Although 1,3-diene-5-carboxylbenzene did not directly mention this specific compound in "Tiangong Kaiwu", its possible uses can be deduced from the perspective of ancient technology and chemical cognition.
In traditional dyeing and weaving processes, compounds containing such structures may be used as intermediates of natural dyes. Ancient dyers knew well that pigments were extracted from various plants and minerals for fabric dyeing. If 1,3-diene-5-carboxylbenzene exists in some plant components, its special structure may be converted into bright and stable dyes through chemical reactions, adding color to silk, hemp and other fabrics to meet the needs of the ancients for diverse clothing colors.
In the field of ancient medicine, it may also have potential uses. Ancient healers often used natural substances as medicine, which were processed and combined to exert therapeutic effects. 1,3-diene-5-carboxylbenzene may have a regulatory effect on some diseases of the human body due to structural characteristics. For example, some compounds containing carboxyl groups and unsaturated bonds have anti-inflammatory and antibacterial activities. The ancients may have found their medicinal value in practice and explored it. After proper treatment, it can be used to treat sores, swelling, trauma and other diseases.
Furthermore, in the traditional fragrance making process, it may be used as one of the ingredients of fragrances. Ancient nobles and literati were quite particular about incense, and fragrances needed to have unique aroma and stability. If 1,3-diene-5-carboxybenzene has a special smell, it can be blended into incense to add a different flavor to incense, incense pills, etc., and create an elegant and pleasant atmosphere.

1% 2C3-diethyl-5-carboxypyridine, this physical property is as follows:
Its properties, under normal conditions, or white to slightly yellow crystalline powder, the appearance is fine, the quality is pure, the color is uniform, no variegation and foreign matter, or under light There may be a weak luster.
The melting point is quite critical, about [X] ℃, this value is an important indicator in the identification and purification of substances. Heating to this temperature, the substance begins to melt from solid to liquid, and the melting process is relatively smooth, without sharp changes. In terms of solubility, the solubility in water is limited and slightly soluble. There may be a small amount of dispersion in water and it is difficult to form a homogeneous solution. In organic solvents such as ethanol and acetone, the solubility is quite good, and it can be rapidly dispersed and dissolved to form a clear and transparent solution. This property is of great significance in its extraction, separation and solvent selection for chemical reactions.
Stability also needs attention. In normal temperature and humidity environments, the properties are relatively stable and can be stored for a long time without significant deterioration. In case of strong acids, strong bases, or in high temperature, high humidity, and strong oxidation environments, the chemical structure may change, resulting in changes in properties.
Volatility is weak, and it is difficult to volatilize into the air at room temperature. Therefore, in conventional storage and use scenarios, there is no need to worry about loss due to volatilization or environmental problems.
In addition, the substance has certain chemical activity and can participate in a variety of chemical reactions under specific conditions, such as esterification, substitution, etc., which is why it is widely used in the field of organic synthesis.
The above physical properties are expected to help you in the research and application of this substance.

The chemical properties of 1% 2C3-diene-5-carboxylbenzene are as follows:
This compound has a conjugated diene structure. In organic reactions, conjugated dienes are very active. Taking the Diels-Alder reaction as an example, it can form a hexamembered cyclic compound with a dienophile. Due to the presence of a conjugated system, electron delocalization increases the stability of the molecule, and also affects its reactivity and selectivity.
Furthermore, the presence of a 5-carboxyl group imparts acidity to the compound. The carboxyl group can ionize hydrogen ions, which can neutralize with bases to form corresponding carboxylate and water. If reacted with sodium hydroxide, sodium carboxylate and water can be obtained. And the carboxyl group can participate in the esterification reaction, react with alcohol under acid catalysis to form esters and water. For example, with ethanol under concentrated sulfuric acid catalysis and heating conditions, the corresponding esters and water are formed.
In addition, the benzene ring in the compound also has unique chemical properties. The benzene ring is stable and prone to electrophilic substitution reactions, such as halogenation, nitrification, sulfonation, etc. For example, when reacted with bromine under iron catalysis, bromine atoms replace hydrogen atoms on the benzene ring to form brominated products.
From the perspective of the whole molecule, different functional groups may interact with each other. The conjugated diene system may affect the acidity of the carboxyl group and the electrophilic substitution activity of the benzene ring; conversely, the carboxyl group and the benzene ring may also The synergy of functional groups makes 1% 2C3-diene-5-carboxybenzene exhibit rich and diverse chemical properties, which has potential application value in organic synthesis, medicinal chemistry and other fields.

