2-chloropyridine-3-ol

The main uses of 2-% to-3-% are to create utensils, lighting for heating, and to remove evil spirits.
Since ancient times, the world has observed the wonders of 2-% to-3-%. In the case of utensils, it can generate high energy, so that gold and stone can be melted, and ordinary utensils can be formed. It is important to people's livelihood and daily life.
In terms of lighting and heating, in the dark night, 2-% of the light in the dark can break the darkness, remove the cold, and make the residence warm and bright.
Furthermore, in ancient times, it is common to use 2-% to cause evil. Whenever there is a problem or an ominous event, it can be burned to remove the dark and pray for peace. This idea is deeply rooted in the belief of the people, adding a general meaning to life.
Therefore, 2-% to the life of the ancients, the use of utensils, to daily life, and even spiritual beliefs, all play an important role, and it is indispensable.

What are the rational properties of 2-%-to-3-oxygen materials?

, and the color is not stinky. Its density is small, and it is the least dense thing in nature. Under normal conditions, it can be dissolved in water, and it can be reacted by many non-gold and part of the gold. In case of oxygen combustion, it will generate water, which will react to the heat, and put a lot of energy. This is also one of the major characteristics of high-energy fuels.
Oxygen is also stinky. The density is slightly higher than that of air, and it is slightly soluble in water. Oxygen is active, and it can be oxidized. Many substances can burn intensely in oxygen, such as burning in oxygen. Mars shoots four times, generating black tetroxide. Biological respiration also requires oxygen to oxidize substances and release energy for life.

It is flammable, and oxygen is combustible. The two are mutual and have their own characteristics. The energy contained in the reaction of oxygen has important uses in fields such as work and energy. Therefore, the physical and chemical properties of oxygen make it play an important role in nature and human life.

The chemical properties of 2-%-3-hydrazine are determined.
It is the first of the elements, and its sexual activity is normal. Under normal conditions, most of the atomic molecules (H ²) are present. It is flammable, mixed with oxygen, in case of open flame, high temperature, it is easy to explode and ignite, and the reaction is strong, and the water vapor is generated. It can also be used in many fields such as metallurgy, and it can be used to determine the activity of its chemical properties.
As for hydrazine, its chemical formula is N 2O H. This is the color oil liquid, which has a pungent ammonia smell. Hydrazine is original, and it can react to multiple oxides, releasing a lot of energy. Under normal conditions, it is slightly uncertain in terms of phase. However, in the event of oxidation, or the influence of external factors such as shock and shock, it can also cause severe reactions, or even explosions. If the hydrazine and dinitrogen tetroxide meet, it is a biochemical reaction, and it is a giant energy, which is often used in rocket launch. This is also a matter of its chemical activity, which is not determined.
For this, the chemical activity of the hydrazine phase is determined; if the hydrazine phase is slightly damaged, it is also uncertain. In case of specific parts, it can cause intense reactions.

To prepare ethyl dicyanopropionate, there are various methods.
One is the method of condensation of ethyl cyanoacetate with formaldehyde. Ethyl cyanoacetate has active α-hydrogen, which can be condensed with formaldehyde under the action of alkaline catalysts such as piperidine. During the process, the alkaline environment prompts the dissociation of α-hydrogen of ethyl cyanoacetate to generate carbonegative ions. This carbonegative ion nucleophilically attacks the carbonyl carbon of formaldehyde, and then through protonation and other steps, the precursor of ethyl dicyanopropionate can be obtained, and then after appropriate treatment, the target product can be obtained. This reaction condition is mild, the operation is relatively convenient, and the yield is also considerable.
The second method is to use diethyl malonate as the starting material. Diethyl malonate is first treated with alkali to form corresponding negative ions, and then nucleophilic substitution reaction with halogenated cyanide to introduce cyano groups. Then hydrolysis, decarboxylation and other series of reactions can obtain ethyl di- cyanopropionate. Although this path is slightly complicated, the raw materials are easy to obtain, and the reaction conditions of each step are relatively mature, and it is also used in industrial production.
The third can be obtained by the addition of ethyl acrylate and hydrogen cyanide. The carbon-carbon double bond of ethyl acrylate is electrophilic, and hydrogen cyanide can be nucleophilic added to it under the catalysis of an appropriate catalyst such as Lewis acid. During the reaction, the negative cyanide ions attack the carbon-carbon double bond, forming a carbon negative ion intermediate, which then binds protons to form ethyl di-cyanopropionate. However, hydrogen cyanide is highly toxic, so extra caution is required during operation, and strict protective measures are taken to ensure safety.
This method has advantages and disadvantages. In actual preparation, when considering factors such as raw material availability, cost, yield, and difficulty of operation, the choice is weighed to find the best synthesis path, so that the preparation of ethyl di-cyanopropionate is efficient, safe, and economical.

Mercury is extremely toxic. During storage and transportation, many matters must not be ignored.
When storing mercury, the first heavy container must be filled with a strong and sealed container to prevent the volatilization of mercury from escaping. Cover mercury is easy to vaporize, and its vapor is inhaled into the human body, which is very harmful and can damage the nervous and viscera systems. And the container must be placed in a cool place to avoid heat and direct sunlight, otherwise the temperature will rise and the volatilization of mercury will accelerate.
Furthermore, the place of storage should be well ventilated. Although it has been sealed, it is still difficult to escape slightly. Good ventilation can make mercury vapor dissipate in time without accumulating. However, the ventilated place should not be close to the water source where the crowd is dense, so as to prevent the harm and pollution source.
When transporting mercury, the packaging must be solid and reliable. In addition to the sealed container inside, a buffer protective material should be added to prevent collision damage. The person handling must wear protective gear, such as gloves, masks, protective clothing, etc., to avoid direct contact with mercury.
During transportation, the traffic should be stable, avoid sudden brakes and bumps, and avoid damage to the container. And the transportation route planning, when avoiding densely populated and prosperous areas, choose remote roads with few cars to reduce the danger of leakage. If it is unfortunate to leak, quickly leave the scene and the enclosed area, and strictly prohibit unrelated people from approaching. Quickly sprinkle sulfur powder on the leak to make mercury react with sulfur to form mercury sulfide to reduce toxicity, and then clean it up properly.
The storage and transportation of mercury is a matter of safety for everyone, and we must not slack off at all. Everything should be done with caution and follow regulations to keep it safe.