This is related to the chemical properties of 2,5-diene-4-cyanonaphthalene. In this compound, the presence of alkenyl and cyanyl groups endows it with unique chemical activities. The alkenyl group is rich in electrons and has nucleophilic properties, which makes it easy to react with electrophilic reagents, such as the common electrophilic addition reaction. In the case of strong electrophilic reagents, the electron cloud at the double bond of the alkenyl group can interact with it, so that the reagent is added to the double bond to form a new compound. This process can change the molecular structure and function.
Cyanyl group acts as a strong electron-absorbing group, which affects the distribution of the electron cloud of the compound and reduces the density of the electron cloud around it. This not only changes the polarity of the molecule, enhances its solubility and reactivity, but also decreases the electron cloud density of the carbon atom in the ortho-cyano position, making it more susceptible to nucleophilic attack and nucleophilic substitution or addition reactions. For example, it can react with nucleophilic reagents containing active hydrogen, such as alcohols, amines, etc., under specific conditions to generate new nitrogen-containing or oxygen-containing derivatives.
From the perspective of conjugation effect, the double bond and cyano group in 2,5-diene-4-cyanonaphthalene may form a conjugated system. The conjugated system can delocalize electrons, enhance molecular stability, and affect their spectral properties and reactivity at the same time. In the ultraviolet-visible spectrum, due to the presence of the conjugated system, a specific absorption peak will appear, which is helpful for compound identification and structural analysis.
In chemical reactions, the conjugated system will change the selectivity of the reaction check point. Due to electron delocalization, the reactive active center may not be limited to the double bond or the cyano group itself, and other positions on the conjugated chain may also participate in the reaction. This provides more possibilities for organic synthesis design. By controlling the reaction conditions, the reaction can be guided to occur at the desired position to synthesize the target product.

Boron is active and widely used. It is used in industry and involves high-tech fields. In the electronics industry, boride is often a key material for semiconductor manufacturing, which can optimize the performance of chips, help electronic devices move towards high speed and high efficiency, make computing processing more agile, and help the rapid development of the information age.
In the glass industry, the power of boron is also apparent. Adding boron to glass raw materials can greatly improve the heat resistance and corrosion resistance of glass. For example, borosilicate glass commonly used in laboratories has excellent thermal stability and can withstand sudden cold and sudden heat without cracking, providing reliable equipment for scientific research experiments; thermal insulation glass for buildings can also optimize the thermal insulation effect and achieve the purpose of energy saving and consumption reduction.
Titanium diboride, with its high hardness, wear resistance, electrical conductivity and other characteristics, is particularly important in the manufacture of cutting tools. With this knife, the edge is sharp and durable, which can efficiently process hard and brittle materials and improve industrial production efficiency and accuracy. In the field of metallurgy, titanium diboride can be used as an additive to improve the microstructure of metal materials, enhance their mechanical properties, and make metal products tougher and more durable.
Cyanoboron is a key reagent in organic synthesis chemistry. It often participates in catalytic reactions and can efficiently form carbon-carbon and carbon-heteroatomic bonds, which can help synthesize a variety of complex organic compounds. In drug development, cyanoboron can help synthesize new drug molecules, providing the possibility to overcome difficult diseases; in the field of material synthesis, organic materials with special properties can be created to meet the needs of different application scenarios.
Boron and its compounds play an irreplaceable role in industry, scientific research, material synthesis and many other aspects. With the advance of science and technology, its application prospects will also be broader.

The method of making cheese is quite exquisite. First, the selection of ingredients is the key. For water, you must take those that are clean and cold, preferably mountain springs, followed by well water, and avoid turbid water. For grains, choose those that are plump and flawless, millet, millet, rice, and sorghum, depending on the season and preference. Second, the cooking work needs to be fine. Wash the grains clean and cook them in a kettle. It is essential to control the heat. Do not rush or slow down, so that the grains are fully cooked and not burnt. Third, the method of fermentation is the core. Let the things to be cooked cool to a suitable temperature, and add leaven. This leaven may be a good product retained in the old year, or a special curly tiller. Then seal the container, place it in a warm and ventilated place, and wait for fermentation. During this period, the temperature and humidity should be checked frequently to prevent excessive or insufficient fermentation. Fourth, the purification of the filter residue should not be ignored. When the fermentation is completed, the residue is filtered off with a fine filter screen to make the cheese pure in texture and better in taste. In this way, you can get mellow cheese.

