1. ** About " (1,1 -diethylamino) " **: This expression may refer to the group contained in the chemical structure. In many organic compounds, diethylamino exists as a substituent. In diethylamino, the nitrogen atom is connected to two ethyl groups, and its structure is\ (-N (C_ {2} H_ {5}) _ {2}\). It can impart specific properties to the compound, such as changing the solubility, acidity and alkalinity of the compound and reactivity. In the field of medicinal chemistry, compounds containing diethylamino may have better fat solubility due to the presence of this group, and it is easier to penetrate the biofilm, thereby improving the efficacy of drugs. In organic synthetic chemistry, it is often used as a reaction check point to participate in various organic reactions, such as nucleophilic substitution reactions, whereby more complex organic molecular structures are constructed.
2. ** About "What is the main use of diacetonitrile" **: Diacetonitrile, also known as malononitrile, has a wide range of main uses. In the field of organic synthesis, it is a key intermediate. For example, in the synthesis of barbiturates, diacetonitrile can participate in the construction of the core cyclic structure of the drug. Through reactions such as nucleophilic addition and cyclization with different reagents, a variety of organic compounds can be derived. In the dye industry, diacetonitrile can be used to synthesize dye intermediates with specific structures, which are further reacted to produce dyes with bright colors, good light resistance and washable fastness. In the agricultural field, some compounds containing diacetonitrile structures are developed as pesticides, exhibiting insecticidal, bactericidal or herbicidal activities, which play an important role in ensuring the healthy growth of crops. At the same time, in the field of materials science, it can also participate in the synthesis of polymer materials with special properties, such as certain polymers with excellent electrical properties or thermal stability.

1 - (1,1 - diethylamino) has a complex structure and is commonly found in a variety of organic compounds. It can be used as a key active group in the field of chemical synthesis, participating in many reactions and changing molecular properties and activities.
2 - ether is a colorless and transparent liquid with a special odor. Its physical properties are as follows:
- ** Boiling point **: about 34.6 ° C. This low boiling point makes ether volatile and can quickly change from liquid to gaseous at room temperature.
- ** Density **: 0.7134g/cm ³, lighter than water. If ether is mixed with water, ether will float on the water surface and form obvious layers.
- ** Solubility **: Ether can be miscible with most organic solvents such as ethanol, benzene, chloroform, etc., but slightly soluble in water. This property makes ether often used as an extractant in organic synthesis, which can extract organic compounds from aqueous solutions.
- ** Volatile **: It is very volatile and absorbs a lot of heat when it evaporates, resulting in a decrease in ambient temperature.
- ** Burning point **: 160 ° C, is a flammable substance. In case of open flames and hot topics, it is very easy to burn and explode. Special attention should be paid to fire prevention when using it.
- ** Vapor pressure **: The vapor pressure is relatively high at room temperature, which means that it is easy to form a mixture of combustible steam and air in a closed space, posing a safety hazard.

1. On one, one, the nature of diethylamino. Diethylamino, an organic group, is alkaline, and the nitrogen atom has lone pairs of electrons, which can be combined with protons. In chemical reactions, it is often used as a nucleophilic reagent. Because the nitrogen atom is rich in electrons, it can attack atoms or groups that lack electrons.
2. Second, on the chemical properties of ethanethiol. Ethanethiol, an organic compound with a special odor. Its chemical properties are active, first of all its acidic, sulfur-hydrogen bonds are easier to break than oxygen-hydrogen bonds, so ethanethiol is slightly more acidic than ethanol. This allows it to react with bases to form corresponding salts.
Furthermore, ethanethiol has strong reducing properties. Sulfur atoms are in a lower oxidation state and are easily oxidized. In case of strong oxidants, sulfur can be oxidized to a high valence state to form sulfonic acids and other products.
And ethanethiol can undergo substitution reactions. The lone pair electrons of the sulfur atom can participate in nucleophilic substitution and react with substrates such as halogenated hydrocarbons to form new compounds containing sulfur.
In the field of organic synthesis, ethanethiol is often used as a reagent to introduce sulfur atoms or participate in the construction of complex molecular structures containing sulfur. Due to its special chemical properties, it has important applications in many fields such as chemical industry and medicine.

