4 Iodo O Xylene

Diethylene glycol is a colorless, transparent and hygroscopic viscous liquid, odorless, slightly sweet and spicy. Its physical properties are quite unique and worthy of further investigation.
Looking at its properties, diethylene glycol is in the liquid form at room temperature, which gives it specific application possibilities in many fields. In terms of melting point, it is about -10.45 ° C. The lower melting point allows it to remain liquid in a relatively low temperature environment, providing convenience for some processes that require low temperature operation. The boiling point reaches 245 ° C. The higher boiling point indicates that it has good thermal stability and is not easy to evaporate and dissipate in higher temperature environments. It is suitable for many industrial processes involving high temperature treatment.
When it comes to density, diethylene glycol is about 1.1184 g/cm ³ at 20 ° C, which is similar to the density of water, which affects its distribution and mixing in the solution system. It can be miscible with water, ethanol, acetone, ether, ethylene glycol, etc., but almost insoluble in organic solvents such as benzene, toluene, carbon tetrachloride. This difference in solubility is of great significance for separation, purification and construction of different chemical reaction environments.
Furthermore, the viscosity of diethylene glycol is relatively high, which plays a key role in lubrication, thickening and other application scenarios, which can effectively improve the fluidity and adhesion of substances and improve product performance. At the same time, it has a certain degree of hygroscopicity and can absorb moisture in the air, which not only brings application value in moisturizing and other aspects, but also needs to be properly handled during storage and use to prevent adverse effects on quality due to moisture absorption.
In summary, the unique physical properties of diethylene glycol, such as melting point, boiling point, density, solubility, viscosity and moisture absorption, together determine its wide application and unique position in many fields such as chemical industry, medicine, textile, etc.

Diethylene glycol is a colorless, odorless, transparent and hygroscopic viscous liquid with a slightly sweet and spicy taste. Although diethylene glycol is not directly mentioned in the chemical matters involved in "Tiangong Kaiwu", according to today's chemical knowledge, its chemical properties can be deduced as follows:
First, it has good solubility. Diethylene glycol can be miscible with various polar organic solvents such as water, ethanol, and acetone in any ratio. This is because its molecular structure contains two hydroxyl groups (-OH), which are hydrophilic groups and can form hydrogen bonds with water molecules, so it has high solubility in water. And this property makes it often used as a solvent in many chemical processes, helping to dissolve substances that are difficult to dissolve in water and promoting the smooth progress of the reaction.
Second, it has a certain chemical stability. Under normal conditions and at room temperature, diethylene glycol is not easy to react significantly with common weak oxidizing agents, reducing agents or acid bases. However, under severe conditions such as high temperature, strong acid or strong base, its chemical stability will be affected. For example, under the action of concentrated sulfuric acid, diethylene glycol can dehydrate when heated. Depending on the reaction conditions, diethylene glycol ether compounds may be formed, or further dehydrated to form olefins and other products.
Third, flammability cannot be ignored. Diethylene glycol is a flammable substance and can be burned when exposed to open flames and hot topics. When it burns, it releases a lot of heat and generates carbon dioxide and water. This property warns that when storing and using diethylene glycol, it is necessary to pay attention to fire prevention measures to prevent fire accidents.
Fourth, esterification reaction can occur. In view of the presence of hydroxyl groups in the molecule, diethylene glycol can be esterified with carboxylic acids or its derivatives under suitable conditions such as acid catalysis to generate corresponding ester compounds. This reaction is widely used in the field of organic synthesis and can be used to prepare a variety of organic products such as fragrances and plasticizers.

4-The main use of Shaoyu, there is something in the "Heavenly Works". Shaoyu, its flowers are not only useful, but also useful.
The use of, has been in the past. The home of scholars is mostly planted in the garden. Every flowering period, the flowers are clustered, beautiful and colorful, the white ones are like snow, and the pink ones are like glow, attracting the elegant people, and it is important to make it for its beauty. Or in the room, inserted in a bottle, can add to the elegance of the room.
The way it is used is especially important. Its roots can enter the room, the nature is slightly cold, the taste is bitter and sour. It has the effect of calming the liver and relieving pain, killing blood, and antiperspiration. It is often used for costal pain caused by liver pain, and it can also be used for people's monthly pain and pain. If there is a cold blood, it can be used for blood damage; if the liver is hyperactive and the pain is dazzling, it can be accompanied by rattan, stone, etc., which can calm the liver. And Shao is used for the disease of spontaneous sweating and sweating, and it also has the power of antiperspiration, which is very useful in bed.
Therefore, it can be seen that Shao is beautiful because of its beauty, which is harmful to people's ears and eyes; with its effect, it is very useful for people's illness and pain.

There are several methods for the synthesis of 4-benzyl-2-methylimidazole. The main ones are as follows:
One is to use o-methylimidazole and benzyl halide as raw materials, add alkali catalysis in a suitable solvent, and obtain nucleophilic substitution reaction. This reaction condition is mild and easy to operate. If ethanol is selected as the solvent and potassium carbonate is selected as the base, heat it up to a certain temperature to make the two fully react. After the reaction is completed, the pure 4-benzyl-2-methylimidazole can be obtained by separation and purification steps, such as column chromatography or recrystallization.
Second, with 2-methylimidazole and benzyl alcohol as raw materials, under the action of a catalyst, a dehydration condensation reaction is carried out. This catalyst can be selected from p-toluenesulfonic acid, etc. In a solvent such as toluene, heat reflux is heated to promote the reaction. During the reaction, water is continuously removed to promote the reaction in a positive direction. After the reaction is completed, the target product can also be obtained through vacuum distillation, washing, drying and other steps.
Third, a suitable nitrogen-containing heterocyclic compound and a benzylating agent are synthesized through a multi-step reaction. For example, a specific intermediate is prepared first, and then the intermediate is reacted with the benzylating agent under specific conditions. Although this method is a little complicated, it can be fine-tuned according to the needs of the product structure.
All synthesis methods have their own advantages and disadvantages. In practical applications, when considering the availability of raw materials, cost, product purity requirements and other factors, select the appropriate one and use it to efficiently obtain 4-benzyl-2-methylimidazole.

It is also a good prescription for treating spleen and kidney deficiency and cold. When storing and transporting it, all matters should be paid attention to.
The most important thing for storage is the first environment. When choosing a dry place to prevent the drug from getting damp. If it is in a humid place, the drug is prone to mildew, and the effect of the drug will be damaged. And it should be avoided from direct sunlight. The intensity of sunlight can cause the decomposition and change of the drug components, resulting in its ineffectiveness. In addition, the temperature should also be appropriate, not too high or too low. If it is too high, the drug will easily evaporate and deteriorate, and if it is too low, it will cause changes in the drug properties, which is not conducive to the survival of the drug effect.
When transporting, there are also many details. The action should be gentle and avoid bumps and vibrations. If there is too much shock on the way, the pill may break, which not only damages the appearance, but also affects the uniformity of its ingredients, which in turn affects the curative effect. The packaging must be solid to protect the drug from being crushed and damaged by external forces during transportation. It is best to choose suitable packaging materials that can not only prevent moisture but also absorb shock.
In addition, whether stored or transported, it should be kept away from odors. Odor gas, or run into the drug, changes its smell and properties. And it must be stored and transported separately from other items, especially those that are polluting or corrosive, to prevent mutual influence and reduce the quality of the drug. In this way, it is necessary to properly store and transport the four divine pills, so that their efficacy can be preserved, and they can be applied to patients to treat the disease of spleen and kidney deficiency and cold.