5-phenylthiophene-2-carboxylate

In the case of potassium borate, its transformation is very good. Boron, which is in the phase table of elements, is very active, and it is also often a gold element. The boric acid formed by the combination of the two is very delicate and special.
Boron atoms in boric acid are often in the form of multi-coordination. Or triangular plane coordination, or four-sided coordination. In the triangular plane coordination, the boron atoms are three-dimensional oxygen atoms, which form a solid plane. In this case, the boron oxides are in the middle of the short range, and the angle is adjusted, which gives the boric acid a certain degree of characterization. And the four-sided coordination, the boron atoms are four-dimensional oxygen atoms, which form the four-sided coordination, so that the whole is more complex.
atoms also play an important role in the formation of boric acid atoms. The atoms are usually located around the boron-oxygen skeleton, and the boron-oxygen molecules are attracted to each other through the action of the boron-oxygen skeleton. The interaction of these molecules does not determine the stability of the whole boric acid, but also affects its physical properties.
The crystals of boric acid are often interconnected by boron-oxygen polymers and shared oxygen atoms, forming various types of atoms. In these molecules, there is not only a strong co-action, but also the stability of the boron-oxygen skeleton, and there is a weak reaction, which guarantees the combination of boron-oxygen molecules. Such an ingenious arrangement makes boric acid have many special properties, such as exhibiting unique properties in light, light, and other fields, and is a good example of mutual interaction.

Borax is a common mineral. Its main uses are quite extensive, with medicinal, industrial and edible uses.
In the way of medicinal use, borax has the effect of clearing away heat and detoxifying, reducing swelling and antiseptic. It can treat sores on the tongue, swelling and sore throat, blindness and other diseases. "Compendium of Materia Medica" says: "Borax is sweet in taste, slightly salty, cold in nature, and non-toxic." Ancient physicians often used borax as medicine, such as ice boron powder for swelling and sore throat. Borax is the medicine, and it can be used to clear away heat and reduce swelling, so that the swelling and pain can be eliminated.
In industrial use, borax is also widely used. In the glass industry, it can enhance the thermal stability of the glass, make it more resistant to temperature changes, and improve the transparency and gloss of the glass. In the enamel industry, it can be used as a flux to make the enamel glaze easier to melt, evenly covering the surface of the utensils, enhancing the corrosion resistance and aesthetics of the enamel. In the metallurgical industry, borax can be used as a flux for steelmaking to remove impurities in steel and improve the quality of steel.
However, in terms of consumption, although borax was used in food processing in the past to increase the toughness, brittleness and preservative of food, it is now strictly prohibited. Borax is toxic, and if eaten in excess, it can cause human poisoning, damage the digestive system, nervous system, etc., and even endanger life.
In summary, borax has a variety of uses, medicinal use can cure diseases and save people, and industrial use can promote production and development. However, the harm of consumption is huge, and it should be avoided with caution.

The synthesis methods of 5-benzylpyrimidine-2-carboxylic anhydride are divided into ancient methods and modern methods.
In ancient times, the combination of this compound followed the path of natural extraction. At that time, the Fang family found traces of it in natural things, or collected plants and trees, or took various earth and rocks. First, the method of water leaching and wine staining was used to dissolve the substance containing the substance, and then distillation and condensation were used to purify it one after another. However, this method is time-consuming, and the yield is low. The obtained substance often contains impurities, which is difficult to purify.
Today's synthesis methods are more complicated and delicate. One is the method of chemical synthesis. Using suitable organic compounds as starting materials, by means of chemical reagents and specific reaction conditions, wonderful changes occur between molecules, and gradually build the structure of the target molecule. For example, pyrimidine derivatives and benzyl halide are used as groups, and benzyl is introduced under the catalysis of alkali. Then, after acidification, dehydration and other steps, 5-benzylpyrimidine-2-carboxylic anhydride is finally obtained. This process requires fine regulation of reaction temperature, time and reagent dosage. If there is a slight difference, the product is impure or the yield is not high.
The second method is biosynthesis. With the help of the specific catalytic ability of microorganisms or enzymes, natural biochemical reactions are simulated. Microorganisms with a specific metabolic pathway are selected and raised in a suitable medium to synthesize 5-benzylpyrimidine-2-carboxylic anhydride between growth and metabolism. Or extract enzymes with corresponding catalytic activities to build a reaction system in vitro to promote substrate transformation. The biosynthetic method has mild conditions and is green and environmentally friendly. However, the screening and culture requirements for microorganisms and enzymes are quite high, and the technical threshold is not low.
In short, although today's synthetic method is more efficient and accurate than the ancient extraction, it requires profound knowledge and exquisite skills to obtain pure 5-benzylpyrimidine-2-carboxylic anhydride.

Borax is a common mineral with many unique physical properties.
In terms of morphology, borax is often colorless and translucent crystal, or white powder. Its crystals are mostly plate-shaped or columnar, with a regular appearance and a crystal surface. It shines brightly. Under specific light angles, it refracts a wonderful luster, just like a carefully carved gem.
Borax has a low hardness, with a Mohs hardness of about 2-2.5. It is relatively soft in texture and may leave marks when scratched with a fingernail. This property makes it relatively easy to shape during processing and can meet different process needs.
In terms of solubility, borax is soluble in water, and the degree of solubility increases significantly with increasing temperature. In hot water, borax can dissolve quickly to form a colorless and transparent solution; in cold water, the dissolution rate is relatively slow.
Furthermore, borax has a low melting point, about 741 ° C. When heated to this temperature, borax will change from solid to liquid and become a flowable melt. This property makes it an important application in metallurgy, glass manufacturing and other fields. It can be used as a flux to reduce the melting point of other substances and promote the reaction.
In addition, the density of borax is relatively small, about 1.73g/cm ³. Compared with many common minerals, it is lighter in weight, which makes it more convenient to transport and use borax.
The physical properties of borax make it widely used in many fields such as chemical industry, medicine, metallurgy, glass, etc., and become an indispensable industrial raw material.

In today's city, the price of high-quality malt candy varies from top to bottom due to factors such as product quality, land quality, and supply and demand.
Generally speaking, the price of high-quality malt candy is between 20 and 40 yuan per catty. If its quality is high, the materials are well used, or it comes from a famous place, the price is slightly higher, and the price per catty may reach 50 or even 60 yuan.
As for the batch price, due to the large quantity, the price may be increased. If the amount is one stone, the price per catty may be reduced to about 18 to 35 yuan.
And the market situation is instantaneous. If the demand is strong, the price may also rise; on the contrary, if the supply is in demand, the price may have a lower price. So if you want to know the exact price, you still need to go to the market and the merchants before you can get it.