3-Hydroxy-1,2-diethyl ether, also known as ethylene glycol monoethyl ether, its main uses are as follows:
This substance is widely used in the industrial field. In the coating industry, it is a very critical solvent. Due to its good solubility, it can effectively dissolve a variety of resins, such as nitrocellulose, alkyd resins, etc., to help the coating disperse evenly, improve the construction performance and leveling of the coating, and make the coated surface smoother. It is widely used in automotive paints, furniture paints, coil coatings and many other paint varieties.
In the field of inks, 3-hydroxyl-1,2-diethyl ether also plays an important role. It can be used as an ink solvent to enhance the adhesion of the ink to the printing material, ensure the smooth transfer and drying of the ink during the printing process, and then improve the printing quality. It is often used in offset printing inks, gravure inks, etc.
In addition, in the electronics industry, it also has a place. Because of its good cleaning effect on some electronic components and will not cause damage to the components such as corrosion, it is often used to clean electronic parts, remove oil, dust and other impurities, and ensure the normal operation of electronic equipment.
In the dye industry, 3-hydroxyl-1,2-diethyl ether can be used as a solvent and diluent for dyes to assist in uniform coloring of dyes and improve the uniformity and vividness of dyeing. At the same time, in some organic synthesis reactions, it can also serve as a reaction medium, providing a suitable environment for chemical reactions and promoting the smooth progress of the reaction.

3-Bromo-1,2-diethylbenzene is an organic compound, and its physical properties are quite unique. Although it is hard to find any trace in ancient books, it can be explained from the scientific perspective of today.
It is liquid at room temperature, similar to the ancient "oily spiritual liquid", with a special smell, similar to the strange and fragrant smell contained in ancient books, but this smell is not pleasant and fragrant, or makes the person frown. Its density is heavier than water, just like the ancient "sinking gold in water", when poured into water, it will sink to the bottom.
3-Bromo-1,2-diethylbenzene is insoluble in water, just like the ancient "oil and water are incompatible", and the two are difficult to blend and mix. But it can be easily dissolved in organic solvents, just like the ancient "medicine into alcohol", and can be uniformly dispersed in organic solvents such as ethanol and ether.
The boiling point and melting point of this compound are also key physical properties. The boiling point is like the ancient "refining thing, which gasifies at a specific temperature". At a specific temperature, 3-bromo-1,2-diethylbenzene will change from liquid to gaseous state. The melting point is like "when it is cold to a certain degree, the liquid condenses into a solid state", and when the temperature drops to a certain extent, it will solidify into a solid state.
Its appearance may be a colorless to light yellow liquid, like the ancient "light yellow jade liquid". Under light, it may have a unique luster, like an ancient treasure shining brightly.
The physical properties of 3-bromo-1,2-diethylbenzene, although not accurately described by the ancients, can be seen in today's cognition, with the help of ancient common sense and metaphors, one or two of its characteristics can be glimpsed, and future generations can explore its mysteries more deeply.

The physical properties of 3-propargyl-1,2-diethyl ester are not stable. Its alkynyl activity makes it easy to initiate an addition reaction when encountering specific reagents. If it is an electrophilic reagent, the π electron cloud of the alkyne bond is attracted by it, causing the carbon-carbon triple bond to break and add, making its structure easier.
And its ester group, in an acid-base environment, the risk of hydrolysis is quite high. In an acidic medium, through protonation, water attacks carbonyl carbon, progressive alcohols and carboxylic acids; in an alkaline environment, hydroxide ions nucleophilically attack carbonyl carbon, forming carboxylic salts and alcohols, which can cause the original structure to be destroyed.
And 3-propargyl-1,2-diethyl ester contains unsaturated bonds, so there is also a risk of oxidation. In case of strong oxidizing agents, alkynyl bonds or ester groups can be oxidized, resulting in molecular structure changes and physical properties are also different.
Therefore, from a comprehensive perspective, the chemical properties of 3-propargyl-1,2-diethyl ester are not stable due to the characteristics of alkynyl groups and ester groups. Under certain conditions, it is easy to react and cause structure and properties to change.

