3-Nitrobenzonitrile, is an organic compound with CAS 619-24-9 and molecular formula C7H4N2O2. It is a colorless to light yellow solid. There is a nitro group (NO2) and a nitrile group (CN) in the molecule, both of which affect its chemical properties. The presence of nitro groups gives it significant acidity, while nitrile groups give it a certain degree of nucleophilicity. Under certain specific conditions, it may appear slightly yellow or light brown. The density is usually slightly greater than 1, and the specific values may vary slightly due to changes in temperature and pressure. However, under normal laboratory conditions, its density can be considered as about 1.2 g/cm ³. It can be soluble in most organic solvents, such as acetone, chloroform, and ethyl acetate. However, its solubility in water is relatively low, which makes it less biologically active in water. It is a compound with special chemical properties. It can serve as an important intermediate in organic synthesis, as well as an active ingredient in practical applications such as drugs and pesticides. Due to the presence of multiple reactive functional groups in its molecular structure, it can undergo various chemical reactions. For example, the acidity of nitro groups allows them to react with bases to form salts; Nitrile groups enable them to undergo nucleophilic addition reactions with nucleophilic reagents; In addition, it can also reduce nitro groups to amino groups through a reduction reaction. These chemical properties make the substance widely applicable in organic synthesis.
(Product link: https://www.bloomtechz.com/synthetic-chemical/organic-intermediates/3-nitrobenzonitrile-cas-619-24-9.html)
Method 1: Chlorination diazotization is a commonly used method for synthesizing 3-Nitrobenzoitrile.
Step 1: diazotization reaction
Add concentrated hydrochloric acid and sodium nitrite to a sodium chloride aqueous solution to prepare a nitrite hydrochloric acid solution. This solution reacts with organic compounds (such as benzonitrile) at low temperatures to form diazonium salts. The structure of diazonium salts is determined by the concentration of the nitrite hydrochloric acid solution used and the reaction temperature.
NaNO2+HCl → NaCl+HNO2
NaNO2+2HCl → NaCl+H2N-Cl
Step 2: Coupling reaction
In the reaction solution, organic compounds (such as benzonitrile) that undergo coupling reactions with diazonium salts are added to generate the target compound 3-Nitrobenzone itrile. This reaction is carried out at low temperatures to prevent the decomposition of diazonium salts.
H2N-Cl+PhCN → 3-Nitrobenzoitrile+NaCl+H2O
Notes:
1. The chlorination diazotization method requires strict reaction conditions, which need to be carried out at low temperatures, and the pH value of the reaction solution needs to be controlled during the reaction process. If the pH value is too high, it can lead to the decomposition of diazonium salts, affecting the generation of target compounds.
2. During the reaction process, a large amount of reagents and solvents are required, therefore effective waste treatment and solvent recovery are needed to reduce production costs and environmental pollution.
3. In the synthesis process, corrosive chemical reagents need to be used, therefore corrosion-resistant equipment needs to be used and necessary safety measures need to be taken.
4. After the generation of the target compound, purification and refinement are required to remove impurities and improve product quality. The commonly used purification methods include crystallization, extraction, distillation, etc.
Nitrification reaction is an organic reaction that occurs under acidic conditions such as concentrated sulfuric acid or concentrated nitric acid. During the reaction, the acid reacts with a nitrating agent to nitrate the hydrogen atoms or hydroxide groups in organic molecules into nitro groups. When synthesizing 3-Nitrobenzoitrile, concentrated nitric acid is usually used as a nitrating agent.
The reaction equation between benzonitrile and concentrated nitric acid:
CH3C ≡ N+HNO3 → CH3C (NO2) CN+H2O
The reaction equation between benzonitrile and concentrated sulfuric acid:
CH3C ≡ N+H2SO4 → CH3C (HSO3) CN+H2O
Reaction steps:
1. Prepare raw materials
Firstly, it is necessary to prepare benzonitrile and concentrated nitric acid as raw materials. Benzonitrile can be prepared by reacting benzoyl chloride with ammonia water. Concentrated nitric acid is a strong acid with strong oxidizing and corrosive properties, and requires special care in handling.
