2-Acetyl-5-bromothiophene

The world has always sought the breadth of its contents in order to hold water and slurry, but its strength cannot be lifted by itself. If you think it is a scoop, it will have no tolerance, so everyone is light on it. However, Keiko did not realize its strange use.
If you take the hood as a big bottle, and it floats in the rivers and lakes, and is free between heaven and earth, it is not related to secular affairs, so it is also great to use it. The nature of things has no definite use, and it is well used when people observe it.
Those who raze the foundation have strange physical properties. Although ordinary people regard it, it may not be of great use, but the wise can see it in its small and extraordinary. If you place Yijian in a suitable environment, or you can give full play to its hidden power, it will have an effect that is unexpected to everyone.
The nature of things is rigid, soft, strong and brittle. The five-stone hood, although its strength is not strong enough to be heavy, its softness can be changed according to the change of things. Although the quality of Yijian is not known, it must also have a unique nature. It can withstand erosion over time, or it can be changed in response to changes in foreign places, and it is comparable to non-vulgar things.
And the use of husband's things is not only found in shape, but also in God. The five-stone hood, if used only by its shape, is nothing more than a vessel for holding water and a material for scoop. However, if you think about it with your mind, it can be used for a free boat, and you can enjoy the rivers and lakes. This is the use of the mind, not the shape of things. The same should be true of Yijian. The wonders of its materiality may inspire people's hearts and attract people to wonderful realms, not just its material uses.
Therefore, the nature and use of things are not as simple as they can be seen on the surface. The five-stone lake and Yijian both have their hidden wonders. Only when the wise see them with their discerning eyes and use them with ingenuity can they see their extraordinary places, and they are not hidden by worldly views.

Diborane ($B_2H_6 $) and hydrazine ($N_2H_4 $) are chemical substances and each has its own properties.
Diborane is a colorless gas with high reactivity. It burns in air, burns violently, produces boron oxides and water, and exerts a lot of heat, such as $B_2H_6 + 3O_2\ longrightarrow B_2O_3 + 3H_2O $. In contact with water, it reacts quickly, generating boric acid and hydrogen, that is, $B_2H_6 + 6H_2O\ longrightarrow 2H_3BO_3 + 6H_2 $. Because of its lack of electrons, it is a strong Lewis acid, which can form coordination bonds with solitary pairs of electrons, and can be used as a reducing agent for organic synthesis. In many reactions, it reduces oxygen-containing compounds and has good reaction selectivity.
Hydrazine, a colorless oily liquid with an ammonia-like odor. It is alkaline and can form salts with acids. If it reacts with hydrochloric acid, it can obtain hydrazine hydrochloride, that is, $N_2H_4 + 2HCl\ longrightarrow N_2H_6Cl_2 $. It is also highly reductive. Under appropriate conditions, metal ions can be reduced to metal elementals, such as reacting with silver ions to precipitate silver. Hydrazine has poor thermal stability and is easily decomposed when heated. It produces nitrogen, hydrogen and other gases. It is a high-energy fuel. In combination with appropriate oxidizing agents, it can be used as rocket propellant, which emits a lot of heat in the reaction and provides power.
Both are important chemical substances and are widely used in chemical, materials, energy and other fields. However, due to its high reactivity, it is necessary to pay attention to safety when using it, and properly handle and store it

"Tiangong Kaiwu" has written that the raw material of maltose is glutinous rice, followed by corn.
The first is for food.
has a unique sweet taste and can increase the taste of food. In the production of cakes, it can be used as a sweetener to make the cakes sweet and moist in texture. For example, when making sugar cakes,
can be used as a filling. After heating, it is thick and sweet. And
can prolong the shelf life of cakes. Because of its hygroscopicity, it can prevent the cakes from drying and cracking. When boiling soup, adding
can make the soup taste more mellow and richer. Traditional medicine regards

