quinoline-2-carbaldehyde

"Tiangong Kaiwu" records that the main uses of ramie are as follows:
One of the main uses of ramie is to weave summer cloth. The ramie fiber is slender and tough, shiny, strong, and absorbs moisture and dissipates heat quickly. The woven summer cloth is light and thin in texture, breathable and sweat-permeable, and is an excellent choice for summer clothing. "Its quality is light and cool, and it is suitable for summer clothing. It has no sweat and sticky skin." The clothes made by the ancients in summer ramie summer cloth are cool and comfortable, and can save energy and effectively resist heat in hot summer.
The second can be used for papermaking. The ramie fiber is suitable in length and flexible in texture, making it a high-quality raw material for papermaking. Paper made of ramie has close interweaving of fibers, tough texture, and good anti-wear and anti-moth-eating properties. This paper can be used for writing, and the handwriting can be preserved for a long time; or it can be used for printing books, which can make books last a long time.
Third, it can make ropes. Ramie fiber has high strength, and after being rolled into ropes, it has strong tensile force, wear resistance and durability. Whether it is used to bind objects in daily life, or in agricultural production for traction, tying farm tools, etc., or in construction engineering, water transportation and other fields, ramie ropes play an important role.
Fourth, it can be used to make fishing nets. Ramie fiber has certain waterproof properties, and the fishing net made can be soaked in water for a long time without perishable. It can play a better role when fishing, helping fishermen harvest a lot.
Ramie was indispensable in many aspects of ancient life, from clothing to daily necessities, from cultural transmission to production and labor, all of which showed important value.

Mercury, commonly known as mercury, is one of the metals recorded in "Tiangong Kaiwu". Mercury has unique physical properties and is quite strange.
Mercury is in a liquid state under room temperature and pressure, which is very different from many common gold when it is in a solid state at room temperature. Its color is silver-white and shiny, like flowing silver, and it looks smart and beautiful.
Mercury has a high density, about 13.6 times that of water. When placed on a liquid mercury, if its density is less than that of mercury, it will float. This property is similar to that of water, but it is unique due to its extremely high density.
Furthermore, mercury has excellent fluidity, as if nothing can stop it, dripping in a flat place, it immediately flows in all directions, aggregates into drops, round and smooth, just like mercury beads rolling.
The melting point of mercury is very low, only -38.87 ° C, so it is liquid in common temperature environments. And its boiling point is relatively high, about 356.6 ° C. This property allows mercury to maintain a liquid state for a long time within a specific temperature range, which can be used in many special scenarios.
In addition, the surface tension of mercury is quite large, resulting in a nearly perfect spherical shape of mercury droplets, which is not easy to spread out, as if it has an inward contraction force and maintains its own form. This physical property is also unique to mercury, making it unique in many experiments and applications.

Lead and mercury, the master of hardware, the supreme of eight stones, are hard and dry in nature, black and heavy in color.
Lead, its quality falls heavily, and it flows in case of fire, with the nature of sedimentation. In terms of alchemy cultivation and ancient alchemy, lead is often the key thing. It can be in harmony with many gold and stones to form changes. However, its nature is fierce, if used improperly, it is prone to disaster. In the past, there were many people who used lead into medicinal pills to desire longevity, but caused illness due to lead poisoning.
Mercury, commonly known as mercury, at room temperature, is like silver like water, flowing indeterminately. Its nature is extremely lively and volatile. Mercury is good at changing and can form amalgam with various metals. The ancient alchemists used mercury to refine alchemy, hoping to use its lively nature to stimulate medicinal power and stimulate the transformation of gold and stone. However, the toxicity of mercury should not be underestimated. If you are not careful, inhaling its vapor will harm your body and mind.
Both lead and mercury are toxic. Although it has certain uses in ancient chemistry, alchemy and other fields, it can be used because of its toxicity. When using it, you must be very cautious. The ancient sages knew the properties of mercury and lead, and when using it, they must follow the ancient methods, carefully observe the heat, and strictly investigate the compatibility to prevent accidents. People today should also understand the benefits of its chemical properties. When using it in industry and scientific research, they must strictly abide by norms to ensure safety and avoid poisoning.

