2,6-difluoro-3-iodopyridine

2% 2C6-diethyl-3-furanaldehyde, although its name is not directly stated in "Tiangong Kaiwu", it is deduced from the ancient chemical way, or there are traces of its related uses.
In ancient times, many chemical raw materials and products were mostly used by people's livelihood. 2% 2C6-diethyl-3-furanaldehyde and other substances may be used in the preparation of fragrances. Ancient fragrances are not only used to increase fragrance, but also used in smoked clothes, sacrifices, medical treatment and many other occasions. If this aldehyde substance has a unique aroma, it can be prepared and added to the fragrance to increase the richness of its fragrance.
Furthermore, in the ancient dyeing process, it may also be involved in its use. In ancient dyeing, natural plants and minerals were often used as sources, but various additives were also explored to help color and fix color. If 2% 2C6-diethyl-3-furanal can react with dyes in a specific way, it may optimize the dyeing effect and make the color of fabrics more vivid and lasting.
Thinking about the field of ancient medicine, although the cognition at that time was different from today, the exploration of the characteristics of various substances has not stopped. If this aldehyde substance has certain pharmacological activity, it can be processed into medicine and used to relieve certain diseases. However, the ancients used medicine after long-term practice and exploration. If it is a rare substance, the possibility of being used as medicine may be low.
Although the "Tiangong Kaiwu" does not explicitly state the use of 2% 2C6-diethyl-3-furanaldehyde, it plays its unique role in ancient chemical industry, people's livelihood, or in the fields of fragrances, dyeing, medicine and other fields in an indirect or potential way.

Although the synthesis method of 2% 2C6-diene-3-alkynyl compounds is not explicitly mentioned in Tiangong Kaiwu, it can be speculated from the following aspects according to the traditional organic synthetic chemistry concept and the development of ancient chemical technology.
First, raw material selection and processing. In ancient times, natural substances were often used as starting materials. For such compounds, natural oils and plant extracts containing alkynyl structures may be selected. For example, some vegetable oils contain unsaturated carbon-carbon double bonds, and alkynyl groups can be introduced through specific methods. Like in ancient oil processing, heating, alkali treatment, etc. are known to change the structure of oils and fats. First, the oil containing alkenyl groups is moderately hydrolyzed to obtain alkenyl fatty acids, and then halogenated reagents, such as halides that may have been homemade in ancient times, are used to halogenate alkenyl groups to create conditions for the introduction of alkynyl groups.
Second, the reaction process. Although there were no modern advanced instruments in ancient times, many techniques for controlling chemical reaction conditions were mastered. When introducing alkynyl groups, a similar nucleophilic substitution reaction principle may be used. Homemade alkynides are used as nucleophilic reagents to react with halogenated alkenyl compounds. In the reaction conditions, natural heat sources, such as charcoal fire, are used to control the temperature. Based on experience, explore the appropriate reaction time, and judge the reaction process by observing the color and state changes of the reaction system. For example, the reaction system is gradually clarified after becoming cloudy from clarification,
Third, separation and purification. In ancient times, there was a lack of accurate separation methods such as modern chromatography, and simple physical methods were mostly relied on. Separation by using differences in solubility and boiling point between compounds and impurities. If the solubility of the product and impurities in water is different, it can be preliminarily separated by water extraction, and then distillation and other methods are used to separate the product from other impurities by different boiling points. Using a special ceramic distillation apparatus, the distillation temperature is controlled according to the heat, so that the product is separated in the form of steam, and collected after cooling to obtain a relatively pure 2% 2C6-diene-3-alkynyl compound.

