1-Bromo-3-Ethyl-4-Iodobenzene

"Tiangong Kaiwu" is a scientific and technological masterpiece written by Song Yingxing in the Ming Dynasty, and the book contains many material properties in detail. Today, the physical properties of 1-mercury-3-ethyl-4-chlorobenzene are described in Chinese as follows:
Mercury is liquid at room temperature and is a metallic element. It is silver-white and has a metallic luster. It is heavy and has a high density, about 13.59 g/cm ³. It has excellent fluidity and is easy to form beads on a plane. Its melting point is extremely low, at -38.87 ° C, and its boiling point is not high, at 356.6 ° C. Mercury vapor is toxic and volatile in the air. < Br >
3-ethyl-4-chlorobenzene, the appearance may be colorless to light yellow liquid. It has a special odor and has an aromatic taste due to the structure of the benzene ring. The relative density is less than that of water, and it is difficult to dissolve in water, but it can be miscible with most organic solvents, such as ethanol, ether, etc. Its boiling point will vary depending on the molecular structure and relative molecular weight, and it is roughly in a certain temperature range. The specific value depends on accurate measurement. In addition, due to the chlorine atom and ethyl side chain, the molecule has a certain polarity, which affects its physical properties, such as showing unique characteristics in solubility, boiling point, etc.
4-chlorobenzene, the normal state is a colorless transparent liquid, which has a benzene-like odor. Its density is slightly higher than that of water, about 1.107 g/cm ³. The melting point is -45.6 ° C and the boiling point is 132.2 ° C. It is slightly soluble in water and miscible in most organic solvents such as ethanol, ether, and chloroform. It can evaporate in the air and is flammable. It is flammable in case of open flame or hot topic. It will decompose and produce toxic chloride gas when burned.
These substances have unique physical properties and are used in various fields such as chemical industry and scientific research. Only by understanding their properties can we make good use of them and seek advantages and avoid disadvantages.

"Mercury, its substance flows, and it flies in case of fire, like silver and white, so it is called mercury. Its properties are good for melting gold and silver, and it can also erode people's muscles and bones." Mercury, as mentioned in the title, is a liquid metal that is fluid at room temperature and volatile, and quickly vaporizes when heated. Its chemical properties are relatively active, and it can form amalgamates with a variety of metals. This property makes it widely used in metallurgy and other fields.
"Propyl" is a common group in organic chemistry. Propyl groups are stable in structure and often exist in various organic compounds. Its chemical properties vary depending on the compounds in which it is located. Generally speaking, propyl groups can participate in many organic reactions such as substitution reactions and addition reactions, and play a significant role in the field of organic synthesis.
"Terpenes" compounds are widely found in plants, such as turpentine. Their chemical properties are rich and diverse, with unsaturated structures such as double bonds, so they can undergo addition reactions, such as addition to hydrogen to generate corresponding saturated hydrocarbons. Terpenes also often have a special aroma and are widely used in the fragrance industry. At the same time, due to their unique structure, they can also participate in various chemical reactions such as oxidation and polymerization, and have important uses in chemical, pharmaceutical and other fields. < Br >
The three have different chemical properties. Mercury, as a metal element, has the typical characteristics of metals, while propyl is an organic group, which participates in the construction and reaction of organic compounds. Terpenes have shown important value in many fields due to their unique structures and properties.

In "Tiangong Kaiwu", arsenic, trimethylphenol, carbon tetrachloride, etc. are not known at the time, so the ancient classical Chinese reply to this question is only based on the similar effects and application scope of "Tiangong Kaiwu".
Arsenic, this product is highly toxic, although it is harmful, it is also useful in medicine, metallurgy and other fields. In medicine, it can be used as medicine to treat some serious diseases, but the dosage needs to be precisely controlled, and a slight mistake will endanger life. In metallurgy, it may help to separate and purify metals and play a unique role.
Trimethylphenol, which was not called at the time of "Tiangong Kaiwu". However, if it is a substance with similar characteristics, or stored in various types of plants and minerals, it can be used in dyeing, weaving, fragrance making and other industries, or can be used to add color, fragrance, and assist in the refinement of craftsmanship.
Carbon tetrachloride, no such chemical name in ancient times. However, similar soluble and volatile substances, or used in lacquer making, ink making, etc., can make the lacquer ink texture better, smear, and writing smoother.
"Tiangong Kaiji" is mostly involved in agriculture, industry, and mining. If the above substances exist, their application may be around these fields to help with sophisticated equipment, technological progress, and people's livelihood needs. However, at that time, knowledge and means were limited, and application may not be as extensive and profound as it is today.

