4-BROMOTHIOPHENE-2-ALDEHYDE

What is the main user of 4-alum-2-alum?
Alum is a genus of minerals with a wide variety of categories, and alum is particularly commonly used. Alum, scientific name Aluminum Potassium Sulfate Crystal Hydrate, was already important to the world in ancient times and has a wide range of uses.
First, in the matter of water purification, the effect is remarkable. Although the ancients did not know its chemical principle, after long-term practice, they knew that when it was put into water, it could make the suspended impurities in the water condense and settle, making the muddy water clear for drinking and living needs. Although "Tiangong Kaiwu" did not elaborate on the chemical mechanism of alum water purification, it has been used by the people for a long time.
Second, in the field of medicine, it is also useful. It has the functions of astringent, hemostasis, dryness and dampness. External use can treat skin diseases such as scabies and eczema, and internal use can stop diarrhea. Due to the chemical properties of alum, it can act on the physiological functions of the human body and regulate pathological states.
Third, it is also used in food processing. For example, when making fried dough sticks and other foods, alum is added to make it expand and crunchy. This is because alum reacts with other ingredients in the food to produce gas, resulting in the formation of a porous structure inside the food, resulting in a better taste.
Fourth, in the printing and dyeing industry, alum is used as a mordant. After the fabric is treated with alum, it can enhance the adhesion of the dye, making the dyeing more firm and bright. " Although Tiangong Kaiwu does not fully describe the delicacy of alum in this industry, it is widely used by printing and dyeing craftsmen to improve the quality of fabrics.
All these show the important position of alum in the life and production of the ancients. Although some uses have changed due to safety and other factors with the development of the times, its past achievements are indelible.

Lead and mercury are the second of the hardware. Lead is blue and black in color, heavy in quality, and coagulates. Its shape is usually lumpy, and although the surface may be rusted, it will show a metallic luster when worn. Its melting also requires high temperature. After melting, it flows like a liquid, and when it is cold, it coagulates into a body. And lead is malleable and can be beaten and thinned, but it is not as much as gold and silver.
Mercury, commonly known as mercury, is liquid at room temperature. It is silver-white and has a metallic light. It flows and flickers freely. Its quality is heavy, and it is smooth to the touch. Mercury is highly volatile, gradually dissipates in the air, and its vapor is toxic. If it is placed in the object, the light object floats on the top, and the heavy object sinks on the bottom, because of its density. Mercury can dissolve many metals, such as gold, silver, etc., to form amalgam, which is its difference from other things.
Both lead and mercury are produced in heaven and earth, and among the hardware, each has its own characteristics. Lead is heavy and heavy, and mercury is volatile with flow. The properties of the two, either condensation or flow, or solid or liquid, in creation, each has its own wonders, used by craftsmen, and also valued by alchemists. They are used in alchemy, pharmaceuticals, and utensils casting. They are all useful, but they should be careful, because they are toxic or can hurt people.

The method for synthesizing 4-acetyl-2-pentanone, which has a long end, is described in this article.
First, it can be obtained by ethyl acetoacetate method. First, ethyl acetoacetate is used as the starting material. Under suitable conditions, such as alcohol, the nucleus is substituted and reversed. In the next generation, the alkyl group conforms to the requirements of the target molecule. In this way, it is easy to obtain 4-acetyl-2-pentanone in the steps of hydrolysis and carboxylate, and the middle product is easy to separate and extract. However, the requirements for the degree of raw materials are high, and the steps are slightly complicated.
Second, the synthesis of acetone and formaldehyde as raw materials. Acetone and formaldehyde under the action of chemical catalysis, the generation of formaldehyde is reversed. The chemical catalysis can be oxidized and the like, and this step can generate the aldehyde addition of the phase. And then, water, addition and the like are reversed, and 4-methyl-2-pentanone can be obtained. In this way, the raw materials are easy to obtain, the cost is low, and the cost is low. However, the performance is controlled, and it is easy to produce side effects, and the yield of the affected compound is low.
In addition, there is also a synthesis method of the starting material of the ethoxyethane derivative. The oxyethane derivative contains carbonyl compounds. Under a specific catalytic system, the organic addition is reversed, and the basic skeleton of the molecule is established. In order to obtain 4-alkyl-2-pentanone, the special feature of this method is that the atom of the reaction is high, and the atoms of the raw material can be effectively used, so that the catalyst can be used to achieve the desired reaction effect.
Of course, the synthesis methods have their own advantages and disadvantages. In the application, the appropriate synthesis method is considered according to the availability of raw materials, cost considerations, feasibility of the reaction parts, and the requirements of the material quality.

