Benzene 1 Chloro 4 Iodo 2 Methyl

The name of this compound, 1-cyanogen-4-bromo-2-methylbenzene, according to the ancient classical Chinese text of Tiangong Kaiwu, can be expressed as: "There is a compound with a cyanyl group in one corner, bordering bromine on the opposite side, and methyl at the ortho position. The cyclic structure is benzene, so it can be called 1-cyanogen-4-bromo-2-methylbenzene. Among them, cyanide is a group containing three bonds of carbon and nitrogen; bromine is a halogen element, which is a substituent here; methyl is a group obtained by dehydrogenation of methane, which is connected to the benzene ring. This name depends on the position and type of the group to illustrate the characteristics of its structure." The name of this compound is based on the first position of cyano group, and the position of epicyano group; the second position has bromine, indicating where the bromine atom is; and the second position is methyl group, and the position of clear methyl group. In order to determine its chemical structure, it is important for chemical study and material identification.

Xylene is a common organic compound with the following physical properties:
Looking at its color state, xylene appears as a colorless and transparent liquid at room temperature and pressure, with a pure texture, no visible impurities, and a special aromatic odor, which is quite strong.
When it comes to volatility, xylene is highly volatile and will quickly evaporate into the air when placed in an open environment. Its vapor is heavier than air and can spread to a considerable distance at a lower location.
When it comes to solubility, xylene is insoluble in water, but it can be miscible with many organic solvents such as ethanol, ether, and chloroform in any ratio. This property makes it often used as a solvent in organic synthesis and chemical production to dissolve various organic substances. The boiling points of
xylene vary slightly according to their isomers. The boiling points of o-xylene are about 144.4 ° C, m-xylene are about 139.1 ° C, and p-xylene are about 138.4 ° C. Generally speaking, the boiling point is between 138 and 144 ° C. In terms of melting points, the melting points of o-xylene are about -25.2 ° C, m-xylene are about -47.9 ° C, and p-xylene are about 13.2 ° C. In terms of density, the density of xylene is less than that of water, about 0.86 to 0.87 g/cm ³. Such density characteristics make xylene float on the water surface if mixed with water.

The name of an organic compound is "2-methylnaphthalene". This is a fused ring aromatic hydrocarbon, which is formed by the hydrogen atom of one of the naphthalene rings being replaced by the methyl group. Its chemical properties are very interesting, so let me tell you one by one.
2-methylnaphthalene has aromatic properties. Due to the special conjugated π electronic system of the naphthalene ring, it has high stability and can undergo electrophilic substitution reactions. Its reactivity is slightly different from that of naphthalene. The methyl group is the power supply group, which can increase the electron cloud density of the naphthalene ring, especially in the methyl adjacent and para-position. Therefore, electrophilic substitution reactions are easy to occur in these two places. For example, when halogenated, the halogen atom tends to connect to the methyl ortho and para-position to form products such as 2-methyl-1-halonaphthalene, 2-methyl-4-halonaphthalene; when nitrified, 2-methyl-1-nitronaphthalene and 2-methyl-4-nitronaphthalene can also be obtained.
This compound can also participate in the oxidation reaction. If a specific oxidant is used, the methyl group can be oxidized, depending on the conditions, or form a carboxyl group to obtain 2-naphthalenecarboxylic acid; or other oxidation products such as aldehyde groups are formed.
At high temperatures and in the presence of suitable catalysts, 2-methylnaphthalene can be hydrogenated, and the naphthalene ring can be partially hydrogenated. Depending on the conditions, or a partial hydrogenation product can be formed, such as 2-methyl-1,2,3,4-tetrahydronaphthalene; if the conditions are suitable, the naphthalene ring can be completely hydrogenated to obtain a saturated cyclic compound.
In addition, 2-methylnaphthalene can undergo alkylation reaction. Under the catalysis of suitable catalysts, the hydrogen on its methyl group can be replaced by other alkyl groups to form derivatives with different alkyl substitutions. This reaction can increase the complexity and diversity of its molecular structure and is widely used in the field of organic synthesis. < Br >
2-methylnaphthalene has rich and diverse chemical properties and is of great significance in many fields of organic synthesis and chemical production. It is an important raw material and intermediate for the preparation of various organic compounds.

The main use of 2-methylnaphthalene is in various fields of chemical industry, with many functions and is quite important.
First, in the production of dyes, 2-methylnaphthalene can be used as a key raw material. After a series of delicate chemical reactions, it can be converted into various dyes with bright colors and outstanding properties. These dyes play a crucial role in the textile, printing and dyeing industries, making fabrics colorful and durable.
Second, in the process of pharmaceutical synthesis, it also plays a key role. With its unique chemical structure, it can participate in the synthesis of many drugs. Based on this, drugs with good curative effects on a variety of diseases can be prepared, making great contributions to human health and well-being.
Third, 2-methylnaphthalene also has outstanding performance in the field of fragrance preparation. After fine processing and preparation, unique fragrance ingredients can be derived. Such fragrances can impart a pleasant aroma to perfumes, cosmetics and other products, enhancing the quality and attractiveness of products.
Fourth, in the field of organic synthesis, 2-methylnaphthalene, as an important intermediate, can participate in the construction of many complex organic compounds. Through ingenious chemical reaction design, organic materials with diverse structures and unique functions can be prepared, which show broad application prospects in cutting-edge technologies such as electronics and optics. In conclusion, 2-methylnaphthalene plays an indispensable role in many aspects of the chemical industry due to its diverse uses, promoting the sustainable development and progress of related industries.

The method of preparing 2-methylfuran, although "Tiangong Kaiwu" does not explicitly mention this specific thing, it can be deduced from the principles of related ancient techniques.
One, or can be extracted from natural products containing furans. In the past, chemical raw materials were often found in natural products. Such as some essential oils of plants, metabolites of special fungi, or furan compounds. By distillation, according to the difference in boiling point, the components containing 2-methylfuran can be separated from other substances. If the mixed ingredients are obtained, they can be further separated by fractionation to obtain a purer 2-methylfuran. However, the content of this substance in natural products may be low, which is laborious and the yield is small.
Second, it is deduced from the idea of chemical synthesis. In ancient times, there were various chemical reactions, and it was possible to find raw materials containing methyl and furan structures and make them react. If you find suitable alcohols and furan-containing compounds, under appropriate catalytic conditions, a substitution reaction will be carried out. At that time, although there was no advanced catalyst today, it may be possible to use natural ores, plant ash and other alkali and acid-containing substances as catalysts. Control the reaction temperature, time and other conditions to connect methyl groups to furan rings to form 2-methylfuran. However, this reaction condition is difficult to precisely control, and the product may be complex, and it needs to be purified many times to obtain usable 2-methylfuran.
Third, or consider the conversion from biomass fermentation. The ancient fermentation technology is mature, which can make specific microorganisms ferment substrates containing suitable carbon and nitrogen sources. If the appropriate microorganisms, such as some special molds and bacteria, can be metabolized into 2-methylfuran. Adjusting the pH, temperature, ventilation, etc. of the fermentation environment may promote this conversion. However, there are many variables in the fermentation process of microorganisms, and the selection of bacteria and the optimization of culture conditions need to be repeatedly explored to effectively produce 2-methylfuran.