2% 2C6-diethyl-3-nitropyridine is an organic compound. Its physical properties are as follows:
In terms of appearance, it is mostly a crystalline solid at room temperature. The color may be white to light yellow, and the texture is delicate. This color and morphology are related to the atomic arrangement and electron cloud distribution in its molecular structure. The specific structure makes light selectively absorbed and scattered, so this appearance characteristic is displayed.
At the melting point, it has been experimentally determined that its melting point is about [X] ° C. Intermolecular forces such as van der Waals forces and hydrogen bonds need to be overcome when heated. When the melting point is reached, the lattice can be cancelled by thermal energy, the lattice structure disintegrates, and the substance changes from solid to liquid state. < Br > In terms of boiling point, it is about [X] ° C. When the liquid vapor pressure is equal to the external atmospheric pressure, the temperature is the boiling point. The intermolecular force of this compound determines its boiling point, and the relatively strong force makes the boiling point higher.
In terms of solubility, it is slightly soluble in water. Because its molecules are organic structures, the polarity is weak, while the polarity of water is strong. According to the principle of "similar miscibility", the miscibility of the two is poor; but it is easily soluble in organic solvents such as ethanol and ether. The polarity of the organic solvent is similar to that of the compound, and the intermolecular force is conducive to mixing with each other. The density of
is about [X] g/cm ³. The density reflects the mass of the substance per unit volume. It depends on the molecular weight and the degree of molecular accumulation. The molecular weight and spatial arrangement of this compound determine its density value.
Odor, has a special organic odor. This odor is caused by the volatilization of its molecules into the air and the interaction with olfactory receptors, resulting in specific molecular structures producing specific odor characteristics.

2% 2C6-diethyl-3-naphthol is in the market, and its price is impermanent, due to various reasons.
The price in the city often depends on the state of supply and demand. If there are many people seeking this product, but there are few suppliers, the price will be high; on the contrary, if the supply exceeds the demand, the price will be low. And the difficulty of its preparation is also related to the price. If the production requires a lot of effort, and the materials used are also difficult to obtain and the price is high, the price in the market will not be low.
Furthermore, the competition in the market is also an important reason. If there are many people in the industry who sell this product, it is a competition for customers, or there are those who reduce the price to collect it; if only one company sells it, or has special ability, and others cannot reach it, the price may be higher. In addition, the change of times also makes the price move. If the world's decrees and tax changes can cause the price to rise and fall.
In the past, there were rare medicines, which were difficult to prepare, and the materials used were also thin. At the market price, ordinary people could not match. Later, due to the progress of surgery, the preparation is easy, the supply is increased, and the price is reduced. The price of 2% 2C6-diethyl-3-naphthol is also similar, or varies with changes in world conditions, techniques, and supply and demand. If you want to know the exact price, you need to consult the merchants in the various cities, or look at the records of the current prices, so that you can obtain a more accurate number.

The storage conditions of 2% 2C6-diethylene-3-heptyne are related to the suitable conditions for the storage of this alkyne substance. According to the theory of "Tiangong Kaiwu", the storage of the substance often depends on its properties.
This 2% 2C6-diethylene-3-heptyne has the general properties of alkyne compounds, its chemical properties are active, and it is easy to react with various substances. Therefore, when storing, the first thing is to isolate the air. There is oxygen in the cover air. When this alkyne encounters oxygen, it may change due to oxidation and damage its quality. When storing in a sealed container, and the material of the container must also be carefully selected. It is advisable to use materials that do not react with it, such as glass, specific metal alloys, etc.
Furthermore, temperature is also important. This alkyne is heated, or the reaction is accelerated, and even dangerous. Therefore, it should be stored in a cool place away from direct sunlight. The heat and radiation of sunlight can promote its chemical changes. Generally speaking, the temperature should be maintained at 5 ° C to 25 ° C. If the temperature is too high, the molecular movement will intensify and the reactivity will increase greatly; if the temperature is too low, although the reaction will slow down, there may be physical changes such as solidification, which will also affect its quality.
Also, humidity should not be ignored. Moisture may cause its hydrolysis, or react with impurities in it. Therefore, the storage place must be dry, and a desiccant can be placed next to it to absorb moisture.
And this substance is flammable. The storage place must be kept away from fire and heat sources, and fireworks are strictly prohibited. The surrounding electrical equipment should also be explosion-proof to prevent the generation of electric sparks from igniting this ethylene.
Store 2% 2C6-diethyl-3-heptyne in a sealed, cool, dry place without fire and heat source to ensure its quality and safety.