Where mercury is stored, we should be cautious. Mercury is also a poison, and it can cause great harm if we are not careful.
Where mercury is stored, it is the first to be densely packed. It must be made with a solid and dense device to prevent it from escaping. Because it is easy to cause the mercury to evaporate into people's bodies, and it is very strong. And hide it where it is appropriate to avoid the dry and dry, to avoid the source of fire, so as to prevent it from being accelerated. Nor should it be placed with other things, for fear of causing the chemical reaction, which will cause it to be damaged and dangerous.
Mercury, the device must be solid and reliable. The container used is not shaken or covered on the way, and it is leak-proof. If there is a leakage of mercury on the way, take appropriate measures immediately. Quickly isolate the mercury, evacuate people, and do not let people near the leakage place, so as to avoid poisoning. Coating the mercury with sulfur powder to synthesize mercury sulfide, its toxicity is high, and then clean it up.
In addition, the storage of mercury is subject to strict regulations. The amount and direction of mercury are so that there is a good way to follow. It is not allowed to cause mercury to be contaminated with water and soil, and it is not safe to eat. In addition, the storage of mercury, which is essential for the well-being of people and the safety of the environment, is indispensable. A little neglect, and serious trouble.

Looking at the price of rice in the city today, the situation is complicated and influenced by various factors.
The weather is one of the main reasons for it. If the weather is good at the age, the fields are prosperous, the rice crops are abundant, and the rice valleys in the city are full, the price will be stable or drop. On the contrary, in case of floods, droughts, insects and locusts, the crops are not harvested, and the grain supply is scarce, the price of rice will skyrocket. In the past, a county had a severe drought, the fields were cracked, the rice crops were scorched, and the price of rice doubled between ten days, and the people suffered.
The policy of government is also related to the price of rice. If the government practices the law of flat sales, buying grain and storing warehouses in the year of abundance, and leaving warehouses in the year of famine to benefit the people, and suppressing merchants from hoarding and gathering, the price of rice will be safe. And if taxes are appropriate, farmers have no burden and are happy to cultivate, the circulation of grain goods will be unimpeded, and the price will be appropriate. In the past, there were local officials who lightly reduced taxes and encouraged farmers to cultivate, so that the price of rice would be stable and people's livelihood would be happy.
The camp of merchants has a great impact on the price of rice. Rich merchants, if they take advantage of the time to shoot profits, hoarding grain and reluctant to sell, waiting for the price, will inevitably lead to a shortage of rice in the market, and the price will be like a runaway horse. However, if there are many merchants and fierce competition, and each wants to sell his goods quickly, the
Furthermore, the needs of the four places also depend on the change of rice prices. If the neighbors are hungry and there are many people who come here to buy grain, the price of rice in the local area will also rise. In case of war and chaos, the military will collect grain, and the price of rice will also rise.
As for Krabi, the price of its market varies according to the above factors. In good years, Krabi is of high quality and sufficient quantity, and the price may be slightly higher than that of normal rice, but it is not too high. Because the supply is still abundant, merchants compete for sales. In case of disaster, Krabi is also affected, and because of its good quality, or more favored, the price may rise more than other meters. If the government regulates effectively, suppresses the disadvantages of business, and helps farmers produce, although the price of Krabi fluctuates, it can still be in a state that the people can afford. In general, the market price of Krabi is impermanent, and it can only be known by looking at the times, policies, business conditions, and changes in supply and demand.