1-bromodibenzo[b,d]thiophene

Mercury is a highly toxic substance, and diethylene glycol is also toxic to a certain extent. Mixing the two is really harmful. However, due to the limitations of cognition involved in "Tiangong Kaiwu", the ancients rarely matched mercury and diethylene glycol in this way. If the use is strongly discussed, it may be seen in some ancient alchemists seeking alchemy.
Ancient alchemists, who wanted the elixir of immortality, often used various kinds of gold and stone poisons as materials. Mercury, in their eyes, has magical properties, or thinks that it can make people immortal like gold and stone. And diethylene glycol, or because of some of its properties, was mistaken for an auxiliary alchemy. In their alchemy methods, the two are combined in the range of [b, d], or they want to cause a unique chemical reaction in the hope of refining extraordinary elixirs.
However, from today's scientific perspective, such mixing is extremely harmful. Mercury volatilization can cause mercury poisoning, which can damage human nerves, digestion and other systems; diethylene glycol can also harm human health, and the mixing of the two is even more toxic. Although the ancients refined alchemy out of a desire for longevity, they did this dangerous move due to lack of scientific knowledge. Although "Tiangong Kaiwu" is a great scientific and technological work, it contains many process technologies in detail, but the chemical understanding is not as good as today. Such mixing is actually a wrong attempt and is not enough to follow.

Mercury is a highly toxic substance. Its mercury dichloride, or mercuric, is in the range [b, d] and has many unique physical properties.
The appearance of mercuric is often in the shape of white crystalline powder, which is heavy and delicate, with a unique luster. It flickers slightly under the light, as if it hides a mysterious light. Its smell is weak, and it is difficult for ordinary people to detect if they do not get close and smell it.
When it comes to solubility, mercuric is soluble in water, but the dissolution rate is not rapid. It needs a certain amount of time and moderate stirring to disperse evenly in water and form a transparent solution. It also has a certain solubility in organic solvents such as ethanol and ether, showing affinity for different solvents.
The melting point of mercury rise is quite clear, about 276 ° C. When heated to this temperature, the solid mercury rise slowly melts into a liquid state, just like ice and snow melting in the warm sun. The boiling point is about 302 ° C. If the temperature continues to rise to this point, the liquid mercury rise turns into a gaseous state and rises.
Furthermore, the density of mercury rise is greater than that of water. If placed in water, it immediately sinks to the bottom, just like a heavy object entering water, and it will sink decisively.
Because of its highly toxic properties, mercury rise is extremely harmful to organisms in the environment of [b, d]. Even if it is exposed to a small amount, it may cause physiological disorders of organisms and endanger life. Although the ancients had limited knowledge, they gradually realized the harm in practice. They were in awe and caution towards things containing mercury, and did not dare to touch or use them easily.

To combine 1-bromo-dibenzo [b, d] furan, there are various methods. Common ones can be obtained by a multi-step reaction of o-halogenated phenols and suitable halogenated aromatics, catalyzed by palladium, by an Ullmann reaction or similar coupling method. The Ullmann reactor, catalyzed by a copper salt or a palladium salt, promotes the aromatization of halogenated aromatics and phenols in an alkaline environment to obtain the target product.
Or it can be obtained by a specific aromatic hydrocarbon derivative through a multi-step reaction, such as the introduction of a suitable substituent first, and then a cyclization reaction. For example, using biphenyl compounds containing corresponding substituents as starting materials, the furan ring is constructed through electrophilic substitution, ring-off and other steps, and finally 1-bromodibenzo [b, d] furan.
Furthermore, it can be obtained from dibenzofuran by bromination reaction. Select suitable brominating reagents, such as liquid bromine, N-bromosuccinimide (NBS), etc. Under suitable reaction conditions, such as controlling temperature, solvent and catalyst, bromine atoms are selectively introduced into the first position of dibenzofuran.
If NBS is used as brominating agent, carbon tetrachloride is often used as solvent, azobisisobutyronitrile (AIBN) is used as initiator, and the reaction is initiated under heating or lighting conditions to promote the precise addition of bromine atoms to the target position, and then 1-bromodibenzo [b, d] furan is synthesized. All methods have advantages and disadvantages, and it is necessary to make a careful choice according to the availability of raw materials, the difficulty of controlling reaction conditions, the requirements of yield and purity.

In the city of colored glass, between [b, d], the price system is quite important to the world. Glazed glass is a strange thing, its quality is radiant, and its color is like a glow, so its price is not a general theory.
In the city, the price of colored glass is often tied to many reasons. The first is the fine and coarse texture. If its quality is pure, flawless, and clear like ice, the price of such high-quality colored glass will be high. And if there are slight impurities, and the texture is slightly inferior, the price will be slightly reduced.
The second is related to the clumsy craftsmanship. The craftsman used his magic skills to carve exotic flowers and plants and auspicious beasts on the glass. The more refined the craftsmanship, the higher the price. If it is only an ordinary shape and the craftsmanship is simple, the price will not be too high.
Furthermore, the color of glaze is also the main reason for pricing. Such as the rare colors of azure blue like the sea, bright red like fire, and emerald green, the price is often higher than that of plain glaze.
In addition, the supply and demand of the market also determines the price. If everyone likes glaze, there are many people who want it, and [b, d] is limited, the price will rise; on the contrary, if the supply exceeds the demand, the price may drop. < Br >
is that the market price of glazed glass between [b, d] varies due to factors such as texture, craftsmanship, color, supply and demand. To know its exact price, we should carefully review all situations and cannot generalize.

Mercury is toxic, and its contents are also toxic. If it is stored in the warehouse, it should be stored in a dense manner. Do not keep it outside, so as to prevent the poison from escaping, and it will affect humans and animals. The container should be fixed and tight, so as to avoid high shock, so as to prevent it from breaking and causing mercury to flow out.
Send it away, it is a proper way to prevent it from being damaged. If it is used to prevent bumps and collisions on the way, the company and the operator will be informed of its danger and take proper precautions. In case of leakage, it will be covered with sulfur quickly, so that mercury will be reduced to mercury sulfide, which will reduce its toxicity.
Furthermore, it is convenient to store the mercury well, but it should not be directly blown into the mercury. Due to the exposure and exposure of mercury, it may accelerate the loss of mercury. And do not keep food, water and other objects around to prevent them from being poisoned. Those who keep the treasure are also well aware of it. Regularly check the container for damage and leakage, and the amount of mercury in the treasure. When the delivery process is completed, follow the regulations and do not ignore it. In this way, the safety of the treasure can be preserved and the damage can be avoided.