4-Bromo-3-nitrotoluene CAS 5326-34-1

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4-Bromo-3-nitrotoluene, molecular formula C8H7BrNO2, CAS 5326-34-1, corresponding molecular weight 230.05 g/mol. It is a white to light yellow solid powder. It is soluble in some organic solvents such as alcohols and ketones at room temperature, but its solubility in water is relatively low. It is a relatively stable compound that is not easily decomposed or exploded. But it is an organic halogenated hydrocarbon that should be avoided from contact with strong oxidants and high temperature conditions. It is a toxic compound that may cause harm to humans and animals. Therefore, attention should be paid to safety and follow the correct experimental operation methods when handling and using. It is an important intermediate in the pesticide and pharmaceutical industries. It can be used to synthesize various drugs and pesticides, such as insecticides, fungicides, and herbicides. These drugs and pesticides can be used to control crop diseases and pests, increase crop yields, and prevent and treat diseases in humans and animals. It can also be used for synthesizing surfactants, extractants, fragrances, and optical materials. It can also be used as a raw material to produce other compounds, such as alcohols, aldehydes, ketones, and carboxylic acids.

4-Bromo-3-nitrotoluene has a wide range of applications in the synthesis of flame retardants. As an important organic synthesis intermediate, it can be used to synthesize various compounds with excellent flame retardancy.

1. Synthetic brominated flame retardants: 4-Bromo 3-nitrotoluene can be used to synthesize various brominated flame retardants. These brominated flame retardants typically have high thermal stability, low smoke release, and good electrical insulation properties. They can be used for flame retardant treatment of various polymer materials, such as polyester, polyimide, epoxy resin, and polyurethane.

2. Mixing with other flame retardants: 4-Bromo 3-nitrotoluene can be mixed with other flame retardants to improve synergistic effects and reduce costs. These flame retardants can include phosphorus based flame retardants, inorganic flame retardants, and nitrogen based flame retardants. By compounding, a mixed flame retardant with excellent flame retardancy can be obtained, which can be used for flame retardant treatment of various materials.

 

3. Synthetic intumescent flame retardant: 4-Bromo 3-nitrotoluene can be used to synthesize intumescent flame retardants. This type of flame retardant will decompose to produce gas at high temperatures, which helps to expand the material and form a dense carbon layer, thereby reducing flammability and improving fire resistance limit. They are suitable for flame retardant treatment of polymer materials, such as polyurethane, epoxy resin, and polyimide.

4. Modified other flame retardants: 4-Bromo 3-nitrotoluene can be used to modify other flame retardants to improve their performance and applicability. For example, it can be used as a reactant or crosslinking agent to modify organic or inorganic flame retardants to improve their thermal stability, flame retardancy, and electrical properties.

5. Synthetic smoke suppressants: 4-Bromo 3-nitrotoluene can be used to synthesize smoke suppressants, reducing the smoke release of materials during combustion. These smoke suppressants are usually used in combination with flame retardants to improve flame retardancy and reduce negative environmental impacts.

It should be noted that when synthesizing flame retardants using 4-Bromo 3-nitrotoluene, attention should be paid to factors such as its dosage and reaction conditions. At the same time, it is necessary to comply with relevant regulations and standards to ensure that the synthesized flame retardant meets safety and environmental requirements. In addition, in order to achieve better flame retardancy, it is necessary to adjust and optimize the material formula and processing technology.

4-Bromo-3-nitrotoluene is an organic compound containing bromine and nitroso, which has broad application prospects. It can be used as an intermediate to participate in synthesis in various fields such as pharmaceuticals, dyes, pesticides, and materials science.

Method 1: Chemical reaction:

Nitration reaction of 2-bromo-1-methylstyrene

Chemical equation:

C₇H₈ → C₄H₄BrNO₂ → C₈H₈

C₈H₈ + HNO₃ + H₂SO₄ → 4-bromo-3-nitrostyrene

4-Bromo-3-nitrostyrene → Reduction reaction → C₇H₆BrNO₂

Step:

1) Add styrene, ferric chloride, and carbon tetrachloride to the reaction flask and stir evenly.

2) Gradually add N-bromosuccinimide (NBS) as a bromination reagent.

3) Under cooling conditions, slowly add concentrated nitric acid and concentrated sulfuric acid to the reaction system.

4) The reaction mixture was heated under equal pressure for 20 hours.

5) Use hydrogen gas and Pd/C catalyst for reduction reaction.

