1% 2C2-diethylamino-4-hydroxyquinoline, although this substance is not detailed in "Tiangong Kaiwu", it has a wide range of uses in today's knowledge.
In the field of medicine, it is an important pharmaceutical intermediate. Due to its unique structure, it has specific chemical activities and pharmacological characteristics. It can introduce other functional groups through a series of chemical reactions to create a variety of antimalarial drugs. Malaria has been around for a long time and is very harmful. In the past, doctors searched hard for good medicines to fight malaria. The antimalarial drug made of 1% 2C2-diethylamino-4-hydroxyquinoline can effectively interfere with the metabolic process of the malaria parasite, destroy its living environment, make it difficult for the malaria parasite to survive and reproduce in the human body, and save countless lives.
In the dye industry, it also has extraordinary performance. Because its molecular structure can absorb specific wavelengths of light, it can be chemically modified to become a dye with bright color and good stability. It can be used for fabric dyeing to make the fabric show rich colors, and it is not easy to fade after sun exposure and washing. In the ancient dye workshop, although I did not know this product, now this product is used as a dye, which can make the dyeing art reach a new height, weave colorful cloth, and satisfy the pursuit of beauty in the world.
In the field of chemical research, 1% 2C2-diethylamino-4-hydroxyquinoline is an ideal model compound. By studying its chemical properties and reaction mechanism, researchers can deeply understand the laws of organic chemical reactions and expand organic synthesis methods. Based on this, more new organic compounds can be developed, providing a new material basis for materials science, drug development and other fields, and promoting the continuous progress of science and technology.

1% 2C2-diethylamino-4-cyanobenzene is one of the organic compounds. Its physical properties are quite impressive, as follows:
- ** Appearance and properties **: Under normal conditions, it is mostly white to light yellow crystalline powder. This color and shape are also common in many organic compounds and can be visually recognized by the naked eye.
- ** Melting point and boiling point **: The melting point is within a specific range, and the specific value varies slightly according to experimental conditions and purity, roughly around [X] ° C. For the melting point, the critical temperature at which a substance changes from solid to liquid depends on its physical state at different temperatures. The boiling point is also a key property, about [Y] ℃, reflecting the conditions required for the substance to change from liquid to gaseous state, which is of great significance for its separation and purification operations.
- ** Solubility **: In organic solvents, such as ethanol, ether, etc., it exhibits good solubility. This property is due to the interaction between its molecular structure and the molecules of the organic solvent, which allows the molecules to be uniformly dispersed. In water, its solubility is relatively limited, due to the poor matching of molecular polarity and water molecules.
- ** Density **: Its density is about [Z] g/cm ³. If the density is, the mass per unit volume of the substance reflects its compactness. It is an important consideration in chemical production, storage and transportation.
- ** Smell **: With a slight special smell, although not pungent and unpleasant, it is still necessary to pay attention to ventilation during operation and use to prevent discomfort caused by excessive inhalation.

The chemical properties of 1% 2C2-diethylamino-4-cyanobenzene are quite stable under normal conditions. In the structure of this compound, the stability of the benzene ring endows it with a certain degree of chemical inertness. Although the diethylamino group and the cyano group have a certain activity, the interaction also stabilizes the overall structure.
From the perspective of diethylamino, the lone pair electrons on the nitrogen atom can participate in the conjugation effect, which increases the electron cloud density of the benzene ring. Although the nucleophilicity is enhanced, the structure is stabilized due to the formation of a conjugated system. Cyanyl is a strong electron-absorbing group. When conjugated with the benzene ring, the electron cloud distribution of the benzene ring can be stabilized, so that the molecular energy is reduced and the reaction is
In general environments, without specific conditions, such as high temperature, strong acid, strong base or strong oxidizing agent, reducing agent, etc., this compound is not easy to undergo chemical changes on its own. For example, at room temperature and pressure without the action of special reagents, it can maintain its original chemical state for a long time.
However, it needs to be noted that under specific reaction conditions, its chemical properties will also show activity. For example, in a strongly acidic environment, the nitrogen atom of the diethylamino group may protonate, thereby changing the distribution of molecular electron clouds and initiating reactions; at high temperatures and in the presence of specific catalysts, cyano groups may participate in reactions such as addition and substitution.
1% 2C2-diethylamino-4-cyanobenzene is chemically stable under normal conditions, but it will still show corresponding chemical reactivity when the specific environment and the reagent interact.

