"Tiangong Kaiwu" says: "The physical properties of 1,3-butadiene-2,4-dimethylnaphthalene are particularly important. This substance is liquid at room temperature, with a clear and transparent color and a slightly lighter taste. Its boiling point is quite high, around [X] ° C, which makes it require specific temperature conditions when separating and purifying. In addition, its melting point is around [X] ° C. Under low temperature environments, it is easy to solidify into a solid state, like a crystalline wax.
Its density is lighter than that of water, it floats on the water surface, and it does not dissolve with water. The two can be naturally stratified, which is very critical in chemical separation operations. The solubility of 1,3-butadiene-2,4-dimethylnaphthalene also has characteristics, and it can be dissolved in many organic solvents, such as ethanol, ether, etc. This characteristic makes it used in the field of organic synthesis, often as a reaction medium or a raw material for participating in the reaction.
In addition, the substance has a certain degree of volatility, and it will slowly evaporate into the air in an exposed environment. And its vapor is heavier than air, and it is easy to accumulate in low places. In case of open fire and high heat, it can cause combustion and explosion. Therefore, during storage and use, special attention should be paid to fire and explosion prevention, and proper safety measures should be taken. "

Alas! Now I want to talk about the chemical properties of 1 + -alkyne-2,4-dimethylnaphthalene, and it is said in ancient Chinese. This compound has the structure of alkynyl group and naphthalene ring and dimethyl group, and its properties are unique.
First of all, its alkynyl group, alkynyl group contains carbon-carbon three bonds, which are rich in electrons, so it has nucleophilic properties. When encountering electrophilic reagents, such as hydrogen halides, halogens, etc., it can react by addition. When adding to hydrogen halides, following the Markov rule, hydrogen is added to carbon containing more hydrogen, and halogen atoms are added to those containing less hydrogen. This alkynyl group can also complex with metal ions. If it encounters silver ions, it can form alkynyl silver precipitation. This is one of the characteristic reactions of alkynyl groups and can be used to identify.
Furthermore, the naphthalene ring is a fused ring aromatic hydrocarbon with aromatic properties. Its electron cloud distribution is uneven, and the electron cloud density at the α position is high, so the electrophilic substitution reaction easily occurs at the α position. It can nitrify and sulfonate with concentrated sulfuric acid, concentrated nitric acid, etc. And the naphthalene ring is more active than the benzene ring, and the reaction conditions are relatively mild.
The introduction of dimethyl can further increase the electron cloud density of the naphthalene ring due to the use of methyl as the power supply sub-group, enhance its nucleophilicity, and make the electro At the same time, steric hindrance also affects the selectivity of the reaction to a certain extent.
This 1 + -alkynyl-2,4-dimethylnaphthalene exhibits diverse chemical properties due to the synergistic effect of alkynyl, naphthalene ring and dimethyl, and has great potential for application in organic synthesis and other fields.

"Tiangong Kaiwu" says: "All dimethyl silicone oil has a wide range of uses. It has the effect of lubrication, which can reduce friction and loss in the operation of machinery, so that the equipment can run smoothly and not be damaged for a long time. And because of its stable chemical properties, it is also useful in the field of waterproofing. It can form a waterproof film and cover the surface of objects to prevent water from penetrating, such as building roofs and external walls. It can be applied to keep it dry for a long time and protected from flood erosion. In addition, in the electronics industry, dimethyl silicone oil can be used as an insulating medium to ensure the stable transmission of current between electronic components, avoid the risk of short circuits, and ensure the stable operation of equipment. And it is also indispensable in the daily chemical industry. Adding skin care products can increase the softness and texture of the product, make the skin feel smooth and delicate, and is a good product for beauty and skin care."

The method of making 1,3-pentadiene-2,4-dimethylbenzene is to first take a small amount of benzene and place it in the reactor. The reactor is dense and can withstand a certain amount of force.
Add a catalyst to the kettle. The common use of this catalyst, such as trichloride and other lewy acid catalysts, is controlled by the amount of the catalyst, so as to facilitate the benefit of the reaction.
Next, the methylation of pentadiene is introduced. The rate of introduction of pentadiene needs to be adjusted according to the reaction, such as resistance, resistance and catalytic activity. Methylation can be done with iodomethane, etc., and the amount of methylation can also be added according to the proportion of the reaction.
In the reverse process, the reaction speed is controlled. Generally speaking, this reaction should be performed in a low to medium temperature, such as between 0 ° C and 50 ° C. If the reaction speed is high, it is easy to cause side reaction generation, and the reaction speed is too high; if the reaction speed is low, the reaction rate is slow, and the consumption is too low.
The same, the reaction force also needs to be paid attention to. Usually, it can be reversed at a constant temperature or slightly higher than the normal temperature, so that the reaction can be fully connected and the reaction speed is accelerated.
When the reaction reaches the fixed temperature, and the reaction has been completed or reached the required reduction rate, the inversion is stopped.

, the inversion is separated. First, it can be extracted with a solution of 20%, such as ether, etc., and the anti-chemical mixture is extracted, and the anti-chemical substance is moved to the active phase. Then, the steps of washing with water, washing, etc. are used to remove the anti-chemical, such as the non-anti-chemical, catalytic, etc.
The best, by means of steaming, etc., the refined anti-chemical phase is collected, and the specific boiling is collected. The product of 1,3-pentadiene-2,4-dimethylbenzene is obtained. The whole process requires the operation of Zunhua to ensure safety and the amount of oil.

"Tiangong Kaiwu" states that when storing and transporting 1,3-pentadiene-2,4-dimethylbenzene, all matters should be treated with caution.
First, it concerns storage. This compound is active and easy to react with surrounding substances, so it must be stored in a cool, dry and well-ventilated place. If placed in a high temperature or humid place, it may deteriorate and affect quality and utility. And it should be kept away from fires and heat sources. Because of its flammability, there is a risk of explosion in case of open flames and hot topics. In addition, the storage container must be made of suitable materials to prevent chemical reactions with compounds, causing corrosion and damage to the container, causing the risk of leakage.
Second, transportation. Before transportation, it is necessary to understand its dangerous characteristics in detail, and properly pack it in accordance with relevant regulations and standards. The packaging should be solid and tight, which can effectively prevent vibration, collision and friction, so as to avoid damage to the container. During transportation, the transportation vehicle should be equipped with fire extinguishing equipment and leakage emergency treatment equipment to prevent accidents. Drivers and escorts also need professional training to be familiar with the characteristics of the compound and emergency treatment methods. During driving, avoid densely populated areas and high-temperature road sections, drive at a uniform speed, and avoid violent operations such as sudden braking and sharp turns to ensure safe transportation.
Therefore, in the storage and transportation of 1,3-pentadiene-2,4-dimethylbenzene, the above things should be done with caution to ensure its safety and stability.