To prepare 3-bromo-1,2-dimethyl benzene, the following methods can be used:
First, 1, 2-dimethyl benzene is used as the starting material and obtained by bromination reaction. This reaction requires iron or iron tribromide as the catalyst, and 1,2-dimethyl benzene interacts with bromine elemental phase at room temperature or slightly warmed state. The adjacent and para-sites of the capphenyl ring are affected by methyl, and the electron cloud density increases, and the bromine atom is easy to electrophilically attack the adjacent and para-sites. However, due to the steric hindrance, the substitution of methyl ortho-sites is slightly difficult. However, the reaction conditions are controlled, and a certain amount of 3-bromo-1,2-dimethyl benzene can be obtained. The reaction mechanism is as follows: the bromine molecule is polarized under the action of the catalyst to generate positive bromine ions, which then attack the benzene ring, form a sigma-complex, and then lose protons to obtain the product.
Second, 1,2-dimethyl benzene can be nitrified first to obtain 2,3-dimethyl nitrobenzene, and then reduced to convert the nitro group into an amino group to obtain 2,3-dimethyl aniline. Afterwards, the diazotization reaction is used to convert the amino group into a diazonium salt with sodium nitrite and hydrochloric acid, and then interact with cuprous bromide, and the diazonium group is replaced by a bromine atom to obtain 3-bromo-1,2-dimethyl benzene. Although this approach is complex, it has good selectivity and can effectively obtain the target product.
Third, it can also be alkylated by Fu-g. First, 1,2-dimethylbenzene is prepared with suitable halogenated hydrocarbons and benzene under the catalysis of Lewis acid. The unreacted benzene can be removed by distillation. Then, as in the first method, the bromination reaction is carried out to obtain 3-bromo-1,2-dimethylbenzene. In this Fu-g alkylation reaction, the halogenated hydrocarbons are catalyzed by Lewis acid to generate carbon positive ions and attack the benzene ring to form new carbon-carbon bonds.
All methods have their own advantages and disadvantages. The actual preparation needs to be based on the availability, cost, yield and purity of the raw materials. Choose the best one and follow it.

When storing and transporting 3-hydroxypropyl-1,2-diethyl ester, be sure to pay attention to the following things:
First, be careful to prevent it from coming into contact with fire and heat sources. This substance is flammable, and it is easy to cause combustion in case of open flames and hot topics. Therefore, in the place of storage, fireworks should be strictly prohibited, and all kinds of electrical equipment should be ensured to meet the standards of explosion protection to prevent ignition due to electric sparks and other factors.
Second, pay attention to moisture prevention. After the substance is damp, it may cause quality deterioration or even deterioration. It should be stored in a dry and well-ventilated place, and the ground should be raised to prevent moisture erosion on the ground. The packaging must also be tight to prevent moisture from penetrating.
Third, avoid mixing with oxidizing substances. Oxidizing substances are highly oxidizing and may cause violent chemical reactions such as combustion and explosion when they meet 3-hydroxypropyl-1,2-diethyl ester. Oxidizing substances such as potassium permanganate and hydrogen peroxide should not be placed in the same place as 3-hydroxypropyl-1,2-diethyl ester.
Fourth, carefully check the packaging container. Before storage and transportation, check the packaging carefully for damage or leakage. If the packaging is damaged, the substance may leak, which will not only cause material loss, but also cause pollution to the surrounding environment. If it encounters an open flame, it may also cause a fire.
Fifth, when transporting, choose a suitable means of transportation and follow relevant transportation regulations. Transportation vehicles should be equipped with necessary fire-fighting equipment and leakage emergency treatment equipment. And regular inspections should be made during transportation to prevent unexpected situations.
Sixth, operators need to take protective measures. When coming into contact with this object, they should wear protective gloves, protective clothing, protective glasses, etc., to avoid direct contact with the skin and eyes. If you come into contact accidentally, rinse with plenty of water immediately and seek medical treatment in time.