentation products as an example, organic components containing carbon and nitrogen can be obtained after specific treatment.
First, such raw materials are placed in a special ceramic kettle and baked slowly over charcoal fire. Temperature control is extremely critical, such as "the degree of warm wine, not strong or slow". After baking, some components in the raw materials are decomposed and transformed to form a variety of intermediates.
Then, rinse the product in the pottery kettle with water and take its clear liquid, which already contains part of the basic structure required for the target synthesis. Then add an appropriate amount of plant ash to the clear liquid and stir well. The plant ash can adjust the pH of the reaction environment, just like "reconciling tripods and tripods, balancing yin and yang".
After that, move the mixed liquid to a sealed porcelain urn and bury it in the soil for several days. The soil is warm and constant temperature, just like "giving birth to vitality, waiting for it to self-transform". Take it out after a few days, and collect fractions in a specific temperature range by distillation. The ancient distillation apparatus was preferably made of copper-tin alloy. During distillation, "observe its gas and observe its color" to accurately grasp the heat and temperature.
The fractions collected are reprocessed, or exposed to sunlight, or co-cooked with other natural agents, which further promotes the transformation and polymerization of the ingredients, and gradually builds the structure of 4,5-dimethylpyrimidine. However, the product obtained by this method or the purity is not good, but under the conditions of the ancient method, it is also the best effort. Although the above is only a speculation based on the principles of the ancient method, it may be possible to explore the wisdom and ideas of ancient chemical processes.

"Tiangong Kaiwu" has a saying: "Saltpeter and sulfur, the original cremation medicine, are the most powerful, and they are important items in the army, but there are also reasons for caution. Today, when it comes to nitrohydrazide, there are also many precautions for the use of this substance."
Nitrohydrazide is highly oxidizing and unstable. In case of heat, friction, and impact, it is easy to cause violent reactions and risk explosion. Therefore, when storing, it is necessary to choose a cool, dry, and ventilated warehouse, away from fire and heat sources, and separate from flammable, combustible, and reducing agents. Do not mix, so as to avoid accidental contact and lead to disaster.
When handling, the operator should be extra careful, pack and unload lightly, and do not drop or hit, so as not to damage the packaging and cause danger. When taking it, it is necessary to prepare professional protective equipment, such as protective glasses, gloves, protective clothing, etc., to prevent it from coming into direct contact with the body and damaging the skin. The operating environment must also be well ventilated to prevent the accumulation of harmful gases.
Furthermore, the use of hydrazine dinitrosylate should be in accordance with precise procedures and dosage. Do not increase or decrease the dose without authorization, so as not to lose control of the reaction. After use, the remaining items should not be discarded at will, and should be properly disposed of according to regulations to prevent environmental pollution and lay safety hazards.
In short, although hydrazine dinitrosoxide has specific uses in some fields, due to its inherent dangerous characteristics, it must be used with precision and detail throughout the process, and it must not be slack in order to ensure personnel safety and production stability.