To prepare 1-hydroxy-3-methyl-4-pyridone, the method is as follows:
First take an appropriate amount of starting material and follow the corresponding reaction steps. Or choose a suitable organic synthesis path, such as starting with a specific compound and transforming it through a series of reactions.
The first step allows a reactant to undergo a specific chemical reaction under specific reaction conditions, such as at appropriate temperature, pressure and in the presence of a catalyst, so that its structure changes and progresses in the direction of the target product. This step requires strict control of various reaction parameters to ensure that the reaction proceeds as expected, resulting in higher yield and purity. Next, the product obtained from the preliminary reaction is introduced into the next step of the reaction. This step may involve the modification and transformation of functional groups, and the molecule can be gradually constructed into the basic structure of the target product through suitable reagents and reaction conditions. For example, using specific substitution reactions, addition reactions, etc., the required groups are precisely introduced into the molecule.
Then, further optimization and adjustment are carried out for intermediate products. Protection and deprotection of some functional groups may be required to prevent unnecessary side reactions in subsequent reactions to ensure that the structure of the final product is accurate.
Then through appropriate separation and purification steps, such as distillation, extraction, column chromatography, etc., to remove residual impurities, unreacted raw materials and by-products in the reaction system to obtain high-purity 1-hydroxy- 3-methyl-4-pyridone. This series of operations requires strict chemical principles and experimental specifications to successfully prepare the target product.

Mercury, trimethylamine, pyridine and other substances need to pay attention to many matters during storage and transportation.
Mercury is a liquid metal that is volatile at room temperature, and its vapor is toxic. When storing, be sure to keep it in a sealed container to prevent mercury vapor from escaping. The container material should be stable and does not react with mercury, such as glass bottles or containers made of specific metals. The storage environment should be cool, dry and well ventilated, away from fire and heat sources, because high temperature will accelerate the evaporation of mercury. When transporting mercury, ensure that the packaging is tight to prevent leakage. Once leaked, mercury will quickly disperse into small mercury droplets, which are extremely difficult to collect and will continue to evaporate, causing serious harm to the environment and people. Transport vehicles should also have good ventilation conditions, and drivers should be familiar with mercury leakage emergency treatment methods.
Trimethylamine is a colorless gas with a strong ammonia odor, flammable, explosive and corrosive. When storing trimethylamine, a pressure-resistant and well-sealed container is required, usually a special metal storage tank. The storage place should be kept away from fire and heat sources, and stored separately from oxidants and acids, because trimethylamine will react violently when exposed to oxidants, and salt will be formed when exposed to acid. Combustible gas alarm devices and ventilation facilities should be installed to ensure environmental safety. When transporting trimethylamine, the transport vehicle must meet the transportation standards for hazardous chemicals, and be equipped with corresponding fire equipment and leakage emergency treatment equipment. During driving, avoid densely populated areas and busy traffic sections to prevent accidents and gas leakage from causing danger.
Pyridine is an organic compound with a special odor, which is flammable and toxic to a certain extent. Store pyridine in a cool and ventilated warehouse, away from fire and heat sources. The packaging should be sealed and should not be in contact with air because it is easy to oxidize. It should be stored separately from oxidants and acids to avoid reactions. The storage area should be equipped with suitable materials to contain leaks. When transporting pyridine, vehicles that meet the requirements for the transportation of hazardous chemicals should also be used. Transportation personnel should be professionally trained and familiar with the characteristics of pyridine and emergency treatment measures. During transportation, it should be protected from exposure to the sun, rain, and high temperature to ensure transportation safety.