2-thiophenecarbonyl chloride, 3-bromo-

2-%E5%99%BB%E5%90%A9%E7%94%B2%E9%85%B0%E6%B0%AF%EF%BC%8C3-%E6%BA%B4-%E7%9A%84%E7%94%A8%E9%80%94%E6%98%AF%E4%BB%80%E4%B9%88%3F
2 - Arsenic, that is, arsenic trioxide, is extremely toxic. Ordinary people can endanger their lives by eating or inhaling a small amount. It is a highly toxic thing that kills goods and murders other people's lives. It is mostly used for evil. However, in the medical system, after being processed and strictly controlled in doses, it can also be used to fight poison with poison. It may have a miraculous effect on some difficult diseases such as specific blood cancers.
3 - Mercury, that is, mercury, is a liquid metal. Its use is quite extensive. In the practice of alchemy, many alchemists believe that mercury and lead can be refined into elixirs, and they can prolong life and become immortals. Although it is mostly false, it has long been famous in the field of ancient alchemy. In the court, in order to protect the corpse from decay, mercury was often poured into the corpse to ensure that the corpse would not melt for a long time. In medical practice, mercury and its compounds can be used as medicine, and external use can treat scabies, sores and other diseases. However, due to its toxicity, the dosage should be extremely cautious. In industry, mercury is often used in thermometers, barometers, etc. because of its special physical properties. With its characteristics of thermal expansion and contraction, it can accurately measure changes in temperature and air pressure.

2-%E5%99%BB%E5%90%A9%E7%94%B2%E9%85%B0%E6%B0%AF%EF%BC%8C3-%E6%BA%B4-%E7%9A%84%E7%89%A9%E7%90%86%E6%80%A7%E8%B4%A8%E6%9C%89%E5%93%AA%E4%BA%9B%EF%BC%9F
2-chloro-propane-1-ol, that is, 3-chloro-1-propanol, this material has many physical properties. It is a colorless and transparent liquid at room temperature and pressure, and it looks clear and has no special color.
Smell, 3-chloro-1-propanol has a weak irritating smell, but its irritation is not strongly pungent and is still tolerable.
When it comes to volatility, it has a certain degree of volatility. In an open environment, it will slowly evaporate into the air. < Br >
Its boiling point is about 160-165 ° C. At this temperature, 3-chloro-1-propanol will change from liquid to gaseous. The melting point is about -28 ° C. When the ambient temperature drops to this point and below, it will solidify into a solid state.
3-chloro-1-propanol and water can show a certain solubility, which can partially dissolve in water, and can miscible with many organic solvents, such as ethanol, ether, etc., in any ratio, reflecting good miscibility.
In terms of density, its density is slightly higher than that of water, about 1.13 g/cm ³. After mixing with water, it will sink to the bottom.
In addition, 3-chloro-1-propanol also has a certain refractive index, which is its optical property. Under certain conditions, light will be refracted when passing through the substance, and its refractive index is of great significance for the identification and analysis of the substance. These physical properties are interrelated and together constitute the characteristics that distinguish 3-chloro-1-propanol from other substances. It plays a key role in guiding its application and research in the fields of chemical industry, medicine and so on.

2-%E5%99%BB%E5%90%A9%E7%94%B2%E9%85%B0%E6%B0%AF%E4%B8%8E3-%E6%BA%B4-%E7%9A%84%E5%8C%96%E5%AD%A6%E6%80%A7%E8%B4%A8%E5%A6%82%E4%B8%8B%E6%89%80%E8%BF%B0:
2-%E5%99%BB%E5%90%A9%E7%94%B2%E9%85%B0%E6%B0%AF, also known as dichlorodifluoromethane, its properties are very special. This is the color, odor, and chemical properties are determined, and most of the chemical and biological reactions are often found. Its boiling temperature is low, -29.8 ° C, so it is easy to change. This characteristic makes it widely used in refrigeration systems in the past, such as refrigerators and air conditioners, as a refrigerant. However, its ozone has a breaking effect, because it contains chlorine atoms. Under ultraviolet radiation, chlorine atoms react to ozone, resulting in thin ozone, so it has been gradually restricted in use.
3-%E6%BA%B4-%E7%9A%84%E5%8C%96%E5%AD%A6%E6%80%A7%E8%B4%A8, this may refer to 1,1,1-trichloroethane. Its color solution has a chloroform-like smell. With good solubility properties, it can dissolve a wide range of substances, so it is often used as a solution for cleaning the surface of gold, removing oil stains, etc. Its chemical properties are not determined, but in high temperatures or in case of open flames, or decomposition, toxic substances, such as chlorination, etc. In addition, its chemical properties can be quickly reduced to the air under normal conditions. It also has a certain shadow in the environment. After being inserted into the atmosphere, it will cause photochemical reactions, and the amount of air will cause adverse effects.
Both of these have certain uses in work and life in the past. However, due to the shadow of the environment, they are now subject to many restrictions in use. People are committed to finding more secure alternatives.

