2 Iodo 4 Chloroaniline

Cyanic acid is a toxic compound. Its physical properties are very specific.




























< It can dissolve in water, so if cyanic acid leaks into the water source, it can quickly pollute a large area of water. And its solubility in soluble water also makes it easier to disperse in chemical production and so on.
In terms of density, the density of cyanic acid is slightly smaller in water. This property affects its distribution under conditions such as leakage, and it floats in water, increasing the reliability.
In other words, cyanic acid needs to be used and stored with caution because of its low boiling temperature, ease of burning, solubility in multiple substances, and specific densities. A little carelessness may cause it to become large, endangering life and safety.

Mercury bromide red, also known as red mercury, is a disinfectant and antiseptic commonly used in surgery. Its chemical properties have many characteristics.
Mercury bromide red is a disodium salt of organic mercury, containing mercury elements. This material is usually a dark red crystal or auburn powder with fluorescence, which is easily soluble in water, slightly soluble in ethanol and acetone, and insoluble in chloroform and ether. Its aqueous solution is cherry red or dark red, and it shows green fluorescence when diluted. In case of dilute inorganic acid, it precipitates.
In terms of chemical structure, the molecular structure of mercury bromide red contains mercury atoms, which is the key to its disinfection and sterilization. Mercury ions can be combined with the sulfhydryl group of bacterial proteins to coagulate the protein, thereby inhibiting and killing bacteria, and has significant functions in preventing and treating infections of skin mucosal wounds.
However, the chemical properties of mercury bromine red also have limitations. Due to its mercury content, mercury is a heavy metal. If used for a long time or in large quantities, mercury ions may be absorbed and accumulated by the human body, causing mercury poisoning and damage to the human nervous system and kidneys. With the development of medicine and in-depth understanding, in view of its potential harm, its application has gradually decreased.

"Tiangong Kaiwu" has a saying: "Where gunpowder, sulfur is pure yang, and nitrate is pure yin, this universe hallucinates a god." 2 - Medicine (sulfur) 4 - Nitrate (fire nitrate) is the main ingredient of black powder. The main uses of black powder are probably three.
One is used in the military. Since the appearance of black powder, the state of war has changed. In the past, cold weapons fought, relying only on the power of the sharp edge. Black powder is used for firearms, such as guns, artillery and the like. Guns can shoot enemy soldiers from a distance. In the battle, they are unexpected and make the enemy difficult to defend against. Artillery is even more powerful. When attacking the city, they can collapse the city wall and break the enemy's stronghold. In the military, it can turn the tide of war, influence the trend of victory and defeat, and has a far-reaching impact.
Second, it is used for fireworks. Every festival day, fireworks take off, colorful, illuminating the night sky. Black powder is used in fireworks, which is the driving force for liftoff and bloom. Through the ingenuity of craftsmen, black powder can be combined with different medicinal materials to produce different colors and shapes. Or like flowers in full bloom, or like meteors flying, adding a festive and joyous atmosphere to the festival, pleasing the eyes of the audience, and becoming an important form of folk traditional entertainment.
Third, it is used for mining. In mines, if you want to get ore, you used to rely on manpower to cut it, which was time-consuming and laborious. Black powder is used in mining, with its explosive power, cracking rocks, making ore easy to mine. This method greatly improves the efficiency of mining, promotes the development of mining, and provides rich raw materials for subsequent industries such as metallurgy. In the process of industrial development, it also plays an important role.
is a black powder composed of 2-medicine 4-nitrate. It has significant uses in military, entertainment, industry and many other fields, adding a strong color to the development of human civilization.

2-% E7% A2% 98-4-%E6%B0%AF%E8%8B%AF%E8%83%BA, there are many ways to synthesize it.
First, the reaction of halogenated alkanes with diethyl malonate is the basis. First, the halogenated alkane and diethyl malonate are nucleophilic substituted under the action of alkaline reagents such as sodium alcohol. The methylene hydrogen of diethyl malonate is acidic, and sodium alcohol can grab its hydrogen to generate a carbonyl anion. This carbonyl anion has strong nucleophilicity and can attack the halogenated atom of the halogenated alkane to connect to the carbon to form a new carbon-carbon bond. After that, the product can be hydrolyzed and decarboxylated to obtain the 4-halogenated benzoic acid with the 2-position of the target substituent. For example, when bromoethane is reacted with diethyl malonate, the substituted diethyl malonate derivative is first obtained, and then after subsequent hydrolysis and decarboxylation, ethyl can be introduced based on the 2-position.
Second, it is initiated by the electrophilic substitution reaction of aromatic hydrocarbons. With benzoic acid as the raw material, under suitable conditions, if the appropriate catalyst and reaction temperature are selected, the benzoic acid benzene ring can be halogenated, and the halogen atom is introduced at the 4-position to obtain 4-halogenated benzoic acid. Then, under specific conditions, the 4-halogenated benzoic acid reacts with a suitable nucleophile and introduces the substituent at the 2-position. If 4-chlorobenzoic acid reacts with halogenated hydrocarbons in the presence of an appropriate base, a hydrocarbon group can be introduced at the 2-position.
Third, the diazotization reaction is used as the path. First, aniline compounds containing suitable substituents are prepared into diazonium salts, and then the diazoic salts are reacted with reagents such as cuprous halide to undergo a Sandmeyer reaction, which can introduce halogen atoms at specific positions in the benzene ring. The resulting product is further modified to introduce the desired group at the 2-position. For example, first prepare 2-amino-4-nitrobenzoic acid, introduce halogen atoms through diazotization and Sandmeyer reaction, then reduce nitro to amino group, remove amino group through diazotization, hydrolysis and other steps, introduce other substituents at 2-position, and finally synthesize 4-halobenzoic acid with 2-position substitutions.

Fudinitrotetrasulfonylaniline is known as picric acid in the world. When using it, many matters need to be paid attention to.
Picric acid is strongly acidic and can react with a variety of metals to form picrate salts. Such picrate salts have poor stability and can easily cause explosions when heated, vibrated or hit. Therefore, when using picric acid, never let it come into contact with metals, such as iron, copper, zinc, etc., to avoid the formation of dangerous picrate.
Furthermore, picric acid is an explosive substance and its sensitivity is quite high. During operation, be sure to handle it with care, and must not carry out violent vibration, collision or friction, otherwise a little carelessness may trigger an explosion and cause a disaster. When storing, it should also be placed in a cool, dry and well-ventilated place, away from fire and heat sources, to avoid decomposition by heat and the risk of explosion.
In addition, picric acid is toxic and can cause damage to the human body. During use, protective measures should be taken, such as wearing protective gloves, masks and goggles, to prevent it from coming into contact with the skin, respiratory tract and eyes. If you come into contact accidentally, rinse with plenty of water immediately and seek medical attention in time.
At the same time, because of its strong corrosive nature, it has a corrosive effect on many materials, such as wood, fabrics, etc. When using and storing, it is necessary to choose suitable containers and materials to avoid leakage caused by corrosion of the container and cause danger.
In short, the use of picric acid requires extreme caution and strict adherence to relevant safety operating procedures. It is essential to avoid any slack in order to ensure personnel safety and smooth operation.