4-pyridinecarboxylic acid, 3-chloro-, methyl ester

Mercury is highly toxic, arsenic trioxide is also highly toxic, and the mixture of the two produces even more toxic substances. As for what kind of use it is used for, it is actually harmful to the world and goes against human relations, and it must not be done.
All things in the world have their inherent properties and uses. However, such highly toxic things should have been properly sealed and treated strictly to avoid harming life. If there are evil intentions, attempt to harm people or use them indiscriminately, they will be punished by God and will not be punished by the law.
Think of the ancient times, although there were traitors who tried to harm people with poison, they were eventually punished by justice. When we are in this world, we should respect morality and fear life, and we should not have evil thoughts in our hearts, trying to use such poisonous things to do inappropriate things. We must not make a big mistake out of a momentary desire, and it will be notorious forever.
Husband, all beings in the world are equal and deserve to be cared for. Hurting people with poisonous poison is the worst way to do it, harming others and not benefiting ourselves. We should treat all things with a heart of kindness, so that we can have peace and enjoy well-being. We must not touch the thoughts of such poisonous harm.

Mercury, commonly known as mercury, is the only metal that exists in a liquid state at room temperature and pressure. Its many physical properties are unique and of great significance to human cognition and application.
Mercury has a high density of about 13.59 grams per cubic centimeter, which makes it suitable for manufacturing densitometers. It can be used to accurately measure the density of liquids by the position of mercury in the tube.
Mercury has an extremely low melting point of -38.87 ° C and a boiling point of 356.6 ° C. Such a low melting point makes it a liquid at room temperature, which makes it widely used in the manufacture of thermometers. It can accurately measure temperature changes by means of the characteristics of mercury expansion and contraction when heated and cooled.
Mercury has good fluidity and high surface tension. It will form spherical droplets on a smooth plane, making it difficult to adhere to other objects. This property is crucial in some special experiments and industrial applications, such as the amalgamation process.
Mercury conductivity is also excellent, and it can be used to make electrical equipment such as electrodes. However, due to mercury toxicity, safety protection requirements are strict when used.
In addition, mercury vapor pressure is relatively high at room temperature, and mercury is volatile into mercury vapor. Mercury vapor is toxic and can seriously endanger human health. When using and storing mercury, strict protective and sealing measures must be taken to prevent mercury leakage and volatilization.
Ethyl acrylate is a colorless and transparent liquid with a special odor. Its physical properties are as follows:
The boiling point of ethyl acrylate is about 99 ° C. This boiling point determines that it is easy to change from liquid to gaseous state under specific temperature conditions. In chemical operations such as distillation and separation, it can be separated and purified according to this characteristic.
Its melting point is -71.2 ° C. The lower melting point makes it stable and liquid at room temperature, making it easy to transport and use.
The density of ethyl acrylate is about 0.9405 g/cm3, which is slightly smaller than that of water. When mixed with water, it will float on the water surface. This is an important consideration when treating wastewater containing ethyl acrylate or performing related extraction operations.
Ethyl acrylate is slightly soluble in water and soluble in organic solvents such as ethanol and ether. This solubility helps to select suitable solvents during the preparation of coatings and adhesives to achieve uniform dispersion and good performance.
In addition, ethyl acrylate has a certain volatility. During use, attention should be paid to ventilation to avoid the formation of a high-concentration steam environment. At the same time, because of its volatility, it should be sealed and stored during storage to prevent volatilization losses and cause safety hazards.

