Ethyl 4-2-aminobenzoate, also known as benzocaine, is a commonly used chemical compound. Its chemical properties are specific, and the following will be described by you.
First of all, it is weakly acidic. Because the molecule contains a carboxyl group (- COOH), this carboxyl group can be solved into a hydrogen group (H), and it is acidic. However, its acidic acid, such as acid and sulfuric acid, is much weaker. This weak acidity makes 4-2-aminobenzoic acid ethyl ester under specific conditions, which can neutralize and react to generate water.
Secondly, its amino group (-NH ²) is acidic. The nitrogen atom of the amino group has a solitary ion, which can accept the ion, so it is resistant. It is 4-ethyl-2-aminobenzoate that can react to the acid, resulting in the reaction of the acid. This property makes it appear different in the acid environment.
Furthermore, 4-ethyl-2-aminobenzoate has the typical properties of ester compounds due to its ester group (-COO -), that is, it can generate hydrolysis reactions. In acidic or acidic parts, ester groups can be cracked. Hydrolysis under acidic components yields 4-2-aminobenzoic acid ethanol, while hydrolysis under acidic components yields 4-2-aminobenzoic acid ethanol, and the hydrolysis under acidic components is even lower.
In addition, its benzene content is determined by a certain degree of molecular characterization. The benzene content is common, and the distribution of the benzene clouds is average, so that the 4-2-aminobenzoic acid ethyl ester phase is fixed, and it is not easy to be oxidized or produce other strong reactions. However, benzene can also be produced, such as benzene substitution reactions, etc., because of its high density of the benzene clouds, it is easy to attract heat.
Therefore, the chemical properties of ethyl 4-2-aminobenzoate are determined by the carboxyl group, amino group, ester group and benzene group it contains. These properties make it useful in various fields such as synthesis and synthesis.

Ethyl 4-hydroxy- 2-aminobenzoate, this substance is an organic compound, and its physical properties are quite characteristic.
Looking at its shape, at room temperature, it is mostly white to slightly yellow crystalline powder, delicate and uniform, with a light texture, just like a delicate frost powder, placed in the palm, like soft sand, but more dense.
When it comes to the melting point, its melting point is about [X] ° C. When the temperature gradually rises to this point, the originally solid crystal, like ice and snow in the warm sun, slowly melts into a flowing liquid, showing a crystal clear state. The boiling point is around [X] ° C. At this high temperature, the liquid turns into a curl of steam and dissipates invisibly in the air.
In terms of solubility, it is easily dissolved in organic solvents such as ethanol and ether, just like fish entering water, and fuses with the solvent to form a uniform solution. However, its solubility in water is not good, just like oil dripping into water, it is difficult to fuse, and it is mostly suspended or precipitated in water.
Its density is about [X] g/cm ³. Although its exact value is difficult to distinguish with the naked eye, compared with common substances, this density gives it a unique physical behavior to a certain extent. In some mixed systems, due to the density, it either settles at the bottom or is suspended in a specific position, which affects the physical state of the entire system.
Furthermore, this material has a certain degree of hygroscopicity. In a high humidity environment, it is like a sponge absorbing water, slowly absorbing water vapor in the air, causing its own weight to increase, and its shape may also change slightly. It gradually becomes moist from a dry powder.
In addition, its stability may be affected under light conditions. Long-term strong light exposure or photochemical reactions may cause it to change in color, shape and chemical structure. Therefore, when stored, it is often necessary to place it in a cool and dark place to prevent deterioration.

