5-Fluorobenzimidazole

5 - What are the main uses of the finless porpoise and drums?
The finless porpoise and drums are used in ancient times. First, it is a warning and command tool in the army. When marching in combat, soldiers hear the sound of the finless porpoise and drums, such as hearing the order of the general. The urgency and severity of the drums are all meaningful. Urgent drums indicate that soldiers need to quickly prepare for battle, or rush forward quickly; slow drums allow soldiers to move forward steadily and maintain the formation. Its sound travels far and wide on the battlefield, enabling each battalion and team to coordinate their actions without confusion, ensuring that the army advances and retreats in an orderly manner, and uses their arms like fingers to exert their overall combat power.
Second, sacrificial ceremonies are also commonly used. The ancients believed in the gods of heaven and earth, and sacrifices were a solemn thing. The finless porpoise also beats the sound of a drum, which is powerful and heavy, and can connect to heaven and earth and reach ghosts and gods. When worshiping mountains and rivers and ancestors, beat this drum to show respect, and pray that the ancestors of the gods and spirits will protect the wind and rain, and the country and the people will be peaceful. Its sound echoes in the sacrificial place, creating a solemn and solemn atmosphere, making those who participate in the sacrifice feel awe and make the sacrificial ceremony more solemn.
Third, the celebration occasion is also indispensable. In case of major festivals, the joy of a bumper harvest, or welcoming VIPs, or congratulating a new king on the throne, etc., the finless porpoise beats drums and beats to add joy. Its sound is exciting and cheerful, which can inspire people and drive the atmosphere. When the crowd heard the drums, sang and danced, and celebrated together, it revealed the scene of a peaceful and prosperous era, making the celebration more grand and showing the prosperity of the time.

There are various ways to synthesize 5-bromo indole carbazole. Under the paradigm of Tiangong Kaiji, the following are described in the text:
First, indole and the corresponding halogen can be substituted by nucleophilic substitution. First, take an appropriate amount of indole, place it in a clean reactor, and empty the air in the kettle with inert gas to prevent its oxidation. Next, inject an organic solvent, such as dichloromethane or N, N-dimethylformamide, so that the indole is fully dissolved to form a uniform solution. Then, slowly drop in the bromine-containing halogen according to the stoichiometric ratio, and add an appropriate amount of base, such as potassium carbonate or triethylamine, to promote the reaction. The reaction process requires precise temperature control, usually maintained at room temperature to a moderate temperature rise range, during which a magnetic stirrer is used to continuously stir to fully contact the reactants. After several hours or even tens of hours of reaction, the reaction process is monitored by thin-layer chromatography. When the raw material point almost disappears, the reaction is regarded as complete. Subsequently, the product is purified by extraction, washing, drying, column chromatography and other steps.
Second, the method of catalytic coupling of transition metals can also be obtained. Select a suitable transition metal catalyst, such as palladium catalyst, accompanied by corresponding ligands, such as phosphine ligands. Indole derivatives, bromine-containing aromatics, catalysts, and ligands are co-placed in the reaction system, and a base and an appropriate amount of solvent are added. The reaction is carried out at a specific temperature, such as in a nitrogen-protected atmosphere, heated to tens of degrees Celsius. In this process, metal catalysts play a key role in promoting the coupling of carbon-bromo bonds and carbon-indole bonds. After the reaction, a series of post-processing processes, such as filtration, concentration, purification, etc., are performed to obtain pure 5-bromo indolocarbazole.
Third, the reaction path can be recycled. Preparation of precursors containing specific functional groups requires the structural characteristics of intramolecular cyclization under appropriate conditions. Under suitable reaction conditions, such as under the action of acidic or basic catalysts, or by means of heating and light, the chemical bonds in the precursor molecules can be rearranged and cyclized to generate the target product 5-bromoindole carbazole. Subsequent operations such as separation and purification are also required to improve the purity of the product.