Mercury is a liquid metal, and at room temperature, it evaporates easily into mercury vapor, which is highly toxic. If inhaled, it can damage the viscera, hurt the brain, cause tremors in the limbs, and cause trance.
Ethyl acetate has a fragrant smell and is a colorless liquid. Its density is less than that of water, and it is difficult to dissolve in water. It can be miscible with various organic solvents such as alcohols and ethers.
In terms of its chemical properties, mercury is relatively stable, and it is difficult to react with common substances such as oxygen at room temperature. However, when heated, mercury can combine with oxidation to form mercury oxide. Mercury can also react rapidly with sulfur to form mercury sulfide. This property is often used in the treatment of mercury leakage to relieve mercury toxicity.
Ethyl acetate has hydrolysis properties and reacts with water under the catalysis of acids or bases. In an acidic environment, hydrolysis produces acetic acid and ethanol, and this reaction is reversible; in alkaline conditions, hydrolysis is more thorough, resulting in acetate and ethanol. In addition, ethyl acetate can participate in the alcoholysis reaction, exchanging alkoxy groups with alcohols to form new esters. It can also undergo a reduction reaction under certain conditions and be converted into corresponding alcohols. < Br >
Mercury and ethyl acetate, one is a metal and the other is an ester organic compound, have significant differences in chemical properties, and each has its own unique uses in many fields such as industry and scientific research. They must also be treated with caution to prevent harm to people and the environment.

To prepare ethyl 3-bromo-4-nitrobenzoate, the following methods can be followed:
First, ethyl benzoate is used as the starting material. First, ethyl benzoate is nitrified. In an appropriate reaction vessel, concentrated sulfuric acid and concentrated nitric acid are prepared into a mixed acid in a certain proportion. Under low temperature and stirring conditions, ethyl benzoate is slowly dropped into the mixed acid. This process requires strict temperature control, because excessive temperature can easily cause polynitro substitution side reactions. After the reaction, 4-nitrobenzoate can be obtained through neutralization, extraction, separation and other operations.
Then, 4-nitrobenzoate ethyl is brominated. Using carbon tetrachloride as a solvent, add an appropriate amount of ethyl 4-nitrobenzoate, add a brominating reagent such as bromine, and add a small amount of iron powder or iron tribromide as a catalyst. Under the condition of light or heating, bromine and ethyl 4-nitrobenzoate underwent a substitution reaction, mainly at the ortho-position of the nitro group on the benzene ring, to form ethyl 3-bromo-4-nitrobenzoate. After the reaction is completed, the solvent is removed by distillation, and then purified by column chromatography or recrystallization to obtain pure 3-bromo-4-nitrobenzoate. < Br >
In this way, the synthesis of ethyl 3-bromo-4-nitrobenzoate can be achieved through nitrification, bromination and subsequent separation and purification steps.

Mercury is a highly toxic substance, and copper acetyl arsenite must pay attention to many matters when storing and transporting it.
First, it is related to storage. Choose a cool, dry and well-ventilated place. Because mercury is volatile, it evaporates more rapidly in high temperature and humid environments, which will increase the concentration of mercury in the air and endanger the people around it. Copper acetyl arsenite is also afraid of moisture and is easily deteriorated by moisture, which affects its quality and stability. Furthermore, the storage place should be away from fire and heat sources, both of which are dangerous chemicals. In case of open flames, hot topics, or the risk of combustion or explosion. And it should be stored separately from acids, alkalis and oxidants. Mercury will react chemically with certain acids, and copper acetyl arsenite may also react dangerously when exposed to acids, alkalis or oxidants. In addition, there must be obvious warning signs in the storage place to remind everyone that there are dangerous chemicals here and do not touch them.
Second, it involves transportation. The means of transportation must be special and meet safety standards, and their airtightness must be good to prevent mercury volatilization and copper acetyl arsenite leakage. There are also requirements for transportation personnel, and they must be professionally trained to be familiar with the dangerous characteristics and emergency treatment methods of these two. During transportation, ensure that the packaging is intact to avoid package rupture due to bumps and collisions, resulting in leakage. In the event of a leak, emergency measures should be taken immediately to evacuate the surrounding population and isolate the contaminated area. Professionals should quickly collect and clean up the leak with appropriate materials and handle it properly to prevent the spread of pollution and endanger the environment and the safety of everyone.