2. Coupling reaction of p-nitrochlorobenzene and p-bromotoluene

Chemical equation:

C₆H₄ClNO₂ + C₇H₇Br → 4-Amino-3-bromo-5-nitrobenzaldehyde

4-Amino-3-bromo-5-nitrobenzaldehyde → Selective reduction → C₇H₆BrNO₂

Step:

1) Place p-nitrochlorobenzene and p-bromotoluene in a reaction flask.

2) Add Pd (dppf) Cl2 as a palladium catalyst, add an appropriate amount of NaOAc as a base, and DMF as a solvent.

3) React in an oxygen atmosphere.

4) After the reaction, perform selective reduction treatment.

Method 2 is ultrasonic assisted synthesis of 4-Bromo-3-nitrotoluene, with the following chemical reaction steps:

Chemical equation:

C₈H₈ + C₄H₄BrNO₂ → 2-bromo-1-methylstyrene

2-Bromo-1-methylstyrene + HNO₃ + H₂SO₄ → 4-Bromo-3-nitrostyrene

4-Bromo-3-nitrostyrene → C₇H₆BrNO₂

Step:

1) Add styrene and N-bromosuccinimide (NBS) to the reaction system.

2) Add the solvent dichloromethane and an appropriate amount of activator aluminane.

3) Perform ultrasonic treatment at room temperature, with reaction times ranging from a few minutes to several hours.

4) Add a mixture of concentrated nitric acid and concentrated sulfuric acid, and the reaction system continues to oscillate at room temperature.

5) After the reaction is completed, the process flow (such as extraction, crystallization, etc.) is carried out to obtain the target product.

Ultrasonic assisted reaction utilizes the mechanical vibration of ultrasound to accelerate the collision between molecules in the reaction system, improve the reaction activity of the reactants, shorten the reaction time, and improve the yield and selectivity. When the activator aluminane is added, the chemical reduction ability of aluminum can reduce the energy threshold of the intermediate 4-bromo-3-nitrostyrene, promoting its reaction with nitrate and sulfate ions.

Benzene ring chemistry is an important branch of organic chemistry, and its development laid a solid foundation for the discovery of 4-bromo-3-nitrotoluene. In the early 19th century, the European coal industry flourished and gas lighting was widely used. People found that some oily liquids often remained in gas cylinders. British chemist Faraday developed a strong interest in these liquids and, after five years of research, reported to the Royal Society of London on June 16, 1825, extracting a new compound from them that he called the "heavy carbon compound of hydrogen", which was the prototype of benzene. In 1834, German scientist Michaeli obtained the same substance as Faraday's liquid by distilling a mixture of benzoic acid and lime, and named it "benzene". The determination of the benzene ring structure has gone through a long and tortuous process. German chemist Friedrich Kekuler conducted in-depth research on the chemical properties of carbon and found that carbon has four valence bonds that can be connected to other four atoms or atomic groups to form stable structures. In 1865, Kekule was inspired in a dream and realized that carbon atoms could be connected together in the form of a hexagonal ring, forming a stable benzene ring structure. This discovery is known as the "benzene ring" and has become the fundamental structural unit of many organic compounds. In 1935, Jens used X-ray diffraction to prove that the benzene ring is a planar regular hexagon, with hydrogen atoms located at the vertices of the hexagon, and measured that all carbon carbon bonds in the benzene molecule are identical, which is a special covalent bond between single and double bonds. In 1988, the scientific team of IBM in the United States first captured a single circular image of benzene using a scanning tunneling microscope. In 2009, they also used an atomic force microscope to photograph a single pentacene molecule, thus truly unveiling the mysterious veil of the benzene ring. The particularity of the benzene ring structure endows it with rich chemical properties. In substitution reactions, other functional groups can replace hydrogen atoms on the benzene ring, such as halogenation, nitration, and sulfonation reactions. In terms of addition reactions, although benzene molecules do not have carbon carbon double bonds, they can undergo addition reactions with hydrogen or other substances under specific conditions to generate corresponding compounds, such as cyclohexane. However, this addition reaction is relatively difficult to carry out. In the oxidation reaction, benzene can be completely burned in the air to produce carbon dioxide and water, accompanied by thick smoke, but it cannot cause the acidic potassium permanganate solution to fade. Cracking at high temperatures is also a form of oxidation. The development of benzene ring chemistry provides important theoretical basis and experimental methods for subsequent research on benzene ring derivatives, including 4-bromo-3-nitrotoluene.

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