1 Difluoromethoxy 2 Iodobenzene

Arsenic, or arsenic trioxide, is a highly toxic substance. Its main use is in the field of medicine. Ancient healers were well aware of the toxicity of arsenic, but they also made good use of its properties to cure diseases. For some chronic diseases, such as carbuncle and tuberculosis, an appropriate amount of arsenic can be used as medicine, or it can be used to attack poison with poison. With its fierce power, the disease can be dispelled and the disease can be alleviated. However, it needs to be used with caution. If the dosage is slightly poorly controlled, it will endanger life.
This time it is used in agriculture. Arsenic has a significant toxic effect on many pests. In the past, farmers used to spread arsenic-containing agents in the fields to control pests and ensure a good harvest of crops. However, this usage is prone to soil pollution, and residual arsenic may endanger humans and animals, so the pros and cons must be weighed when applying.
Furthermore, arsenic was also used in ancient metallurgy. In the process of metal smelting, an appropriate amount of arsenic can help remove impurities and improve the purity and quality of the metal. For example, when smelting copper, arsenic may react with impurities to achieve the purpose of purification.
However, arsenic is extremely toxic, no matter what kind of use, it needs to be handled with caution. A little carelessness will cause harm to life. Although the ancients used arsenic, they were always vigilant of its hazards and tried to use it properly to avoid its disasters.

The synthesis of dichloroacetyl groups has been carried out through the ages. The first method is to co-heat dichloroacetic acid with sulfinyl chloride to obtain dichloroacetyl chloride, and then react with alcohols to obtain the corresponding ester, and then through hydrolysis, aminolysis, etc. to obtain dichloroacetyl derivatives. Among them, the reaction of dichloroacetic acid and sulfinyl chloride requires a suitable temperature, usually heated to about 70-80 degrees Celsius, and the reaction is slow. Sulfur dioxide and hydrogen chloride gas escape to obtain pure dichloroacetyl chloride.
The second method starts with chloroacetic acid, first chlorinated to obtain dichloroacetic acid, and then converts to dichloroacetyl according to the above method. When chlorination, chlorine is often used as a chlorinating agent. In the presence of catalysts such as phosphorus trichloride or azobisisobutyronitrile, the temperature is controlled at about 50-60 degrees Celsius, and chlorine is gradually introduced to fully chlorinate chloroacetic acid.
As for the synthesis of benzonitrile, there are also many ways. First, benzene is co-reacted with ammonia and oxygen. In the presence of catalysts such as vanadium-titanium oxide, benzonitrile can be obtained at a gas phase reaction at a high temperature of about 400-500 degrees Celsius. In this reaction, the ratio of toluene, ammonia and oxygen needs to be precisely adjusted, and the catalyst activity has a great influence on the reaction.
Second, benzyl chloride and sodium cyanide react in a solvent such as dimethylformamide to obtain benzyl nitrile. This liquid-phase reaction, the temperature should be controlled at 60-70 degrees Celsius, the reaction is stable, but you need to pay attention to the toxicity of sodium cyanide, and the operation must be cautious.
Third, benzaldehyde and hydroxylamine react to benzaldehyde oxime, and then dehydrate and convert to benzyl nitrile through the action of a dehydrating agent such as phosphorus pentoxide. In this process, the preparation of benzaldehyde oxime needs to control the reaction conditions so that the reaction is sufficient. The dehydration step also needs to choose the appropriate dehydrating agent and reaction temperature, about 100-120 degrees Celsius, to ensure the high yield of

Diacetyl, which does not have this name, is feared or rarely used, so its properties can be described.
As for saltpeter, its properties are good. Saltpeter, the name of the chemical is nitric acid. Its color is white, often crystalline, and the earth is brittle, which makes it feel good.
As far as its physical properties are concerned, saltpeter is easily soluble in water, soluble in water, and absorbs light, so the degree of solution can be reduced. Its melting temperature is high, and it needs to be added to a high degree of melting.
And chemical properties, saltpeter and oxidation. In case of combustible things, it can support combustion, and the reaction is strong. In ancient times, saltpeter was very important for the manufacture of fire. For fire, make saltpeter, sulfur, and charcoal in a certain proportion. Saltpeter, in this case, provides oxygen, making sulfur and charcoal burn vigorously, releasing huge energy, and has the same effect as frying and pushing.
In addition, saltpeter is also used in fields such as heat, metallurgy, etc. In heat, it may have the effect of clearing fire; in metallurgy, it can be used to improve some metals. Moreover, because of its characteristics, saltpeter has important uses in many aspects, and has a deep influence on the life, life and affairs of the ancient people.

Diethylaminoethanol, which is a colorless to light yellow transparent liquid with an ammonia odor, can be miscible with water, alcohols, ethers, esters, benzene, carbon tetrachloride, etc. Its chemical properties are active, and it is an alkaline organic compound. It can neutralize and react with acids to form salts. For example, it can react with hydrochloric acid to form corresponding hydrochloride salts.
Saltpeter, the main chemical composition is potassium nitrate. Its unique chemical properties make it easy to decompose when heated to form oxygen and other products. This characteristic makes it commonly used in gunpowder preparation in ancient times. It is a strong oxidant and can react violently with many reducing substances under specific conditions. It has good solubility in water and its aqueous solution is neutral. In ancient times, saltpeter was often used for alchemy, medicine, and making ice magazines. During alchemy, its oxidizing properties are used to participate in many chemical reactions; in medicine, it can play a certain pharmacological role; when making ice cues, its dissolution endothermic principle is used to achieve cooling.

I look at your question, but I am inquiring about the price range of diethylaminoethanol in the market. However, the price changes in the market, and the price is changeable. If you want to confirm its price, you should carefully observe the current situation and consider various factors.
The price of this substance varies depending on the quality, quantity, distance of source, and urgency. If the quality is good and pure, the price will be slightly higher; if the quantity is huge, there may be a discount. And in different places and at different times, the price is not the same.
In commercial shops, the price may be between tens and hundreds of dollars per liter if the quality is ordinary and the quantity is moderate. If it is high purity, the price should be doubled when used in the field of fine research. And if the quantity needs to be extremely large, negotiate with the merchant to buy, the price may be negotiable, and the reduction in the number is unknown.
If you want to get a definite price, do not consult various pharmaceutical companies, chemical companies, or explore their prices on the platform of the market, and compare several companies, you can get a more accurate price, in order to meet the needs, to avoid price fraud. And the market conditions are ever-changing, and you can keep track of the new times before you can hold the price. It is advisable to buy.