The common methods for synthesizing alkynes include the following:
First, the elimination reaction of halogenated hydrocarbons. This is an important way to prepare alkynes. Select a suitable halogenated hydrocarbon, usually o-dihalogenated or co-dihalogenated hydrocarbons. In a strong alkali environment, such as co-heating with potassium hydroxide in an alcohol solution, the halogen atom will be removed in the form of hydrogen halide together with the hydrogen atom on the adjacent carbon atom. After two elimination reactions, alkynes are formed. For example, 1,2-dibromoethane is heated in an alcohol solution of potassium hydroxide to form acetylene. The key to this method is that the structure of the halogenated hydrocarbon needs to be suitable, and the strength and reaction conditions of the base are also crucial. If the structure of the halogenated hydrocarbon is not suitable, by-products such as olefins may be formed.
Second, it is prepared from acetylene and alkynides. Acetylene has an acidic hydrogen atom and can react with strong bases such as sodium metal and sodium amide to form acetylene metal salts, that is, alkynides. The alkynides can undergo nucleophilic substitution reactions with halogenated hydrocarbons, and then form higher alkynes. For example, acetylene reacts with sodium amide to form sodium acetynes, and sodium acetynes react with bromoethane to obtain propane. In this way, primary halogenated hydrocarbons are generally selected for halogenated hydrocarbons, otherwise elimination reactions are prone to occur and the yield of alkynes is reduced. At the same time, the reaction needs to be carried out in an anhydrous environment, because water will react with alkynides to decompose alkynides.
Third, some metal organic compounds participate in the reaction. For example, the reaction of Grignard reagents with halogenated alkynes or alkynyl halides can form carbon-carbon bonds to achieve the synthesis of alkynes. This reaction requires more stringent reaction conditions and needs to be operated in an anhydrous and anaerobic environment. Otherwise, Grignard reagents are easily damaged by water, oxygen, etc., which affects the reaction progress. And the choice and ratio of the reaction substrate also have a great impact on the reaction result.
Fourth, some rearrangement reactions can also be used for the synthesis of alkynes. For example, under suitable catalyst or reaction conditions, certain alkynes will undergo rearrangement reactions to generate alkynes. Although this method is relatively rarely used, it has unique advantages in the preparation of some special structural alkynes. However, the catalyst selection and reaction mechanism of such reactions are complex, and further research is required to optimize the reaction conditions and increase the yield.

Mercury is a highly toxic substance. During the storage and transportation of methylmercury, you need to pay great attention to the following things:
First, the storage place must be dry, cool and well ventilated. Methylmercury is extremely volatile. If placed in a high temperature or humid place, the volatilization will accelerate, the toxicity will spread, and it will easily cause poisoning to people around it. And its volatile gaseous methylmercury is colorless and odorless, difficult for people to detect, and even more harmful. Therefore, the temperature of the warehouse should be controlled in a low range, and the humidity should not be too high to ensure smooth air circulation and timely disperse the volatile methylmercury.
Second, the choice of container is very important. Methylmercury is highly corrosive, and ordinary materials are easily corroded, causing mercury methyl to leak. When using special corrosion-resistant containers, such as specific alloys or high-grade glass containers. Such containers also have good sealing performance, which can effectively prevent the volatilization and leakage of methylmercury. Outside the container, warning words such as "highly toxic methylmercury" must be clearly marked to arouse public awareness.
Third, when transporting, strict regulations must be followed. Vehicles must be dedicated and must not be mixed with other goods to prevent pollution and accidents. Vehicles should be equipped with complete protective and emergency facilities, such as adsorption materials, protective gear, etc., in the event of a leak, they can be dealt with quickly. Transportation routes should be planned in advance to avoid densely populated areas and water sources to reduce the risk of large-scale hazards caused by leaks.
Fourth, the operator must undergo professional training. Familiar with the characteristics, hazards and correct operation procedures of methylmercury. During operation, a full set of protective equipment is essential, such as protective clothing, gloves, gas masks, etc., to avoid contact with methylmercury and the human body. And the operation process needs to be rigorous and meticulous to prevent leakage accidents caused by improper operation.
In short, the storage and transportation of methylmercury is related to human life safety and environmental safety, and it must not be slack at all. It must be operated in strict accordance with regulations and treat every detail carefully.