3,5-Dihydroxybenzoic acid, also known as gentilic acid, has important uses in many fields such as medicine and chemical industry.
First, in the field of medicine, this is a key intermediate for the synthesis of various drugs. Taking antibacterial drugs as an example, they can be converted into compounds with antibacterial activity through specific chemical reactions, which have inhibitory and killing effects on common pathogens. For example, in the synthesis of cardiovascular drugs, it also plays an important role in the construction of drug molecular structures and helps drugs achieve the goal of regulating cardiovascular function. And modern studies have shown that 3,5-dihydroxybenzoic acid itself may have certain biological activities, which are beneficial to human health. For example, it may have antioxidant properties, can scavenge free radicals in the body, slow down oxidative damage to cells, and may have positive significance for preventing certain chronic diseases.
Second, in the chemical industry, it has a wide range of uses. In the synthesis of polymer materials, it can participate in the polymerization reaction as a functional monomer, giving the material special properties. For example, introducing it into the synthesis of polyester materials can improve the hydrophilicity and biocompatibility of the material, making the material more applicable in the field of biomedical engineering (such as tissue engineering scaffolds). In the dye industry, it can be used as a raw material to participate in dye synthesis, endowing dye molecules with specific structures and properties, so that dyes have better dyeing fastness and color stability.
Third, in the agricultural field, it may be developed as a plant growth regulator. By regulating the balance of hormones in plants, it affects the process of plant growth and development, such as promoting seed germination and improving crop stress resistance. In the face of drought, salinity and other adversity, crops treated with 3,5-dihydroxybenzoic acid may be better able to adapt to the environment and ensure yield and quality.

3,5-Diallyl salicylic acid is one of the organic compounds. Its physical properties are as follows:
Under normal conditions, it may be a white to light yellow crystalline powder, which is easy to identify and distinguish from other substances. In terms of odor, it may have a weak special odor, but its taste is not strong, not pungent and unpleasant.
When it comes to melting point, it is about a specific temperature range, which is crucial for identification and purity determination. The melting point of this substance with different purity may vary slightly.
In terms of solubility, it may exhibit a certain solubility in common organic solvents such as ethanol and acetone. Those that are soluble can form a uniform and dispersed system with it; those that are slightly soluble or insoluble are different from solvents and exhibit different phases. In water, its solubility is poor, because there are fewer hydrophilic groups in the molecular structure and more hydrophobic parts.
In addition, its density is also a specific value, which is related to the relationship between weight and volume of the substance. It needs to be taken into account when planning chemical production, storage and transportation.
Furthermore, the stability of the substance is also one of its physical properties. Under a suitable environment at room temperature and pressure, protected from light and moisture, it may be able to maintain a relatively stable chemical structure and physical form. However, in case of extreme conditions such as high temperature, strong light, and high humidity, or reactions such as decomposition and polymerization occur, the physical properties will change.

The synthesis method of 3,5-diallyl salicylic acid relies on the skills of organic chemistry. There are many methods, and each has its own advantages and disadvantages. The details are as follows:
First, salicylic acid is used as a base to react with allyl halides in an alkaline environment. First take salicylic acid and dissolve it in a suitable solvent, such as acetone, N, N-dimethylformamide. Next, add bases, such as potassium carbonate, sodium hydroxide, etc., to capture the hydrogen of salicylic acid to form salts and enhance nucleophilicity. Then slowly drop into allyl halides, such as allyl chloride and allyl bromide. This reaction requires temperature control, usually between room temperature and moderate heating, depending on the activity of the reactants and the properties of the solvent. After the reaction is completed, pure 3,5-diallyl salicylic acid is obtained by extraction, washing, drying, column chromatography or recrystallization.
Second, phenolic compounds are used as starting materials and are prepared by a series of reactions such as acylation and allylation. First, the phenolic compounds are acylated with acylating reagents, such as acetyl chloride and acetic anhydride, in the presence of catalysts, to obtain phenolic esters. Then the phenolic esters are treated with strong bases to cause Fries rearrangement to obtain ortho or p-hydroxyaromatic ketones. After the allylation reaction, allyl is introduced, and finally the target product is obtained through appropriate oxidation or other conversion steps. There are many steps in this route, but the reaction conditions can be flexibly adjusted to obtain higher yield and purity.
Third, the coupling reaction catalyzed by transition metals is used. For example, salicylic acid derivatives are used as substrates, and allyl borate or allyl halide are coupled with allyl borate or allyl halide under the action of transition metal catalysts and ligands such as palladium and nickel. This method has mild conditions and high selectivity, which can effectively reduce side reactions. However, the catalyst is expensive, and the reaction equipment and operation requirements are strict, resulting in high cost.
Synthesis of 3,5-diallyl salicylic acid, each method has its own application scenarios, according to the actual needs, consider the cost, yield, purity and other factors, choose the best method.

3% 2C5-diethylbenzoic acid is available in the market, and its price is variable, depending on supply and demand, quality, and origin.
In various shops, if it is an ordinary product, the supply is quite sufficient, but the one you want is not in stock, the price may be cheap. The price per catty, or between tens of dollars. However, if the quality is excellent, pure and refined, and it is needed for various industrial, medical, and other important tasks, the price will increase if the supply is a little scarce. The price per catty, or more than a hundred dollars, or even higher.
Furthermore, its price is also affected by the distance of the place of origin. If the product is close to the place where it is used, the freight will be saved, and the price may be appropriate; if the place of origin is far away, and the freight will be complex, the price will also increase accordingly.
In addition, the market conditions change, and the current price also changes. Merchants operate, and they also adjust their prices according to the situation. Therefore, if you want to know the exact price, you must carefully observe the market conditions of various cities and visit merchants, so that you can get a more accurate number. In short, the price is difficult to determine the exact value, and it mostly fluctuates in the range of tens to hundreds of dollars per catty.

3% 2C5-diethylbenzoic acid should be stored in a cool, dry and well-ventilated place. This substance may be potentially harmful to the environment and the human body, so it should be stored away from fire and heat sources and away from direct sunlight. Because of its flammability, flammable and combustible materials should be eliminated in the surrounding area, and should be stored separately from oxidants, acids and alkalis, and must not be mixed.
The storage site should be equipped with suitable materials to contain leaks. The storage container must be sealed to prevent it from volatilizing or reacting with air components. When taking and storing, the operator should take protective measures, such as wearing a self-priming filter gas mask (half mask), chemical safety glasses, anti-toxic infiltration work clothes and rubber oil-resistant gloves, etc., to avoid direct contact and damage to the body.
In addition, obvious safety warning signs should be set up in the storage area, and a special person should be responsible for regular inspections to check whether the container is damaged or leaked. Once any abnormalities are detected, proper handling measures should be taken immediately to ensure the safety of the storage environment and avoid safety accidents and environmental pollution.