Mercury is a highly toxic substance, and many matters need to be taken with caution when storing and transporting it.
Mercury has special properties, is liquid at room temperature, and is volatile, and its vapor is highly toxic. Therefore, when storing, a sealed container must be selected to prevent the evaporation of mercury from escaping and endangering the people around it. The material of the container also needs to be carefully checked, such as metal iron, which reacts weakly with it, and can be used to store mercury; however, metal copper reacts easily with it, so it is never used.
Furthermore, the density of mercury is very high, and the storage device must be strong enough to withstand its weight to prevent mercury leakage due to container damage.
When transporting mercury, the first heavy packaging is tight. Not only to ensure that the container is well sealed, but also to set an obvious toxic label on the outer package so that others can identify and be vigilant. During transportation, try to avoid vibration and collision to prevent damage to the package and the outflow of mercury liquid.
If mercury leakage unfortunately occurs, take prompt measures. Evacuate the surrounding people to prevent inhalation of mercury vapor. When dealing with mercury leakage, you need to wear professional protective equipment, such as gas masks, rubber gloves, etc. Sulfur powder can be sprinkled on mercury, which reacts to form mercury sulfide to reduce toxicity, and then properly collected and disposed of.
In addition, diethyl ether is volatile and flammable. When storing, it should be placed in a cool and well-ventilated place, away from fire and heat sources, to prevent combustion and explosion caused by excessive temperature. And it should be stored separately from the oxidizing agent to avoid dangerous reactions.
When transporting diethyl ether, the vehicle must be equipped with fireproof and explosion-proof devices. During loading and unloading, care must be taken to prevent the leakage of diethyl ether caused by damage to the container. Once leaking, the fire source should be cut off immediately, evacuate people, and absorb and deal with inert materials such as sand.
As for benzyl chloride, it is a toxic and corrosive chemical. When storing, it should be selected in a cool, dry and ventilated place to avoid moisture, because it may hydrolyze in contact with water, which will affect the quality and produce harmful substances. It should also be stored separately from oxidizing agents and alkalis to prevent reactions.
When transporting benzyl chloride, the packaging should be tight and able to withstand certain pressure and corrosion. Transportation personnel need to be familiar with its dangerous characteristics and emergency treatment methods. If there is a leak, quickly evacuate the personnel in the contaminated area. Emergency personnel wear gas masks and anti-corrosive clothing to deal with it. Small leaks can be adsorbed by sand, etc. Large leaks need to be built embankments or dug for containment, and then properly disposed of.

Mercury is highly toxic. It has a great impact on the environment and human health.
Mercury is highly volatile. In the natural environment, it can be widely distributed through atmospheric circulation. If it exists in water bodies, such as rivers and seas, it is easy for aquatic organisms to ingest. Like the 2,5 dioxins, it is also a very harmful substance in the environment, both of which can cause ecological imbalance. After aquatic organisms accumulate mercury, it is transmitted through the food chain layer by layer, and eventually enters the human body.
If the human body ingests mercury, its poison can damage the nervous system, causing tremors, insomnia, memory loss, and even mental disorders. And mercury also has serious damage to the kidneys, affecting its excretion function, making it difficult to excrete metabolic waste in the body, causing disorders in the body.
If ethylene oxide is released in large quantities in the environment, it will destroy the atmospheric ozone layer, and then increase the ultraviolet radiation on the surface, threatening the survival of organisms. If the human body is exposed to ethylene oxide, the respiratory tract bears the brunt, causing cough, asthma, and even pulmonary edema. Skin contact causes redness, swelling, itching, and burns.
Formaldehyde is a common harmful substance that exists in newly renovated residences and is volatile for a long time. People are exposed to this environment, and their eyes, nose, and throat are irritated, causing tears, runny nose, and sore throat. Long-term exposure increases the risk of cancer, such as leukemia, nasopharyngeal cancer, etc.
Therefore, mercury, 2,5 dioxin, ethylene oxide, and formaldehyde are all extremely harmful to the environment and human health. The world should pay attention to it, and use scientific methods to reduce its content in the environment to ensure ecological balance and human health.