The manufacturing method of 1% 2C3-diene-5-carboxylbenzene is a delicate chemical technique. From the perspective of "Tiangong Kaiwu", the preparation of this compound, or the chemical synthesis concept of ancient methods, can achieve exquisite results.
To prepare 1% 2C3-diene-5-carboxylbenzene, the first selection of raw materials. When starting with suitable benzene derivatives, its purity and characteristics are related to the quality of the product. This raw material needs to have good reactivity in order to be successfully converted in subsequent steps.
After that, specific chemical reaction steps are often used to achieve the goal. One, or a substitution reaction. Select an appropriate reagent, and under suitable reaction conditions, such as specific temperature, pressure and catalyst, the reagent will be substituted with the specific position of the starting material to introduce the desired functional group. This step requires precise control of the reaction conditions to ensure that the position and degree of substitution are in line with expectations. If the temperature is too high or too low, it may lead to the occurrence of side reactions and affect the purity of the product.
Second, or an addition reaction is involved. When the raw material is modified by substitution, an unsaturated bond can be introduced, and then a suitable addition reagent can be used to add the unsaturated bond to the reagent under the catalysis of the catalyst to construct the structure of 1% 2C3-diene. In this process, the choice of catalyst is crucial, and different catalysts may affect the reaction rate and selectivity.
Third, the introduction of carboxyl groups is also key. Specific groups can be oxidized to carboxylic groups through oxidation reactions. This oxidation process requires careful operation, due to excessive oxidation or structural damage of the product. Select a mild oxidizing agent and precisely control the reaction time and conditions to successfully introduce carboxylic groups to achieve the preparation of 1% 2C3-diene-5-carboxylbenzene.
After each step of the reaction, fine separation and purification steps are required. Impurities in the reaction system are removed by distillation, extraction, recrystallization and other methods to improve the purity of the product. Through this series of steps, 1% 2C3-diene-5-carboxybenzene with high purity may be obtained.

When storing and transporting 1% 2C3-diene-5-carboxybenzene, be sure to pay attention to the following things:
First, this substance has a specific chemical activity and has strict requirements on the temperature and humidity of the storage environment. The temperature should be controlled in a specific range. If it is too high, it may cause chemical reactions or even deterioration; if the humidity is too high, it may cause deliquescence and other conditions. Therefore, the storage place should be dry and cool, and a well-ventilated place should be selected to avoid the risk of excessive local temperature and humidity.
Second, because its chemical structure contains special functional groups, or reacts with many substances. When storing, be sure to avoid co-storage with oxidizing, reducing substances and strong acids and alkalis to prevent dangerous chemical reactions, such as violent reactions, fires and explosions.
Third, when transporting, the packaging must be firm. Choose suitable packaging materials to ensure that the packaging is not damaged due to bumps and collisions during transportation, which may cause leakage. Once leaked, it will not only damage the substance, but also pose a threat to the environment and the safety of surrounding personnel.
Fourth, during handling, operators need to take protective measures. Wear appropriate protective equipment, such as gloves, goggles, protective clothing, etc., to prevent the substance from coming into contact with the skin and eyes. Accidental contact may cause irritation and injury to the human body.
Fifth, whether it is storage or transportation, it should strictly follow relevant regulations and standards. Keep clear and complete records, covering key information such as warehousing time, quantity, storage conditions, etc., for traceability and management to ensure compliance and safety of the entire process.