DIBENZOTHIOPHENE,6-BROMO-2-IODO-

What are the chemical properties of this product 6-dip-2-chitosan-octanothiophene? There is no direct record of this substance in Tiangong Kaiwu, but it can be deduced according to similar objects and the ancient people's understanding of chemical properties.
Organic compounds such as chitosan-octanothiophene, their properties may be related to structure and composition. In ancient times, it is often seen that their appearance, properties and reactions. In terms of appearance, if chitosan-octanothiophene is crystalline, or has a regular shape, its luster may vary depending on the crystal type, and it can be shiny. If it is powdery, it may appear delicate.
In terms of solubility, although the ancients did not say that there was a precise solvent system, they tried it with common liquids, and water was commonly used. Chrodiocentothiophene, if it has a certain hydrophobicity, or is insoluble in water, floats on water or disperses into oil droplets. If you try it with wine (containing ethanol), because ethanol has a certain polarity and solubility, chrodiocentothiophene may be partially dissolved, depending on the number of polar groups in its structure.
In terms of thermal stability, according to the ancient heating method, if it is carefully heated on fire, it may gradually soften and melt. If the structure is unstable, it may decompose to produce odorous gases, or there may be color changes. Its decomposition temperature may vary depending on the strength of chemical bonds in the structure.
Redox property, the ancients or with simple oxidants such as oxygen in the air, exposed for a long time, if the sign dioctyl-thiophene is reductive, or reacts slowly with oxygen, the appearance color may become darker, and the properties may also change. In case of strong oxidants, such as the strong oxidizing substances prepared by the ancients with saltpeter, the reaction may be more violent, or there may be combustion, explosion, etc., depending on the specific structure of the sign dioctyl-thiophene.
Although the "Tiangong Kaiwu" does not contain the sign dioctyl-thiophene in detail, according to the method of ancient observation, its chemical properties can be slightly deduced from the aspects of appearance, solubility, thermal stability and redox.

In "Tiangong Kaiwu", the main uses of beryllium and bismuth are quite complicated.
Beryllium is light and tough. In ancient times, it was often a good choice for weapon making. With its toughness, weapons such as swords and halberds have sharp edges and are durable. In war, it can defeat the enemy and defend the country. And beryllium is also used in exquisite craftsmanship, such as making exquisite mechanical parts. With its unique properties, it makes the operation of instruments more flexible and accurate.
As for bismuth, it is unique. In the world of alchemy, bismuth is important for alchemists because of its special chemical properties. Alchemists hope to use the characteristics of bismuth to refine miraculous pills in order to seek a recipe for immortality. Although this goal has never been achieved, the wonderful changes of bismuth in the process of alchemy are also the germ of chemical exploration. And bismuth also plays an important role in the manufacture of some special alloys. Fusion with other things can change the properties of the alloy to create special alloys suitable for different purposes, or for casting exquisite utensils, or for some fields with special requirements for material properties, such as the manufacture of refractory utensils.

There are many synthetic methods of 6-bromo-2-naphthol formaldehyde. The following are the common ones:
1. ** Using 2-naphthol as the starting material **:
- Let 2-naphthol react with bromine first to obtain 6-bromo-2-naphthol. This process requires careful control of reaction conditions, such as temperature, amount of bromine, etc., to ensure that the main target product 6-bromo-2-naphthol is generated.
- Subsequently, 6-bromo-2-naphthol is formylated. Vilsmeier-Haack reagent, which is composed of DMF (N, N-dimethylformamide) and phosphorus oxychloride (POCl), is a commonly used formylating reagent. Under appropriate temperature and reaction time, 6-bromo-2-naphthol interacts with this reagent to achieve the introduction of formyl groups, thereby generating 6-bromo-2-naphthaldehyde.
2. ** Using 2-methylnaphthalene as the starting material **:
- Bromination of 2-methylnaphthalene, by selecting suitable brominating reagents and reaction conditions, bromine atoms can be introduced at the 6 position of the naphthalene ring to obtain 6-bromo-2-methylnaphthalene.
- Next, 6-bromo-2-methylnaphthalene is oxidized. A suitable oxidizing agent, such as active manganese dioxide under mild oxidation conditions, or a relatively strong oxidizing agent such as chromic acid, etc., oxidizes the methyl to an aldehyde group, and finally obtains 6-bromo-2-naphthalaldehyde. < Br > 3. ** Using 6-bromo-2-naphthalene acetone as raw material **:
- First convert 6-bromo-2-naphthalene acetone into the corresponding alcohol, such as reducing with sodium borohydride and other reducing agents, to generate 6-bromo-2 - (1-hydroxyethyl) naphthalene. After that, the alcohol is oxidized to aldehyde by suitable oxidation methods, such as Swern oxidation or Dess-Martin oxidation. This oxidation process requires precise control of the reaction conditions to avoid excessive oxidation, so as to synthesize 6-bromo-2-naphthalaldehyde.

In the well of the market today, the price of six baht and two baht and half taels varies from time to time, and also varies with the supply and demand of the city. In ancient times, the money law was not uniform, and all kinds of coins were parallel to the city, and their prices were also difficult to determine.
For a six baht, its weight is six baht, the shape is regular, the copper is fine, and the caster is also quite particular. In the city, if it is a peaceful year, the trade is prosperous, and the circulation of goods is frequent, the price may be slightly higher. According to the common situation at that time, if you buy a stone of corn, you need three or five six baht; if it is a piece of cloth and silk, you need two to four six baht. However, in the event of a famine, there is a shortage of rice and silk, and prices are soaring, the purchasing power of six baht and a half taels should be reduced.
As for two baht and a half taels, its weight is lighter, or because the materials at the time of casting are simple and labor-saving, so in the city, its price is often lower than six baht and a half taels. Buy ordinary things, such as a few catties of vegetables and food, or two and a half baht; if you buy slightly more expensive utensils, such as pottery dishes, you may need two or three. However, there are also merchants who use it because of its lightness, and they are also happy to use it when trading small and broken things.
Roughly speaking, the price of six baht is high, and each can be more than double However, the market is impermanent, and the price is impermanent, either due to differences in regions or changes in times. The prices of the two fluctuate up and down in the market, and cannot be generalized.

In "Tiangong Kaiwu", it is stated that "the storage of six-to-two-beans and boiling juice should be placed in the first place, and it should be used as soon as possible. The boiling juice of water and beans is easy to melt, and if exposed to the sun or in a dense place, it will be perishable. The place where it is widely used can be changed at the speed of its melting, so that it can be stored for a long time for use. However, such a good product cannot be stored for a long time, and it needs to be used quickly for other things, and it is not necessary to avoid it. Therefore, the storage of six-to-two-bean boiling juice must be widely used, and it must be used as soon as possible."