Pyridine, 2-bromo-4-methyl-3-nitro-

Because I don't know the specific product referred to, the following is an example of "cinnabar", modeled on "Tiangong Kaiwu" and answered in classical Chinese form:
Cinnabar, also known as Dan sand, is a common mineral. Its color is red, cold in nature, and toxic. Although "Tiangong Kaiwu" does not specify its chemical composition, according to today's chemical understanding, the main component of cinnabar is mercury sulfide (HgS).
This mercury sulfide, mercury, and metal elements are also liquid at room temperature, with a silver luster, sexually active, and easy to combine with others; sulfur, non-metallic elements, yellow in color, and more stable in nature. The two combine to form cinnabar. Cinnabar is found in nature, often in low-temperature hydrothermal deposits, and coexists with minerals such as quartz and calcite.
The use of cinnabar has been around for a long time. The ancestors of ancient times saw its bright red color and worshiped it as a divine object, which was mostly used for sacrifice and alchemy. In Taoist alchemy, cinnabar is the medicine required, and if you want the elixir of longevity, you mostly use cinnabar as the foundation. After refining in various heat conditions, you can turn mercury into gold and obtain the medicine of longevity. Although the method is many fallacies, it can also be seen that cinnabar is heavy in alchemy.
As for medicine, cinnabar is also used. Traditional Chinese medicine uses its calming and detoxifying effect to treat heart palpitations, insomnia, and mania. However, because it contains mercury poison, today's medication should be carefully weighed. It is not necessary to use heavy evidence to prevent the accumulation of mercury poison and harm the human body.
The beauty of the color of cinnabar is also applied to craftsmanship. Ancient lacquerware is often colored with cinnabar, painted on utensils, with bright colors and will not fade away for a long time, making the lacquerware more luxurious. Calligraphy and painting pigments, cinnabar is also a high-quality color, painted on silk paper, over the years and not dark, so it is favored by painters.

The physical properties of 2-% hydrazine-4-methyl-3-furanyl ethylene are as follows:
This substance may be in a liquid state at room temperature, or in a clear state. Due to the characteristics of the groups in the structure, there is not too much complex cross-linking to cause it to be in a solid state. Its color may be nearly colorless, and it is less discolored due to the weak absorption of the electron transition energy level in the visible light region within the molecule.
The smell, or a special smell, originates from the chemical properties of functional groups such as furanyl and hydrazine groups. The interaction of such groups makes the smell unique.
As for the boiling point, it may be within a certain range. The existence of the furan ring makes it have a certain van der Waals force between molecules. Coupled with the influence of methyl and hydrazine groups, the boiling point will not be too low. Due to the mutual restraint between the groups, more energy is required to overcome the gasification caused by the intermolecular force. In terms of the melting point of
, because its structure is not a regularly arranged crystal, and the interaction between the groups is complex, the melting point may not be too high, and due to the hydrogen bond and steric resistance effect in the molecule, it is not easy to melt and is in a specific temperature range. In terms of solubility, hydrazine groups have a certain hydrophilicity and may have a certain solubility in polar solvents such as water and alcohols. However, furan groups and methyl groups are hydrophobic groups, and they are limited in water. In some organic solvents such as ethers and esters, the solubility may vary due to the principle of similar miscibility, depending on the degree of force matching between the solvent and the substance molecules.

2-% ether-4-methyl-3-furanyl ethylene is mainly used in many fields. In the fragrance industry, this compound can give products a unique aroma due to its unique chemical structure. Due to the synergistic effect of its ether structure and furanyl ethylene part, it can create a fresh and deep aroma layer. It is often used as a key fragrance ingredient in the formulation of high-grade perfumes and flavors, adding a unique flavor to products and attracting consumers.
In the field of pharmaceutical and chemical industry, it has become an important synthesis intermediate. Its special molecular structure provides a basis for the synthesis of a variety of biologically active drug molecules. Studies have found that through structural modification and transformation, drug precursors targeting specific disease targets can be obtained. For example, in the development of anti-tumor drugs, 2% ether-4-methyl-3-furanyl ethylene is used as the starting material to construct the compound structure with potential anti-cancer activity through multi-step reaction, which provides the possibility for anti-cancer drug innovation.
In organic synthetic chemistry, this substance is an extremely useful synthetic building block. Due to the presence of reactive functional groups in the molecule, such as ether bonds and vinyl groups, it can participate in various organic reactions, such as nucleophilic substitution, addition reactions, etc. Chemists use this to design and synthesize complex organic molecular structures, expand the variety and properties of organic compounds, and promote the development of organic synthetic chemistry.
In food additives, it can be used as a flavoring agent. Adding an appropriate amount of 2% ether-4-methyl-3-furanyl ethylene to the production of baked goods and beverages can significantly improve the flavor of food, make it emit an attractive aroma, improve food quality and consumer acceptance, and increase product market competitiveness.

To prepare 2-bromo-4-methyl-3-nitrobenzene, the following method can be used:
Take toluene first, and carry out nitration reaction with mixed acids (concentrated sulfuric acid and concentrated nitric acid) at a suitable temperature. The methyl group of toluene is an ortho-site group. Although ortho-site products are also formed, due to steric hindrance, nitro groups are mainly introduced into methyl para-sites to obtain p-nitrotoluene. The key to this step of reaction is to strictly control the temperature. If the temperature is too high, it is easy to cause the formation of polynitro substitution by-products.
Then, the bromination reaction of p-nitrotoluene and bromine occurs under the catalysis of iron bromide. Due to the nitro group being the meta-localization group and methyl being the ortho-para-localization group, combined with the localization effect of the two, the bromine atom mainly introduces methyl ortho-site and nitro-meta-site to obtain the target product 2-bromo-4-methyl-3-nitrobenzene. In this step, attention should be paid to the amount of catalyst and the purity of the reaction system, so as not to affect the reaction rate and product purity.
Another idea is to bromide toluene first, and use iron bromide as the catalyst. Due to the localization effect of methyl, the bromine atom mainly enters the ortho-and para-site of methyl to obtain a mixture of o-bromotoluene and p-bromotoluene, and obtain o-bromot After that, the o-bromotoluene is nitrified again. Due to the co-localization effect of bromine and methyl, nitro can be introduced into the ortho-position of bromine and methyl interposition, and 2-bromo-4-methyl-3-nitrobenzene can also be obtained. However, this route has more separation steps and the operation is slightly complicated.
In short, by reasonably designing the reaction sequence and using the localization effect of the substituent, 2-bromo-4-methyl-3-nitrobenzene can be effectively synthesized. In practical operation, factors such as reaction conditions, yield and separation difficulty should be comprehensively considered to choose the optimal synthesis path.

2-% -4-methyl-3-furanylenes should pay attention to the following things in the process of storage:
First, because of its chemical activity, the degree and degree of storage in the environment need to be controlled by the grid. It is suitable to be placed in a place that is dry and well-connected, and the source of ignition and pollution. High degree, or cause it to accelerate, or even lead to chemical reactions, causing the composition to be changed; high degree, it may make it damp and affect the product.
Second, this compound or some substances are anti-biotic, so it is necessary to avoid the coexistence of oxidizing, original, acid and other substances. In case of oxidation, or strong oxidation and anti-reaction, it is dangerous.
Third, the integrity of the package is of paramount importance. Use appropriate packaging materials to ensure a good seal and prevent leakage.
Fourth, do a good job of warning.
The storage or the use of tools is essential to remind people to operate carefully.
Therefore, 2-% 4-methyl-3-furanylenes should be paid attention to in various aspects such as storage, environmental protection, physical compatibility, packaging, and warnings in order to ensure their safety.