4,6-Dibromodibenzothiophene

4,6-Diethoxydibenzo [b, d] furan, which is an organic compound. Its physical properties are as follows:
Viewed at room temperature, it is mostly in the state of white to light yellow crystalline powder. If it is a delicate powder, it may be visible under light, and it seems to contain a shimmer, which is quite unique.
Smell it, its smell is slight, almost inconspicuous, and it is difficult to feel unless you get close to it. However, there is no pungent or special odor, and it is relatively peaceful.
Touch it, the texture is delicate, the hand feels smooth, and it is gently twisted at the fingertip, like fine sand, and it slides smoothly, without roughness or astringency.
Its melting point is about a certain range. This characteristic makes it gradually melt from solid to liquid at a specific temperature, just like ice and snow melting when warm. The melting point is an important basis for identification and purification. The boiling point also has a corresponding value. When it reaches the boiling point, it will change from liquid to gaseous and dissipate, showing the transition of substances from liquid to gaseous.
In terms of solubility, it can be moderately dissolved in organic solvents such as common ethanol, ether, chloroform, etc., like a salt melting in water, gradually fusing with the solvent; however, in water, its solubility is very small, just like oil floating in water, and it is difficult to dissolve with water. Due to the molecular structure characteristics, it determines its dispersion state in different solvents.

4,6-Diethoxydibenzofuranone, this property belongs to the category of organic compounds. It has the following chemical properties:
First, it has certain stability. Under normal conditions, the combination of benzofuranone and ethoxy in its molecular structure gives it a relatively stable structure. In case of extreme conditions such as high temperature and strong oxidants, the stability may be destroyed. In case of strong oxidants, the carbonyl group of benzofuranone may be further oxidized, resulting in structural changes and the formation of new compounds.
Second, its solubility is unique. It exhibits good solubility in common organic solvents such as ethanol, ether, and dichloromethane. Due to the lipophilicity of the ethoxy group in the molecule, it is easy to form van der Waals force with the molecules of the organic solvent, thus dissolving it. However, it has little solubility in water, because of its obvious hydrophobic properties as a whole.
Third, it is weakly acidic. In the structure of benzofuranone, it is affected by the conjugation effect of carbonyl and benzene ring, making its α-hydrogen have a certain acidity. Although the acidity is weak, in the strong alkali environment, α-hydrogen can be taken away by the base to form the corresponding carbon anion. This carbon anion has high reactivity and can participate in many nucleophilic substitution reactions.
Fourth, it can undergo electrophilic substitution reactions. The benzene ring structure endows this compound with electrophilic substitution reactivity. Due to the high electron cloud density on the benzene ring, electrophilic reagents are prone to attack the benzene ring. It is common to undergo electrophilic substitution reactions such as halogenation, nitrification, and sulfonation on the benzene ring. And ethoxy is the power supply group, which can increase the electron cloud density of the benzene ring at the o and para sites. Therefore, the electrophilic substitution reaction mainly occurs in the o and para sites.
Fifth, it can participate in the ester exchange reaction. The ester structure of the ethoxy group in the molecule can undergo ester exchange reaction with alcohol under the action of catalysts such as acids or bases to form new ester compounds. This reaction is often used in organic synthesis to modify the structure of compounds and prepare ester derivatives with different structures.

4,6-Diethoxydibenzo [b, d] furan, which was not clearly recognized and used by the world in the era mentioned in Tiangong Kaiwu. However, from today's perspective, its uses are quite extensive.
First, in the field of materials science, it can be used as an organic semiconductor material. Organic semiconductors are crucial in the fabrication of organic Light Emitting Diodes (OLEDs) and organic field effect transistors (OFETs). The molecular structure of 4,6-diethoxydibenzo [b, d] furan gives it unique electrical and optical properties, which can effectively transport charges and help improve the conductivity and luminous efficiency of devices.
Second, in the field of optics, it has good fluorescence properties and can be used in the preparation of fluorescent probes. By virtue of its response to specific substances or environmental changes, it emits fluorescence signals of different intensities or wavelengths, so as to realize the detection and analysis of biomolecules, metal ions, etc., which is of great significance in biomedical imaging and environmental monitoring.
Third, in the field of synthetic chemistry, 4,6-diethoxydibenzo [b, d] furan can be used as a key intermediate. After chemical modification and derivatization, organic compounds with more complex structures and more specific functions can be synthesized, providing rich raw materials and possibilities for the development of new drugs and the creation of new materials.
Although the use of this substance is not listed in Tiangong Kaiwu, with the progress of science and technology, 4,6-diethoxydibenzo [b, d] furans have emerged in many fields, promoting the development and innovation of materials, optics, synthetic chemistry and other disciplines.