"Tiangong Kaiwu" says: "Mercury, that is, mercury, is the mother of hardware. If it catches fire, it will fly, and no dust will be seen. If it encounters sulfur, it will form vermilion, and if it encounters alum, it will remain in shape." Mercury and borax are heated together, and borax will melt into a glassy substance, wrapping mercury beads, making them less volatile. This is the interaction between mercury and borax.
Mercury has many unique physical and chemical properties. It is liquid at room temperature, like a flowing silver, with a bright color and good fluidity, like a smart spirit. This is its significant physical property.
Chemically, mercury is active and can react with a variety of substances. In case of sulfur, the two quickly combine to form mercury sulfide, which is cinnabar, with a vermilion color. It was often used as a pigment and alchemy raw material in ancient times. When heated with oxygen, mercury will slowly oxidize to form mercury oxide. And mercury can dissolve many metals and form amalgam, which is widely used in metallurgy and other fields.
Although mercury has wonderful properties, it is toxic. If it is accidentally sprinkled, mercury will form small mercury droplets, which roll around and are difficult to collect completely. After evaporation, it will pollute the air and damage the nervous system, kidneys and other organs when inhaled. Therefore, when using mercury, it is necessary to be careful and follow strict safety operating practices.

In today's city, the specifications of five cities, such as fruits and vegetables, poultry, and poultry, are all different according to the conditions of supply and demand. Just take the rivers and rivers, and the rivers are mostly in cold places. Their nature prefers cold water, the ease of fishing, and the different seasons are all due to the influence of the grid. If the harvest is on time, and the demand of the city has not yet been reduced, it may be flat or even slightly reduced; if there is a lack of demand, and those who seek it will definitely rise.
As for the ancient times, the treasures of the rivers are mostly in the rivers and other waters. However, today, due to the water quality and the degree of fishing, the amount of water is not as good as before. In the past, in the cities near the land, the new ones were listed on the market, and the homes of the rich were seeking each other, and the price was high. And the land of the land, due to the lack of money and the difficulty of protection, the cost is even more serious. Today, due to the scarcity of the source of land, there are many colonizers, and the size of the colonization is different from that of the wild. There is a gap, and due to the size and cost of colonization, the city also varies in different regions and seasons.
Generally speaking, the river is not in the city, and if the river is wild, it may be high in colonization, and the cost per catty can vary from 10 to 100. Wildlife has become rare and high, and uncommon people can easily obtain it; colonization, its cost per catty or from ten to ten, varies according to the supply and demand of products and markets.

Those who use waterfowl in combination with guns are a powerful weapon for dabbling in waterfowl. Use it with caution, and it involves many safety matters.
First, when handling this weapon, people must be familiar with its nature. The structure of the gun, the reason for firing it, and the method of loading it must be known in detail. If you are ignorant and ignorant, you will use it rashly, and the disaster will be easy. If you don't know the secret of firing, you will accidentally trigger the trigger, injure the innocent, and regret it too late.
Second, where you are located, you must obey the law. National laws, where firearms are strictly controlled, waterfowl and guns are also included. Hunting waterfowl should be done where the law allows, according to the law. If you cross the thunder pond and hunt in a forbidden place, not only will the waterfowl be robbed, but you will also be imprisoned.
Third, when using a gun, look around the environment. Look around, whether there are others or vulnerable things. In the waterfront, there may be fishermen or tourists. If you don't pay attention, the projectile will be mistaken, and people's lives will be at stake. And if there are houses and livestock houses around, you should also be cautious to avoid accidents.
Fourth, the habits of waterfowl also need to be understood. Know where they live, when they forage, and the rules of migration. Not only can it increase the effect of hunting, but it can also avoid excessive disturbance and ecological imbalance. And when you go according to the season, stop acting rashly during the period of hunting ban.
Fifth, the maintenance of the gun should not be ignored. Wipe it often to check whether the parts are damaged. If the gun chamber is scaled, it will affect the firing; the parts are loose and prone to failure. Proper maintenance can ensure the safety of the gun.