3,5-Diene-1,2-ethylene oxide, that is, limonene oxide, which is difficult to describe accurately in the era mentioned in "Tiangong Kaiwu", but today's chemical knowledge is related to ancient process records, and its use can be deduced.
In ancient times, although its exact chemical structure is not known, it contains natural products with such structures, or is useful in the preparation of fragrances and medicines. "Tiangong Kaiwu" records the extraction and application of many natural products. In the perfume extraction process, substances containing alkene and epoxy structures may be important components of fragrances. Because of its special odor and volatility, it can be used to prepare incense recipes, increase the richness and durability of fragrance.
In medicine, ancient times have a deep understanding of the medicinal value of natural products. Natural products containing 3,5-diene-1,2-ethylene oxide structures may have certain biological activities. After long-term practice, ancient people found that certain plant extracts can cure diseases. Such structures may be one of the active ingredients, or participate in pharmacological effects, such as anti-inflammatory and antibacterial, etc., to help relieve diseases.
Although 3,5-diene-1,2-ethylene oxide is not directly described in Tiangong Kaiwu, it may play an important role in the preparation of ancient flavors and medicines, reflecting the ancient wisdom of the ancient people's exploration of the properties and applications of natural products, and laying the foundation for the development of later chemistry and technology.

3,5-Diene-1,2-ethylene oxide, that is, 3,5-divinyl ethylene oxide, is widely used in the field of organic synthesis. The following is the synthesis method:
First, the allyl alcohol derivative is used as the starting material. First, the allyl alcohol is properly protected to avoid the interference of hydroxyl groups in the subsequent reaction. After that, through the nucleophilic substitution reaction, a suitable halogenated hydrocarbon is introduced to construct a halide with an allyl structure. Subsequently, the strong base action is used to promote the intramolecular elimination reaction of the halide to form a double bond structure. Finally, under the action of peroxide or a specific catalyst, the cyclic oxidation reaction of the double bond is realized, thereby preparing 3,5-diene-1,2-ethylene oxide. The advantage of this route is that the starting material allyl alcohol is relatively common, and the reaction conditions of each step are relatively mild and easy to control, but the steps are slightly cumbersome, and the yield of each step needs to be carefully controlled.
Second, conjugated diolefins and ethylene oxide derivatives are used as raw materials. Under the catalysis of Lewis acid or transition metal catalyst, conjugated diolefins and ethylene oxide derivatives undergo [2 + 2] cycloaddition reaction. The reaction cleverly uses the reactivity of conjugated diolefins and the ring tension of ethylene oxide derivatives to construct the basic skeleton of the target product in one step. This method has short reaction steps and high atomic economy, but it requires harsh reaction conditions. The choice and dosage of catalysts need to be precisely regulated, and the preparation of raw material ethylene oxide derivatives may be difficult.
Third, acetylene derivatives are used as raw materials. First, acetylene is selectively added to prepare a compound containing two alkenyl groups. Then, the alkenyl groups are properly functionalized to create conditions for subsequent epoxidation reactions. Finally, the construction of ethylene oxide rings is completed through epoxidation reagents. This method has a wide range of raw materials acetylene and can flexibly introduce different substituents, which is beneficial to the structural modification of the product. However, the reaction process requires precise control of the addition position and reaction conditions, which requires high experimental skills.

3,5-Diethyl-1,2-phthalic anhydride is an organic compound. Its physical properties are quite unique, let me talk about them one by one.
Looking at its appearance, it is often in the state of white to light yellow crystalline powder, which makes it different in many scenes. Its melting point is about 43-46 degrees Celsius, and this melting point characteristic is of great significance in the process of heating changes. When the temperature rises near the melting point, it will gradually melt from solid to liquid state, which has a profound impact on the heating and forming of chemical production.
Furthermore, its boiling point is about 295 degrees Celsius, and a higher boiling point indicates that more energy needs to be supplied to make it boil and vaporize. This property is crucial in operations such as distillation and separation, and can be used to control temperature to achieve phase separation from other substances with different boiling points.
3,5-diethyl-1,2-phthalic anhydride also has characteristics of solubility in organic solvents. It is soluble in some common organic solvents, such as acetone, toluene, etc. This solubility paves the way for its application in coatings, inks, adhesives, etc. In the preparation of coatings, its solubility in organic solvents can be used to disperse uniformly in the system, giving the coating good properties.
However, its solubility in water is very small, which is related to the lack of hydrophilic groups in the molecular structure. This property also determines its behavior in water-related environments. In aqueous systems, it is difficult to mix with water, but it can perform its functions in oil-phase or non-aqueous systems.
In addition, this compound is sublimative, and under specific temperature and pressure conditions, it can be directly converted from solid to gaseous state. This sublimation property may be exploited in specific purification or separation processes to achieve purification of substances through sublimation processes.

3,5-Diene-1,2-propylene oxide, this is an organic compound. When storing and transporting, many key matters must be paid attention to.
First, temperature control is extremely important. Because it is very sensitive to temperature, high temperature is prone to chemical reactions, triggering decomposition, polymerization, etc., which in turn affects its quality and stability. Therefore, the storage place should be a cool and well-ventilated place, and the temperature should be maintained within a specific range to prevent the temperature from being too high.
Second, the source of ignition and oxidant must be strictly isolated. This compound is flammable, and it is easy to burn when exposed to open flames and hot topics, and will react violently when in contact with oxidants, and even cause explosions. Therefore, fireworks are strictly prohibited in the storage and transportation areas. At the same time, they should be stored separately from oxidants, and cannot be mixed in storage and transportation.
Third, pay attention to the integrity of the packaging. The packaging must be tight to prevent leakage. Once leakage occurs, not only will material loss be caused, but also the volatile gas will pollute the environment and be harmful to human health. During transportation, ensure that the packaging is not squeezed or collided to avoid damage.
Fourth, take protective measures. When the operator comes into contact with this object, he should wear appropriate protective equipment, such as protective clothing, gloves, goggles, etc., to avoid skin contact and inhalation of volatile gases. If it is accidentally touched, it should be dealt with immediately according to the corresponding first aid measures.
Fifth, follow relevant regulations and standards. Whether it is storage or transportation, it must strictly comply with the safety regulations and standards formulated by the state and the industry to ensure legal operation compliance and ensure personnel safety and environmental safety.

In today's world, business conditions are complex, and the market is prone to change. It is not easy to know the market price of 3,5-diene-1,2-propylene oxide.
This chemical substance is widely used and indispensable in all industrial fields. The change in its price is influenced by various factors. The first to bear the brunt is the situation of supply and demand. If there is a lot of demand in the market, and the supply is small, the price will rise; on the contrary, if the supply exceeds the demand, the price will drop.
Furthermore, the price of raw materials is also the key. The production of 3,5-diene-1,2-propylene oxide requires specific raw materials, and the fluctuation of the price of raw materials will necessarily cause its price to fluctuate. If the price of raw materials rises due to natural disasters, man-made disasters, political regulations, etc., the price of finished products will also rise.
In addition, the new process, the intensity of competition, and the guidance of policies all have a significant impact on its price. New processes can reduce its manufacturing costs, or cause prices to fall; market competition intensifies, and various businesses compete for market share, or have price reductions; and policy encouragement or restrictions can also make prices different.
If you want to know the current market price, you need to visit a chemical trading house, consult a senior person in the industry, or look at trading platforms and industry reports to get a more accurate price. And the price may vary depending on the quality, quantity, and distance of the place. Therefore, if you want to know the accurate market price, you should investigate it carefully and verify it in many ways.