2. Mixed raw materials
Mix benzonitrile and concentrated nitric acid in a certain proportion. Normally, the amount of concentrated nitric acid is about 1.5 times that of benzonitrile. When mixing, it is necessary to slowly add concentrated nitric acid to benzonitrile and continuously stir to avoid dangerous situations such as local overheating or explosion.
3. Heating reaction
Heat the mixed solution to a certain temperature (usually between 60-80 ℃) to allow the nitrification reaction to begin. Continuous stirring is required during the heating process to promote the reaction. At the same time, it is necessary to pay attention to temperature control to avoid the occurrence of side reactions caused by excessive temperature.
4. Cooling crystallization
After the reaction is completed, cool the solution to room temperature and allow 3-Nitrobenzoitrile to crystallize and precipitate. During the crystallization process, it is necessary to maintain stirring to avoid crystal clumping or precipitation.
5. Filter separation
Filter and separate the crystallized solution to obtain crude 3-Nitrobenzanitrile crystals. When filtering, equipment such as a Buchner funnel and suction bottle should be used, and attention should be paid to maintaining hygiene and safety during operation.
6. Purification and purification
In order to obtain high-purity 3-Nitrobenzoitrile, it is necessary to purify the crude product. Purification is usually carried out using methods such as recrystallization or column chromatography. Recrystallization is the process of dissolving the crude product in an appropriate solvent, and then precipitating the crystal by evaporating the solvent or adding other solvents. Column chromatography is a method of separation that utilizes the difference in distribution coefficients between fixed and mobile phases of different substances. After purification, high-purity 3-Nitrobenzoitrile can be obtained.
The synthesis of 3-Nitrobenzoitrile using the oxidation method of benzonitrile is a commonly used synthesis method. Oxidation method is a method of oxidizing functional groups in organic compounds by introducing oxidants. Nitric acid is commonly used as an oxidant in the synthesis of 3-Nitrobenzoitrile. Nitric acid is a strong acid with strong oxidizing and corrosive properties, and requires special care in handling.
The reaction equation between benzonitrile and nitric acid:
CH3C ≡ N+HNO3 → CH3C (NO2) CN+H2O
In this reaction, nitric acid acts as an oxidant to oxidize benzonitrile to 3-Nitrobenzoitrile. Simultaneously, water was generated as a byproduct. This reaction is a typical oxidation reaction, and the purity and yield of the product can be improved by controlling the reaction conditions.
Reaction steps
1. Prepare raw materials
Firstly, it is necessary to prepare benzonitrile and nitric acid as raw materials. Benzonitrile can be prepared by reacting benzoyl chloride with ammonia water. Nitric acid is a strong acid with strong oxidizing and corrosive properties, and requires special care in handling.
2. Mixed raw materials
Mix benzonitrile and nitric acid in a certain proportion together. Normally, the amount of nitric acid used is about 1.5 times that of benzonitrile. When mixing, it is necessary to slowly add nitric acid to benzonitrile and continuously stir to avoid dangerous situations such as local overheating or explosion.
3. Heating reaction
Heat the mixed solution to a certain temperature (usually between 60-80 ℃) to allow the oxidation reaction to begin. Continuous stirring is required during the heating process to promote the reaction. At the same time, it is necessary to pay attention to temperature control to avoid the occurrence of side reactions caused by excessive temperature.
4. Cooling crystallization
After the reaction is completed, cool the solution to room temperature and allow 3-Nitrobenzoitrile to crystallize and precipitate. During the crystallization process, it is necessary to maintain stirring to avoid crystal clumping or precipitation.
5. Filter separation
Filter and separate the crystallized solution to obtain crude 3-Nitrobenzanitrile crystals. When filtering, equipment such as a Buchner funnel and suction bottle should be used, and attention should be paid to maintaining hygiene and safety during operation.
6. Purification and purification
In order to obtain high-purity 3-Nitrobenzoitrile, it is necessary to purify the crude product. Purification is usually carried out using methods such as recrystallization or column chromatography. Recrystallization is the process of dissolving the crude product in an appropriate solvent, and then precipitating the crystal by evaporating the solvent or adding other solvents. Column chromatography is a method of separation that utilizes the difference in distribution coefficients between fixed and mobile phases of different substances. After purification, high-purity 3-Nitrobenzoitrile can be obtained.