3-methyl-1-benzothiophene

3-Methyl-1-butyne is an organic compound with a wide range of main uses. In the field of organic synthesis, this is a key raw material. Due to its high reactivity, the alkynyl group can participate in many chemical reactions, such as nucleophilic addition reactions. Under specific conditions, nucleophilic addition can occur with active hydrogen-containing compounds, such as alcohols and amines, to construct various carbon-carbon, carbon-heteroatom bonds and synthesize complex organic compounds, which is of great significance in the fields of medicinal chemistry and materials science.
In addition, 3-methyl-1-butyne can be used to synthesize polymers with special structures. By appropriate polymerization reaction, it is introduced into the main chain or side chain of the polymer to endow the polymer with unique properties, such as improving the heat resistance and mechanical properties of the polymer, which is of great value in the preparation of polymer materials.
In the field of fine chemistry, 3-methyl-1-butyne can be used to prepare fine chemicals such as fragrances and dyes. Through specific chemical reactions, its structure is modified and transformed to obtain compounds with specific aromas or colors to meet the needs of different industries.
Furthermore, in the field of organometallic chemistry, 3-methyl-1-butyne can be used as a ligand to coordinate with metal ions. The formed metal complexes exhibit unique catalytic properties in catalytic reactions, can catalyze many organic reactions, improve reaction efficiency and selectivity, and play a significant role in promoting the development of organic synthesis chemistry. In short, 3-methyl-1-butyne has important uses in organic synthesis, materials science, fine chemistry, organometallic chemistry and other fields, providing key support for the development of related fields.

3-Methyl-1-pentyne is an organic compound with the following physical properties:
1. ** Physical state and odor **: At room temperature and pressure, 3-methyl-1-pentyne is a colorless liquid and emits a special odor. This odor is unique and highly recognizable in organic compounds. However, it is irritating to a certain extent, and excessive inhalation is harmful to the human body.
2. ** Boiling point and melting point **: The boiling point is about 56 ° C, and the melting point is about -106 ° C. A relatively low boiling point indicates that it is volatile at room temperature. When storing, it should be sealed to prevent volatilization loss.
3. ** Density **: The density is less than that of water, about 0.69 g/cm ³. This property makes 3-methyl-1-pentyne float on the water surface when mixed with water. Using this difference, it can be separated from water by a simple liquid separation operation.
4. ** Solubility **: It is difficult to dissolve in water, but it can be miscible with most organic solvents such as ethanol, ether, benzene, etc. Because 3-methyl-1-pentyne is a non-polar molecule, it is more soluble in non-polar or weakly polar organic solvents according to the principle of "similar miscibility".
5. ** Volatility **: Volatility is strong, because of its low boiling point, it is easy to change from liquid to gaseous at room temperature and escape. This not only requires good sealing during storage, but also pay attention to operating in a well-ventilated environment during use to avoid its accumulation in the air.
6. ** Refractive index **: The refractive index is about 1.388 (20 ° C). As one of the characteristic constants of the substance, the refractive index can be used to identify the purity of 3-methyl-1-pentyne. The refractive index of the substance with different purity will vary slightly.