To prepare ethyl 2-pentynylacetate and 3-bromo-acetate, the following steps can be followed.
To discuss the preparation of ethyl 2-pentynylacetate. Using acetylene as the starting material and reacting it with sodium metal in liquid ammonia, sodium acetylene can be obtained. This reaction takes advantage of the low temperature environment of liquid ammonia to prompt the active hydrogen of acetylene to leave, forming acetylene negative ions, which are then combined with sodium ions to form sodium acetylene. Then, sodium acetylene is reacted with bromoethane, which is a nucleophilic substitution reaction. Acetynyl negative ions act as nucleophiles to attack the α-carbon of bromoethane, and bromine ions leave to form 1-butyne. Then, 1-butyne reacts with sodium metal in liquid ammonia again to form sodium butyne. Sodium butyne reacts with ethyl bromoacetate for nucleophilic substitution, and the butyne group replaces the bromine atom to obtain ethyl 2-pentynyl acetate.
As for the synthesis of 3-brom- (the information here seems to be incomplete, and it is assumed that the follow-up is a certain hydrocarbon), if propylene is used as the starting material, under light or high temperature conditions, propylene undergoes a radical addition reaction with hydrogen bromide. Due to the characteristics of free radical reaction, bromine atoms will be added to the terminal carbon of propylene to form 1-bromopropane. In order to obtain 3-bromo-a compound containing double bonds, 1-bromopropane can be eliminated with a strong base (such as ethanol solution of sodium ethyl alcohol) to form propylene. Subsequently, propylene undergoes allyl bromination reaction under N-bromosuccinimide (NBS) and light conditions, and bromine atoms can be introduced at the α-position of the double bond to obtain 3-bromo-a-allyl bromide.
In this way, through the above series of reaction steps, the synthesis of 2-pentyne acetate ethyl ester and 3-bromo- (putative compound) can be achieved respectively. The synthesis process requires attention to the precise control of reaction conditions, such as temperature, reagent ratio, etc., to ensure the high efficiency and selectivity of the reaction.

What I am asking today is about the market prices of dioctyl formamide and trichloroethylene. However, it is not easy to know the prices of the two in detail, because their prices often change due to many factors.
First of all, the price of dioctyl formamide is affected by various factors such as raw material supply, market demand, and production process. If the origin and output of raw materials change, or if there is a shortage of supply due to natural and man-made disasters, the price will rise; on the contrary, if the supply is abundant, the price will fall. And if the market demand for it increases sharply, if the related industries are booming and the demand for dioctyl formamide is strong, merchants may raise prices to make profits; if the demand is low, the price will also be reduced. And the cost of different production processes is different, and the higher the cost, the price is also different. According to past market conditions, its price fluctuates within a certain range, but the exact number depends on the actual situation of the current market.
As for trichloroethylene, the same is true. Its price is affected by the overall situation of the chemical industry, environmental protection policies, import and export conditions, etc. The chemical industry is prosperous, and the demand for trichloroethylene increases, and the price often rises; if environmental protection policies become stricter, some non-compliant production enterprises stop production, supply decreases, and prices also rise. In terms of import and export, if the import volume increases, the market supply is abundant, and the price may be suppressed; if the export volume increases and the domestic supply tightens, the price may rise.
To know the exact price of these two in the current market, it is advisable to consult the merchants in the chemical product trading market, industry information platforms, or communicate directly with relevant manufacturers and distributors to obtain accurate price information.