The synthesis method of 4,6-diethoxydibenzo [b, d] furan is not directly described in the ancient book "Tiangong Kaiwu", but its chemical synthesis ideas and traditional process concepts may be used as a reference. In today's organic synthesis methods, there are the following common methods.
One is a nucleophilic substitution reaction. A suitable phenolic compound is used as the starting material and reacts with halogenated ethane under basic conditions. This is the key step for introducing ethoxy groups. The oxygen of the phenolic hydroxyl group is nucleophilic, and the halogen atom of the halogenated ethane is the leaving group. When the two meet, the phenolic oxygen attacks the α-carbon of the halogenated ethane, and the halogen atom leaves, it becomes the product of the ethoxyl substitution. Subsequent cyclization reaction, under specific conditions, the aromatic ring in the molecule is closed, and the skeleton of dibenzofuran is constructed.
Second, the transition metal catalysis method can be considered. Select suitable transition metal catalysts, such as palladium, copper, etc. The aromatic ring compound containing halogen atoms and the ethoxylation reagent, in the presence of ligands and bases, react in a suitable temperature and solvent. Transition metal catalysts can activate the substrate molecules and promote the formation of carbon-oxygen bonds. By rationally designing the substrate structure and reaction conditions, the aryl halide containing ethoxy groups is first prepared, and then the target dibenzofuran structure is constructed by intramolecular coupling reaction.
Third, you can try to use the rearrangement reaction as the basis. First synthesize the rearrangement precursor with a specific structure. Under the conditions of heat, acid or alkali, the intramolecular rearrangement reaction occurs to achieve atomic rearrangement and bond recombination, resulting in 4,6-diethoxy dibenzo [b, d] furan. This process requires precise control of the reaction conditions to ensure that the rearrangement reaction proceeds according to the expected path, so as to achieve higher yield and selectivity.
Synthesis of this compound requires considering the availability of raw materials, the difficulty of controlling the reaction conditions, the separation and purification of the product and other factors according to the actual situation. Reasonable selection of synthesis methods and careful optimization of reaction conditions can achieve satisfactory synthesis results.

4,6-Diethoxydibenzofuranone should pay attention to the following matters during use:
First, it is related to storage. This substance should be placed in a cool, dry and well-ventilated place, away from fire and heat sources. Because it may have certain chemical activity, improper storage conditions are prone to deterioration and affect its performance. If stored in a humid place, it may be eroded by water vapor, causing chemical reactions; close to heat sources, or damage its stability, and even safety.
Second, when using the operation. Be cautious and wear appropriate protective equipment, such as gloves, goggles, etc. Due to its chemical properties, it may be irritating to the skin and eyes. The operation process must be carried out in the fume hood to prevent the volatile gas from causing damage to the human body. The operation should also be slow to avoid damage to the container due to violent vibration and collision, resulting in material leakage.
Third, it is related to the use environment. It should be kept away from strong oxidants, strong acids, strong bases and other substances. 4,6-diethoxy dibenzofuranone encounters the above substances, and it is very likely that violent chemical reactions will occur, or heat, gas production, or even explosion and other serious consequences. The place of use should also be kept clean and clean, and there should be no accumulation of flammable and explosive substances to ensure the safety of the operating environment.
Fourth, waste disposal should not be ignored. Residues and related waste after use must not be discarded at will. It needs to be properly handled in accordance with relevant regulations and standards. Or collect it centrally and hand it over to a professional organization for disposal to prevent pollution to the environment and endanger the ecological balance.