The synthesis method of 1% 2C2-diethylamino-4-chlorobenzene, although the method of this specific compound is not directly described in Tiangong Kaiwu, the possible path can be deduced according to the chemical related ideas and ancient methods in the book.
First, from the perspective of halogenation. The book has many records on the reaction of metals and halides, such as the reaction of metals with sulfur and mercury. For the 4-chlorobenzene part, it can be compared to the ancient method of preparing halogenates. Take benzene first, and introduce chlorine gas in a suitable container with iron filings or ferric chloride as a catalyst. This is because the benzene ring is stable, and the catalyst needs to be activated before the chlorine atom can replace the hydrogen atom on the benzene ring to generate chlorobenzene. This process requires attention to the flow rate and reaction temperature of chlorine gas to prevent over-halogenation.
Second, about the introduction of diethylamino group. Although there is no detailed description of the synthesis of organic amines in "Tiangong Kaiji", it can be deduced from its conversion ideas for various compounds. Using ethanol and ammonia as starting materials, under appropriate conditions, ethanol is dehydrated to form ethylene, and ethylene and ammonia can form ethylamine under the action of catalysts. Ethylamine is then reacted with halogenated ethane and replaced by nucleophilic substitution to obtain diethylamine. Afterwards, diethylamine is reacted with 4-chlorobenzene. In the presence of an alkaline environment such as potassium carbonate, the lone pair of electrons of the nitrogen atom in the diethylamine attacks the chlorine atom of 4-chlorobenzene to connect to the carbon, and the chlorine atom leaves to form 1% 2C2-diethylamino-4-chlorobenzene.
Third, the control of reaction conditions. According to the ancient method, the reaction is mostly carried out in open or closed ceramic or metal containers. Temperature control may be judged according to the temperature, such as the degree of firewood burning. For such organic reactions, although it is difficult to precisely control as it is today, it can be empirically maintained at a certain temperature range to ensure the reaction rate and product purity. At the same time, the reaction time is also estimated empirically, and the reaction process is judged by observing the changes in the properties of the reactants and products, such as color, smell, etc. In this way, the chemical concept of "Tiangong Kaiwu" and the traditional method can be used to conceive the synthesis of 1% 2C2-diethylamino-4-chlorobenzene.

1% 2C2-diethyl-4-bromobenzene, when storing and transporting, there are several ends to pay attention to.
First, this is a chemical substance, many of which have certain chemical activity and potential harm. When storing, choose a dry, cool and well-ventilated place. Cover it or be sensitive to humidity, temperature, high humidity, or cause chemical reactions such as hydrolysis, which will damage its quality; if the temperature is too high, it will easily cause its volatilization to increase, and even cause safety accidents.
Second, when transporting, be sure to follow relevant regulations and standards. It must be properly wrapped with suitable packaging materials to ensure that it is not damaged and leaked during transportation due to vibration, collision. If this substance leaks, or pollutes the environment, endangering the safety of humans and animals. On the packaging, its name, nature, hazard and other information should be clearly marked so that transporters and emergency responders can know.
Third, since it is an organic halide, or toxic and irritating. Storage and transportation personnel should be equipped with appropriate protective equipment, such as gloves, goggles, gas masks, etc., to prevent physical damage caused by contact or inhalation. In storage places and transportation vehicles, emergency treatment equipment and materials should also be prepared. If there is a leak, etc., it can be dealt with in time.
Fourth, during storage, it should be regularly checked whether its packaging is in good condition, whether there are any signs of leakage, and monitor the temperature and humidity of the storage environment. And it should not be mixed with oxidizing agents, strong acids, strong bases and other substances, as it may cause severe chemical reactions with them, causing serious consequences such as fire and explosion.