as a good medicine, which has the effect of nourishing the middle and nourishing qi, relieving pain urgently, moisturizing the lungs and relieving cough. If a person's spleen and stomach are weak, and the abdomen is anxious and painful, the
can warm the spleen and stomach, and relieve pain urgently. In case of lung deficiency cough, its moisturizing lung power can relieve cough symptoms and moisturize the lungs.
Furthermore, it is used in brewing. In the brewing process,
can be used as a saccharification agent. It contains amylase and other substances, which can convert starch in grains into sugar, provide nutrients for yeast fermentation, promote alcohol production, affect the flavor and quality of wine, and make the taste of wine more mellow and rich aroma.
In addition, in some traditional dyeing processes, it can be used as a mordant to assist in coloring, making the color adhere more firmly and evenly, and making the fabric dyeing effect better. In short, it played an important role in many fields such as diet, medicine, brewing, etc.

First, the borane reaction method. Borane and specific nitrogen-containing compounds are co-placed in a reactor under suitable reaction conditions. Boranes are highly active, and nucleophilic substitution or addition reactions can occur when encountering nitrogen-containing compounds, such as pyridine derivatives. The temperature is controlled at tens of degrees Celsius, and the pressure is slightly higher than normal pressure. After several hours of reaction, the boron atoms are connected to the nitrogen atoms to gradually build the structure of ethylboronyl groups, and the part connected to the nitrogen atoms forms the basic structure of cyanoguanidine. This process requires fine regulation of the reaction process to obtain the target product. < Br >
Second, metal catalytic synthesis method. Appropriate metal catalysts, such as palladium, nickel, etc., are selected in an organic solvent system to add boron-containing halides and nitrogen-containing heterocyclic precursors. The metal catalyst can activate the halogen atom and the nitrogen heterocyclic ring to make the two coupling reaction. During the reaction, the temperature should be moderate, or fifty or sixty degrees Celsius, and it needs to be protected by inert gas to prevent the reactants from being oxidized. The metal atoms are like bridges, connecting the key structural units of boron groups and cyanoguanidine. After several hours of reaction, the desired product can be obtained. This method relies on the activity and selectivity of the catalyst to precisely synthesize the product.
Third, the organic synthesis route method. First, boron-containing intermediates and cyanoguanidine-containing prototype compounds are prepared by common organic synthesis reactions. For example, through classic reactions such as esterification and amidation, the basic skeleton is constructed. Subsequently, the boron-containing intermediates are combined with cyanoguanidine precursors under appropriate acid-base conditions by condensation reaction. This process involves many steps, and it is necessary to strictly control the conditions of each step of the reaction, such as the proportion of reactants, reaction time, pH, etc. After multiple steps of conversion, the final synthesis of ethylboryl-cyanoguanidine is completed. However, its advantage is that the synthesis path can be flexibly adjusted to meet different needs.

Mercury is toxic in nature, and it is easy to be evaporated into mercury. This evaporation can cause many health problems, such as mental health problems, such as mental health problems, etc. Therefore, it is necessary to store it in a secret device, and it is good to avoid direct exposure to light and high temperature, so as to prevent it from being damaged. In this way, the package must be solid, capable of withstanding collisions and shocks, and it is clear that it is toxic, and the people who are damaged also need to be aware of its dangers and methods.
It is also toxic and heavy gold, and it is appropriate to isolate the tide, because it is easy to generate corrosion due to moisture. Store it in an appropriate container and place it within reach of children to prevent it from being eaten. In the container, it is also necessary to keep its packaging intact. If there is a leak, the powder or powder will be scattered, polluting the environment and harming humans and animals.
Cyanide, toxic to the extreme, and a small amount can be fatal. If it is stored, it must be used for cleaning. The room needs to be fixed, and there are secret security measures to prevent and prevent leakage. It is necessary to control the dryness, communication, temperature and temperature. It is even more necessary to be careful. It must be carried out by the enterprise of dangerous products. There are special prevention facilities, and it is equipped with escorts, emergency rescue and detoxification.
In addition, mercury, hydrogen, cyanide, and other substances need to be kept in phase during the process of storage, focusing on safety, leakage prevention, environmental protection, and health protection.