Ethyl 4-hydroxyl-2-aminobenzoate has many main uses.
In the field of medicine, this compound is often a key intermediate. By means of chemical synthesis, complex drug molecular structures can be constructed. For example, the preparation of some antipyretic and analgesic drugs, ethyl 4-hydroxyl-2-aminobenzoate participates in it, laying the foundation for the synthesis of drugs with specific efficacy and pharmacological activity. Because of its specific functional groups, it can react precisely with other chemicals to generate molecular structures that meet the requirements of drug design, which helps to improve the therapeutic effect and safety of drugs.
In the dye industry, it is also an important raw material. Its molecular structure gives it unique advantages in the synthesis of dyes, and it can participate in the synthesis of a variety of bright colors and good stability dyes. With its chemical properties, it can be combined with different chromophores to generate dye products with specific colors and dyeing properties through a series of chemical reactions. It is widely used in textile, printing and dyeing industries to give long-lasting and bright colors to fabrics.
Furthermore, in the field of cosmetics, ethyl 4-hydroxyl-2-aminobenzoate is also used. Due to its certain characteristics, it can be added as a functional ingredient in skin care products and cosmetics. For example, it may have certain antioxidant or gentle conditioning effects on the skin, help improve the efficacy of cosmetics, improve the care and maintenance performance of products on the skin, and bring consumers a better experience.
To sum up, ethyl 4-hydroxyl-2-aminobenzoate plays an indispensable role in many industries such as medicine, dyes, cosmetics, etc. with its unique chemical structure and properties, and is of great significance to promoting Product Research & Development and innovation in these industries.

To make ethyl 4-ene-2-aminobutyrate, follow the following ancient method:
First take an appropriate amount of butenediic anhydride and place it in a clean kettle. Take alcohol as the solvent, often choose ethanol, and put it in an appropriate proportion. Add a little catalyst, such as p-toluenesulfonic acid, in an amount of about one or two percent of the reaction material. Heat up to a moderate temperature of about 60-70 degrees Celsius, maintain this temperature, and let it react. This step aims to esterify butenediic anhydride with ethanol to obtain diethyl butenediate.
When the reaction is complete, cool the reaction solution. Take another kettle, put in sodium metal, and slowly add ethanol to make a sodium ethanol solution. When the sodium is completely reacted, pour the previously prepared diethyl butenediate into this sodium ethanol solution. Warm up to 40-50 degrees Celsius and continue to stir. At this time, diethyl butenediate undergoes intramolecular condensation under the action of sodium ethanol to form a cyclic intermediate.
After that, ammonia gas is introduced into the system. Ammonia reacts with cyclic intermediates and gradually introduces amino groups through processes such as ring opening and substitution. Control the reaction conditions, the temperature should be 30-40 degrees Celsius, and the pressure is slightly higher than normal pressure.
After the reaction is completed, neutralize the system with dilute acids, such as dilute hydrochloric acid, to make the solution neutral. Then perform liquid separation and take the organic phase. The organic phase was dried with anhydrous sodium sulfate, the desiccant was filtered off, and then distilled under reduced pressure to collect a fraction within a specific temperature range, which is ethyl 4-ene-2-aminobutyrate. This process requires careful control of the reaction conditions at each step to obtain a high-purity product.

For ethyl 4-meta-2-aminophenylacetate, many matters need to be paid attention to during storage and transportation.
When storing, the temperature and humidity of the environment are the first priority. This substance should be stored in a cool and dry place, away from high temperature and humidity. High temperature can easily cause its chemical properties to change, or cause reactions such as decomposition; humid environment may make it absorb moisture, affecting purity and quality. Therefore, in the warehouse, temperature and humidity control equipment is indispensable to ensure the suitability of the environment.
Furthermore, protection from light is also the key. 4-meta-2-aminophenylacetate ethyl ester is more sensitive to light, and long-term light may cause it to undergo photochemical reactions, resulting in structural changes and reduced activity. Therefore, opaque packaging materials should be used or stored in containers protected from light to ensure that the substance is not disturbed by light.
As for transportation, the stability of the packaging is crucial. Appropriate packaging materials need to be selected to prevent the substance from being damaged by collision and extrusion during transportation. At the same time, ensure that the packaging is tight to prevent leakage. Because it has certain chemical properties, if it leaks, it may pose a hazard to the environment and transportation personnel.
The temperature during transportation also needs to be controlled. According to its characteristics, it may need to be transported by cold chain, or pay attention to heat insulation at ordinary temperature. If the temperature is out of control, the quality and performance of the substance may be damaged.
In addition, transport personnel should have a good understanding of the properties of 4-dip-2-aminophenylacetate and know how to deal with emergencies. In the event of an emergency such as a leak, they can respond quickly and properly to reduce losses and hazards. In short, the storage and transportation of 4-dip-2-aminophenylacetate requires thorough consideration of all factors to ensure its quality and safety.