4-Bromobenzotrifluoride is a transparent to brown liquid with a slight special odor. Molecular formula C7H4BrF3, CAS402-43-7. Not easily volatile at room temperature and pressure. Easy to dissolve in water and concentrated potassium sulfate solution, almost insoluble in ethanol. It is relatively stable at room temperature and pressure, and is not prone to chemical reactions. It has a certain degree of sublimation and can sublimate when heated. Has high crystallinity and is easy to form crystals. It is an important intermediate in organic synthesis and can be used to synthesize other organic compounds. By reacting with different reactants, a series of compounds with specific structures and properties can be synthesized, which are used in fields such as medicine, pesticides, dyes, etc. There are various uses in oilfield chemicals, involving the synthesis of oilfield additives, oil recovery agents, oil-water treatment agents, oilfield equipment preservatives, and drilling fluid additives. These chemicals play an important role in oilfield extraction and the petroleum industry, helping to improve extraction efficiency, reduce costs, protect equipment and the environment, and so on.
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The sulfonation amination method is a commonly used method for synthesizing 4-Bromobenzotrifluoride. The following are the detailed steps and corresponding chemical equations:
1. Bromination reaction
The bromination reaction is a crucial step in the conversion of 4-iodobenzene to 4-bromobenzene. This step is usually carried out under the catalysis of anhydrous aluminum chloride or iron powder. 4-iodobenzene (C6H5I) reacts with bromine (Br2) to produce 4-bromobenzene (C6H4Br).
Chemical equation: C6H5I+Br2 → C6H4Br+HBr
2. Sulfonation reaction
Under the action of concentrated sulfuric acid, 4-bromobenzene reacts with hydrogen ions in the mixed acid to produce 4-nitrobromobenzene (C6H4BrNO2).
Chemical equation: C6H4Br+HNO3+H2SO4 → C6H4BrNO2+H2O
3. Reduction reaction
Under the action of reducing agents such as iron powder, hydrazine hydrate, sodium sulfide, etc., 4-nitrobromobenzene is reduced to 4-aminobromobenzene (C6H4BrNH2).
Chemical equation: C6H4BrNO2+reducing agent → C6H4BrNH2+product
4. Diazotization reaction
Under the action of sodium nitrite (NaNO2), 4-aminobromobenzene forms diazonium salts.
Chemical equation: C6H4BrNH2+NaNO2 → diazonium salt+NaBr
5. Fluorination reaction
Diazo salt reacts with hydrogen fluoride (HF) to produce 4-fluorobenzenesulfonic acid (C6H3FSO3H).
Chemical equation: diazonium salt+HF → C6H3FSO3H+N2
6. Amination reaction
Under the action of ammonia (NH3), 4-fluorobenzenesulfonic acid is converted to 4-aminobenzenesulfonamide (C6H5SO2NHNH2). This step can also replace ammonia with other amine substances, such as methylamine, ethylamine, etc.
Chemical equation: C6H3FSO3H+NH3 → C6H5SO2NHNH2+H2O
7. Rearrangement reaction
Under heating conditions, 4-aminobenzenesulfonamide undergoes a rearrangement reaction to produce the target product 4-Bromobenzotrifluoride (C6H3BrF3). This reaction is also known as Fischer Tropsch rearrangement.
Chemical equation: C6H5SO2NHNH2 → C6H3BrF3+H2SO3
Through the above seven steps, 4-Bromobenzotrifluoride can be successfully synthesized through sulfonation amination method. The entire process involves various types of chemical reactions, including halogenation, sulfonation, reduction, diazotization, fluorination, and rearrangement. The combination and sequence of these reactions work together to ultimately achieve the synthesis of the target product. In practical operation, it is necessary to strictly control the reaction conditions, such as temperature, acidity, time, etc., to ensure the purity and yield of the product. Meanwhile, for certain hazardous chemicals and operations, corresponding safety measures need to be taken to ensure the safety of experimental personnel.
Bromination is a commonly used method for synthesizing 4-Bromobenzotrifluoride. The following are the detailed steps and corresponding chemical equations:
1, Bromination reaction
The bromination reaction is a crucial step in the conversion of 4-iodobenzene to 4-bromobenzene. This step is usually carried out under the catalysis of anhydrous aluminum chloride or iron powder. 4-iodobenzene (C6H5I) reacts with bromine (Br2) to produce 4-bromobenzene (C6H4Br).
Chemical equation: C6H5I+Br2 → C6H4Br+HBr
2, Fluorination reaction
Under the action of hydrogen fluoride, 4-bromobenzene is converted to 4-fluorobenzene.
Chemical equation: C6H4Br+HF → C6H4F+HBr
3, Sulfonation reaction
Under the action of concentrated sulfuric acid, 4-fluorobenzene reacts with hydrogen ions in the mixed acid to produce 4-fluorobenzenesulfonic acid.
Chemical equation: C6H4F+HNO3+H2SO4 → C6H4FSO3H+H2O
4, Nitrification reaction
Under the action of concentrated nitric acid, 4-fluorobenzenesulfonic acid is converted to 4-nitrofluorobenzenesulfonic acid.
Chemical equation: C6H4FSO3H+HNO3 → C6H4FSO2NO2+H2O
5, Hydrolysis reaction
Under the action of sodium hydroxide, 4-nitrofluorobenzenesulfonic acid is hydrolyzed to produce 4-nitroaniline.
Chemical equation: C6H4FSO2NO2+2NaOH → C6H4NH2SO3Na+NaNO2+NaF+2H2O
6, Diazotization reaction
Under the action of sodium nitrite, 4-nitroaniline is converted into diazonium salts.
Chemical equation: C6H4NH2SO3Na+NaNO2 → C6H4NSO2Na+N2
7, Reduction reaction
Under the action of hydrogen, diazonium salts are reduced to corresponding amino salts.
Chemical equation: C6H4NSO2Na+3H2 → C6H4NH3+NaHS+3H2O
8, Salinization reaction
Amino salts react with acids to produce the target product. Due to the fact that amino groups are alkaline groups, they undergo neutralization reactions with acids, producing corresponding salts and water. In this process, some subsequent treatments such as decolorization and desalination are needed to ensure the purity and quality of the product.
Chemical equation: C6H4NH3+HX → C6H3 (X) NH2+H2O, where X represents acid ions.