3-Methyl-1-pentyne alcohol is an organic compound. Its molecule contains alkynyl groups and alcohol hydroxyl groups, and this structure gives it unique chemical properties.
First talk about its alkynyl properties. The triple bond has high reactivity and can undergo an addition reaction. If under appropriate catalysts and conditions, it can be added with hydrogen. It is first added to an olefin, and if there is enough hydrogen, it will eventually be added to an alkane. Addition with halogen elementals, such as bromine water, will cause the bromine water to fade, and the triple bond will become a double bond or a single bond, depending on the reaction ratio. It can also be added with hydrogen halides. Following the Markov rule, hydrogen atoms are added to the three-bonded carbon atoms containing more hydrogen, and halogens are added to another carbon atom to obtain halogenated olefins or halogenated alkanes.
Alcohol hydroxyl groups also have important chemical properties. Hydroxyl hydrogen has a certain activity and can react with active metals such as sodium to replace hydrogen gas and generate sodium alcohols and hydrogen gas. This is a typical property of alcohols and can be used to detect the presence of hydroxyl groups. Under the condition of concentrated sulfuric acid catalysis and heating, a dehydration reaction will occur. If the temperature is appropriate, the intramolecular dehydration generates olefins, forming carbon-carbon double bonds; if conditions change, intermolecular dehydration can also form ether compounds. In addition, it can be oxidized by oxidants. Under the catalysis of weak oxidants such as copper or silver, it reacts with oxygen to form aldodes or ketones; strong oxidants such as acidic potassium dichromate can be further oxidized to carboxylic acids.
In short, 3-methyl-1-pentyne alcohol exhibits diverse and unique chemical properties due to the coexistence of alkynyl groups and alcohol hydroxyl groups, and is widely used in the field of organic synthesis. It can be used as a raw material to synthesize complex organic compounds.

To prepare 3-methyl-1-butyne, you can follow the following ancient method.
First, the method of eliminating halogenated hydrocarbons. Take a suitable halogenated hydrocarbon, such as 3-methyl-1-halobutane, and use a strong base. In an alcohol solution, the base interacts with the halogenated hydrocarbon, and the halogen atom and the beta-hydrogen atom leave to form an unsaturated bond to obtain 3-methyl-1-butyne. Among them, the halogen atom is preferably bromine and chlorine, and the base can be selected from potassium hydroxide, sodium hydroxide and the like. In the reaction process, the halogen atom first dissociates, and then the alkali grabs the beta-hydrogen, and the electron cloud rearranges to form a carbon-carbon triple bond.
Second, through the reaction of sodium acetylene with halogenated hydrocarbons. First, sodium acetylene is prepared, and acetylene is co-heated with sodium metal to obtain sodium acetylene. Then sodium acetylene is reacted with suitable halogenated hydrocarbons, such as 2-halopropane. The alkynyl negative ions nucleophilically attack the α-carbon of halogenated hydrocarbons, and the halogenated ions leave to form 3-methyl-1-butyne. This reaction requires an anhydrous environment, avoiding the interference of water, in order to preserve the activity of sodium acetylene.
Third, the alkynation reaction of al Start with isobutyraldehyde and add to acetylene negative ions. Acetylene negative ions can be obtained by the interaction of acetylene with strong bases. 3-methyl-1-butyne can also be obtained from the addition product after appropriate treatment, such as dehydration and other steps. Here, it is essential to control the reaction conditions, such as temperature, amount of alkali, etc., in order to promote the reaction in the desired direction and prevent side reactions.
All these methods have their own advantages and disadvantages. In practice, they should be selected according to various factors such as the availability of raw materials, the difficulty of reaction, and the high and low yield.

I look at the prices in the market, which often vary with time, place and quality. It is not easy to determine the price of 3-methyl-1-pentynitrile.
However, the theory of "Tiangong Kaiwu" is tested. The price of everything is related to the raw materials used, the difficulty of production, and the situation of supply and demand. 3-methyl-1-pentynitrile is an essential agent for organic synthesis. It is used in the pharmaceutical and pesticide industries.
If the procurement of its raw materials is difficult and complicated, the cost will be high, and the price will follow. When making, if you need exquisite methods, expensive utensils, or strict environmental conditions, the price is not cheap. In addition, if the supply exceeds the demand, the price will be depressed.
In today's chemical market, the price of this chemical varies depending on the quality grade. For ordinary grades, the price may be several hundred yuan per kilogram; for high-purity and refined products, the price may be as high as 1,000 yuan per kilogram, or even higher. This is due to the difficulty of preparation and the uniqueness of demand.
However, the market conditions change rapidly, and the price fluctuates accordingly. Or due to the abundance of raw materials, or due to the current situation, the transportation is blocked, which can make the price different. Therefore, if you want to know the exact price, you should carefully examine the market conditions and inquire about various merchants before you can obtain a near-real number.