2-iodo-4-hydroxybenzaldehyde

4 - The goat's horn is the horn of a goat, and its main use is numerous.
In the way of And because it can clear the liver and eyesight, it can be used to clear the liver and heal the eyesight.
In terms of workmanship, the horns of the sheep can be carved into all kinds of exquisite workmanship because of their location and shape. It can be carved into a clear horn comb, comb the clothes, promote blood circulation, and is durable and beautiful. It can also be carved into exquisite products, such as horn carvings, or the shape of rui, or flowers, to add elegance to the room.
In ancient sacrifices and other rituals, the horns of the sheep also have a special meaning. The ancients made sacrifices to express the reverence of ghosts and gods in heaven and earth and ancestors. Ram horn or one of the sacrificial items, which means auspiciousness, praying for blessings and peace, five times of prosperity, and prosperity of people and animals. Its object, which represents the gods, has a place in the sacrificial ceremony of Mu, and bears the good hope and spirit of people.

4-Fluoromethylsulfonylbenzoic acid is an important organic compound. Its physical properties are quite unique. At room temperature, it is mostly in the state of white to white crystalline powder, which makes it easy to distinguish and handle.
Looking at its melting point, it is about 158-162 ° C. Melting point, as a key physical property of substances, is clearly reflected in this compound. This melting point range is relatively stable, providing a basis for its phase transition under specific temperature conditions. When the temperature gradually rises to this range, 4-fluoromethylsulfonylbenzoic acid gradually melts from a solid state to a liquid state. This process is of great significance for its applications in chemical production, material preparation and other fields.
When it comes to solubility, 4-fluoromethylsulfonylbenzoic acid is slightly soluble in water. Water is a common solvent in which the solubility of this compound is limited, but it is soluble in organic solvents such as ethanol and acetone. Such differences in solubility make it possible to dissolve, separate, and purify it in practice according to different needs. In organic synthesis experiments, the compound is often dissolved with the help of ethanol or acetone to promote the smooth progress of the reaction.
In addition, 4-fluoromethylsulfonylbenzoic acid also has certain stability. In normal storage and use environments, as long as high temperatures, strong light, and contact with strong oxidants, strong bases, and other substances are avoided, its chemical properties can be maintained relatively stable, and it is not prone to decomposition or other chemical reactions, which facilitates its storage and transportation.

In "Tiangong Kaiwu", the synthesis method of di-naphthol-4-sulfoaniline diazonium salt, although unknown in ancient times, can be deduced from similar techniques.
To obtain di-naphthol-4-sulfoaniline, first take naphthalene as the starting material and sulfonate it with sulfuric acid. When naphthalene encounters sulfuric acid, at an appropriate temperature and duration, a sulfonic acid group is introduced into the naphthalene ring to obtain naphthalene sulfonic acid. This step requires careful control of the reaction conditions. If the temperature is too high, side reactions will occur, which will affect the purity and yield of the product.
Next, the naphthalene sulfonic acid base is melted. A base (such as sodium hydroxide) is co-melted with it, and the sulfonic acid group is converted into In the alkali melting process, temperature and ratio are also critical, otherwise the product is impure.
Then, aniline is prepared. Nitrobenzene is used as raw material, and the nitro group is reduced to an amino group by iron powder and hydrochloric acid, etc., and then aniline is obtained.
Then two-naphthol and aniline are reacted under specific conditions. Or choose an appropriate solvent, adjust the pH and temperature, and promote the combination of the two to form di-naphthol-4-sulfoaniline. This step requires careful exploration of the reaction parameters to obtain the ideal product.
As for the preparation of diazonium salts, the synthesized aniline is taken and reacted with sodium nitrite at low temperature and in an acidic environment. The aniline amino group is changed into a diazo group through this reaction, and the diazo salt of di-naphthol-4-sulfoaniline is obtained. This process is particularly strictly controlled by temperature, and the high temperature decomposes the diazo salt, resulting in the failure of the experiment.
Although the ancient method did not provide details of this synthesis, according to the principle of "Tiangong Kaiwu", by analogy with various chemical techniques, the method of its synthesis can be explored. It is also instructive for today's chemical preparation.

The head of the four spirits of the husband is the dragon tortoise, and the tortoise is one of them. The tortoise, the long of the insect, rises like the sky, goes down to the flat land, bears the gossip, and contains all kinds of things. There are many taboos in the way of storage and transportation, and it should be carefully studied.
The hiding of the tortoise is the first place to live. It is necessary to choose a cool and quiet place to avoid the scorching sun and the hustle and bustle. The land should be dry and moist, with soil to live in, and water to swim in, so that it can meet the nature of the tortoise. If hidden in a filthy place, the tortoise is prone to disease and its vitality is damaged.
Furthermore, turtle food is also related to the need for storage. Turtles have a variety of food, so they need to be fed at a time, and the food should be fresh and clean. Do not be too hungry or too full. If you are too hungry, you will be weak, and if you are too full, you will hurt the spleen. If you feed raw meat, you must wash it to remove filth to prevent disease from entering the mouth.
As for the transportation of turtles, the road is bumpy, and you should strive for stability. Pad it with soft objects first to avoid collision and injury. Water needs to be given in a timely manner on the way to keep it moist. If it is not moist for a long time, the turtle body is easy to dry up.
When transporting, you should also pay attention to the temperature. Turtles are afraid of cold and heat, and they are Therefore, in summer, it is recommended to choose when it is cool in the morning and evening to transport, and in winter, you need to do a good job of keeping warm. You can wrap it in cotton wool and other things to protect it from cold invasion.
Also, when handling, the movements should be gentle and not rough grasping, so as not to shock the tortoise body. And the tortoise is timid by nature, and the disturbance should be minimized during transportation, so that it can survive the journey safely.
Hiding and transporting spiritual tortoises are all taboos, all of which are related to the life and death of the tortoise. Be sure to do it with caution, so as not to live up to this spiritual object.

Looking at the modern market, the price of 4-hydroxymethyl furfural acetate varies depending on the quality, quantity and source.
If it is an ordinary commercial product with good quality, the price per catty may be between tens of dollars and more than 100 dollars. This price depends on the current supply and demand, the simplicity of the manufacturing process, and the abundance of raw materials.
If its quality is fine and pure, it is used in high-end fields such as medicine and scientific research, and its price is very high. The price per catty may reach hundreds of dollars, or even more than a thousand dollars. Because of its extremely strict control of purity and impurities, it is difficult to make it, so the price is so high.
There is a difference in the distance of the place of origin, and the cost of transportation is also added to the price. If the place of origin is remote, if it is exported to another party, the price will increase due to the freight. And the city changes, the number of supply and demand is impermanent, and the price also fluctuates.
The actual price can only be obtained if you want to know its exact price, and when you carefully consider its quality, quantity, source, and the general conditions of the city. It cannot be generalized, but it needs to be determined according to time and local conditions.