2,3-difluoro-4-iodo-pyridine

2% 2C3-diene-4-cyanopyridine, although this substance is not directly recorded in "Tiangong Kaiwu", it is generally known in the chemical and pharmaceutical industries of ancient times, and its uses may have the following ends.
First, in the field of pharmaceuticals, it may be a key ingredient in medicine. Ancient pharmaceuticals often seek delicate proportions to achieve the effect of removing diseases and diseases. Cyanopyridine substances or because of their unique chemical properties, can be combined with other medicines, stimulate the efficacy and reconcile the medicinal properties. Such as ancient elixir prescriptions, often based on various gold stones, plants and trees, supplemented by special ingredients, so that elixirs can play a miraculous role. 2% 2C3-diene-4-cyanopyridine can help the drug better act on the meridians and organs of the human body, balance yin, yang, qi and blood.
Second, in the dyeing industry, it may have the ability to increase color and fix color. Ancient dyeing pursues bright and long-lasting color. Some compounds with special structures can be combined with fabric fibers to enhance the dyeing effect. 2% 2C3-diene-4-cyanopyridine can change the adsorption and fixation of the fabric to the dye, making the dyed color brighter, and it is not easy to fade after years of washing, just like the ancient silk, the color is still somewhat gorgeous after thousands of years.
Third, in alchemy and other techniques, or as an auxiliary refining thing. Alchemy pays attention to heat and ingredients, and refining also requires special materials. This substance may stabilize other ingredients in high temperature or specific chemical reactions, promote the reaction, and improve the quality of the refined thing. Such as ancient sword refining, adding special medicinal stones to the furnace can make the sword body tougher and sharper, 2% 2C3-diene-4-cyanopyridine or similar auxiliary power in such refining processes.

There are various methods for the synthesis of 2% 2C3-diethyl-4-chloropyridine. The common ones are listed as follows:
First, pyridine is used as the starting material. First, pyridine is alkylated with halogenated ethane under specific conditions, and ethyl is introduced at the 2nd and 3rd positions of the pyridine ring to generate 2,3-diethylpyridine. This reaction requires careful selection of suitable bases and solvents to promote the reaction in the desired direction. After that, 2,3-diethylpyridine is reacted with chlorine-containing reagents, such as thionyl chloride and phosphorus oxychloride, at a suitable temperature and in the presence of a catalyst, to achieve the introduction of chlorine atoms at the fourth position, resulting in 2% 2C3-diethyl-4-chloropyridine. The raw materials for this route are relatively easy to obtain, but the alkylation and chlorination steps may require fine regulation of the reaction conditions to ensure the selectivity and yield of the product.
Second, suitable pyridine derivatives can be used. If there is a pyridine derivative with suitable substituents at the 2 and 3 positions and is easy to convert to ethyl, the substituent can be converted into ethyl through a series of reactions to construct a 2,3-diethylpyridine structure. Then chlorine atoms are introduced at the 4 position through chlorination. This strategy may avoid the problem of poor reactivity of some starting materials, but it requires higher precursors of pyridine derivatives, and the synthesis of precursors may be difficult.
Third, the coupling reaction strategy of metal catalysis is adopted. For example, halogenated pyridine derivatives are used as substrates, and metal catalysts such as palladium and nickel are used to couple them with ethyl halides and chlorinated reagents respectively. Ethyl is introduced first, and then chlorine atoms are introduced to achieve the synthesis of the target product. Metal catalytic coupling reactions usually have high selectivity and reactivity, but the catalyst cost is high, and the reaction system is more sensitive to impurities, so the reaction environment needs to be strictly controlled.
Each method for synthesizing 2% 2C3-diethyl-4-chloropyridine has advantages and disadvantages. In practical application, it is necessary to comprehensively consider many factors such as raw material cost, reaction conditions, product purity and yield, and select the most suitable synthesis path.

2% 2C3-diene-4-cyanopyridine is one of the organic compounds. This material has unique physical properties. It is mostly solid at room temperature and pressure, and its appearance may be white to light yellow crystalline powder, which is visible to the naked eye.
Looking at its melting point, it is within a specific temperature range. This temperature characteristic causes the material to change its phase state under a specific thermal environment. The exact value of the melting point is of great significance for its application in various chemical processes and material preparation.
Besides its solubility, 2% 2C3-diene-4-cyanopyridine exhibits different degrees of solubility in organic solvents. Common organic solvents such as ethanol and acetone may have a certain solubility, but in water, their solubility may be quite limited. This solubility characteristic determines that they have specific requirements for separation, purification, and the selection of media involved in chemical reactions.
As for the boiling point, under specific pressure conditions, it will boil and vaporize when it reaches a certain temperature limit. The level of boiling point is related to the energy conditions and equipment parameters required for separation operations such as distillation and rectification.
Its density is also an important physical property. Under established conditions, it has a corresponding density value. This value has important guiding value for accurate measurement, mixing, and prediction in specific fluid systems.
The physical properties of 2% 2C3-diene-4-cyanopyridine are related to each other, and together affect its application and research practice in many fields such as chemical industry, materials science, and drug development.

2% 2C3-diene-4-cyanopyridine should pay attention to the following things during storage and transportation:
First, because of its specific chemical activity, when storing, be sure to choose a dry, cool and well-ventilated warehouse. Humidity can easily cause it to react such as hydrolysis, which affects quality; high temperature environment may accelerate its chemical reaction rate, or even cause danger. Good ventilation can effectively avoid excessive concentration due to volatile accumulation and reduce safety hazards.
Second, this substance should be stored separately from oxidants, acids, bases, etc., and must not be mixed. The chemical properties of 2% 2C3-diene-4-cyanopyridine are active, and contact with the above substances is prone to violent chemical reactions, or serious consequences such as combustion and explosion.
Third, when transporting, the packaging must be tight and firm. Select packaging materials that meet the transportation standards for hazardous chemicals to prevent material leakage due to package damage during transportation. At the same time, the transportation vehicle needs to be equipped with corresponding emergency treatment equipment and protective equipment, such as fire extinguishers, adsorption materials, etc., to prepare for unexpected events.
Fourth, the handling process needs to be light and light, and it is strictly forbidden to drop and heavy pressure. Because it may be sensitive to mechanical effects, violent vibration or heavy pressure or chemical reactions can cause danger.
Fifth, the relevant operators must be professionally trained to be familiar with the dangerous characteristics of the substance, safe operation procedures and emergency response methods. When operating, strictly follow the operating procedures and wear appropriate protective equipment, such as protective clothing, gloves, goggles, etc., to ensure their own safety.

2% 2C3-diene-4-cyanopyridine, the price of this product in the market varies depending on quality, supply and demand.
If it is of high quality and there is a strong demand in the market, but the supply is limited, the price may increase. Conversely, if the quality is average and the market supply exceeds demand, the price may decrease.
According to the market practice, the price of 2% 2C3-diene-4-cyanopyridine with good quality may be between 100 gold and hundreds of gold per catty. If the quality is second, the price may drop to tens of gold per catty.
And its price is also disturbed by the source of production and craftsmanship. If the source of production is rare and the craftsmanship is difficult, the cost will increase and the price will rise accordingly. However, if the source of production is widely distributed and the craftsmanship is simple, the cost will drop and the price will also decrease.
The market changes again, which is instantaneous, and the price will fluctuate accordingly. Or due to sudden reasons, the supply and demand will be out of balance, and the price will change suddenly. Therefore, if you want to know the exact price, you should carefully study the market situation and consult people in the industry.