1. ** 1 - (1,1 - diethylamino) **: This expression seems to be related to chemical groups, but the expression is slightly vague. If it is related to organic chemistry naming, it is speculated that in describing the structure of a compound, there is a group 1- (1,1 - diethylamino), which may exist as a substituent on the backbone structure of a compound. For example, in some amine derivatives, such a substituent may appear. Two ethyl groups in the diethylamino group are connected to the same nitrogen atom, and the nitrogen atom is then connected to the No. 1 position of the parent structure.
2. ** 2 - Production method of ethylene naphthalene **:
- ** Preparation of raw materials **: Naphthalene is usually used as the starting material. Naphthalene can be extracted from coal tar in nature. By fractionating fractions of coal tar in different boiling point ranges, higher purity naphthalene can be obtained.
- ** Alkylation reaction **: Naphthalene is alkylated with ethylene under the action of a suitable catalyst. Commonly used catalysts are acidic catalysts such as aluminum trichloride (\ (AlCl_ {3}\)) or hydrofluoric acid (\ (HF\)). Taking aluminum trichloride as a catalyst as an example, the reaction mechanism is as follows: aluminum trichloride first complexes with ethylene, which changes the electron cloud density of ethylene molecules and makes it easier to undergo electrophilic substitution with naphthalene. The electron cloud density of the α-position of naphthalene is higher, and ethylene tends to attack the α-position of naphthalene to generate 2-ethylnaphthalene. The reaction equation is roughly:\ (C_ {10} H_ {8}\) (naphthalene) +\ (C_ {2} H_ {4}\) (ethylene) \ (\ xrightarrow [] {AlCl_ {3}}\) \ (C_ {12} H_ {10}\) (2-ethylnaphthalene).
- ** Control of reaction conditions **: The reaction temperature is generally controlled at about 100-150 ° C. Excessive temperature may lead to side reactions such as polyalkylation, and impurities such as diethylnaphthalene are formed; The reaction pressure depends on the specific process and equipment, usually between atmospheric pressure and several megapascals.
- ** Product separation and purification **: After the reaction is completed, the reaction system contains unreacted naphthalene, the generated 2-ethylnaphthalene, and catalysts. First, most of the unreacted naphthalene is initially separated by physical methods such as distillation, which can be recycled and used. Then, according to the difference of boiling point between 2-ethylene naphthalene and other impurities, 2-ethylene naphthalene was purified by rectifying.

1. ** On the matter of (1,1-diethylamino) **:
- (1,1-diethylamino) is a group in organic chemistry. Its structure is unique, and two ethyl groups are connected by nitrogen atoms, which has specific chemical activity. In the field of organic synthesis, it is often used as an important intermediate. Because nitrogen atoms have lone pair electrons, they can participate in a variety of nucleophilic reactions, react with halogenated hydrocarbons, form new carbon-nitrogen bonds, and construct complex organic molecular structures, and have important applications in pharmaceutical chemistry, materials science, and many other fields.
2. ** On the precautions of acetonitrile in storage and transportation **:
-acetonitrile, colorless and transparent liquid, has a special odor similar to ether, and has certain toxicity and flammability. When storing, choose a cool and ventilated warehouse, away from fire and heat sources. Because of its low flash point, it is flammable, and can cause combustion and explosion in case of open flame and hot topic. The warehouse temperature should not exceed 30 ° C, and the relative humidity should not exceed 80%. It should be stored separately from oxidants, reducing agents, acids, alkalis, etc., and should not be mixed. The storage area should be equipped with leakage emergency treatment equipment and suitable containment materials.
-During transportation, make sure that the container does not leak, collapse, fall, or damage. Transport vehicles should be equipped with the corresponding variety and quantity of fire-fighting equipment and leakage emergency treatment equipment. In summer, it is advisable to transport in the morning and evening to prevent sun exposure. Highway transportation should be carried according to the specified route, and do not stop in residential areas and densely populated areas. During railway transportation, it is strictly forbidden to slip. During transportation, it is necessary to prevent acetonitrile from being heated and collided, and to avoid leakage due to damaged packaging, which endangers the safety of personnel and the environment.