N-Methylaniline CAS 100-61-8

N-Methylaniline is an aniline derivative. It is an organic compound with the chemical formula C6H5NH(CH3). The substance exists as a colorless or slightly yellow viscous liquid and turns brown when exposed to air. Slightly soluble in water but soluble in ethanol, ether, and chloroform. It is used as a latent and coupling solvent and is also used as an intermediate for dyes, agrochemicals and other organic products manufacturing. It is a principal component of MMA (monomethylaniline), an antiknock agent, used to increase the octane number, more effective than Methyl tert-butyl ether. Usually added to gasoline in concentrations around 1.3% mass.

The production of N-Methylaniline involves several methods, each with its unique characteristics and applications. One traditional approach involves the alkylation of aniline with methanol using sulfuric acid as a catalyst under pressure. However, this method is less favorable due to its low selectivity, low yield, significant waste pollution, and equipment corrosion issues.

A more commonly used method today involves the reaction of aniline and methanol in the presence of a copper-zinc-chromium catalyst. This process produces a crude product, which is then purified through distillation. The resulting typically has a high purity, with low levels of unreacted aniline and N,N-dimethylaniline.

Another method involves the use of a trichlorophosphine catalyst. In this process, aniline and methanol react at high temperatures to produce it. However, the selectivity and yield of this method are lower compared to the copper-zinc-chromium catalyst method.

In addition to these methods, there are also alternative approaches such as the hydrogenation reduction of nitrobenzene using hydrogen in the presence of a catalyst, which is currently a mainstream production process. This method converts nitrobenzene into N-methylaniline efficiently.

Regardless of the chosen method, it is crucial to carefully control the reaction conditions, including temperature, pressure, and the selection and dosage of catalysts. This ensures the efficiency and selectivity of the reactions. Moreover, safety measures must be strictly adhered to during the production process to prevent explosions, toxic exposures, and fires, thereby safeguarding personnel and equipment.

Overall, the production involves various methods, each with its advantages and disadvantages. The choice of the production method depends on factors such as production requirements, economic efficiency, and environmental considerations.

Chemical Synthesis and Organic Intermediates

N-Methylaniline serves as an important intermediate in organic synthesis. It can be used to produce various organic compounds, including dyes and pesticides. Its reactivity allows it to participate in numerous chemical reactions, making it a crucial building block in the synthesis of complex molecules.

Dye Industry

In the dye industry, it plays a significant role. It is used in the production of various dyes, such as cationic bright reds, cationic pinks, and reactive yellows. These dyes find applications in the textile, printing, and other related industries, where they are used to color fabrics, papers, and other materials.

Pesticide Production

It is also used in the production of pesticides. It can be used to synthesize insecticides and herbicides that are effective in controlling pests and weeds. These pesticides are crucial in protecting crops and maintaining agricultural productivity.

Solvent and Acid Absorbent

Due to its solubility properties, it can be used as a solvent in various chemical reactions and processes. It can also act as an acid absorbent, helping to neutralize acidic substances in industrial applications.

Polymer Industry

It can also be used in polymer synthesis. It can react with other compounds to form polymers with specific functional properties. These polymers find applications in areas such as coatings, plastics, and adhesives, where they improve the stability and durability of the final products.

Pharmaceutical Applications

In the pharmaceutical industry, it can be used as an intermediate in the synthesis of certain drugs. It plays a role in the production of medications that are used to treat various conditions and diseases. However, its use in pharmaceuticals requires strict control and safety measures to ensure the safety and effectiveness of the final drugs.

Photovoltaic and Electronic Applications

Due to its electrical properties, it also finds applications in the photovoltaic and electronic industries. It can be used in the fabrication of organic solar cells and other electronic devices, where it acts as an electron transport material, promoting the conversion and storage of photovoltaic energy.

 

In summary, N-Methylaniline is a highly versatile compound with a wide range of applications. Its uses span from chemical synthesis and dye production to pesticide manufacturing and pharmaceutical synthesis. With its diverse reactivity and solubility properties, it continues to play a crucial role in various industries worldwide.

The discovery of N-methylaniline cannot be separated from the study of its parent compound, aniline (C ₆ H ₅ NH ₂). Aniline was first obtained by German chemist Otto Unverdorben in 1826 through dry distillation of indigo, and he named it "Krystalin". In 1834, Friedrich Runge isolated aniline from coal tar and observed its reaction with chlorine gas to produce a blue substance (which later became the basis for aniline dyes). In 1840, Yuly Fritzsche obtained aniline by alkaline treatment of indigo and officially named it "Aniline", derived from the Portuguese word "anil" (indigo). The discovery of aniline promoted the development of organic amine chemistry, and scientists began to study its derivatives, including methylation products. The synthesis of N-methylaniline was achieved in this context.
The synthesis of N-methylaniline can be traced back to the mid-19th century, when chemists began exploring the alkylation reaction of aniline. In 1850, French chemists Auguste Cahours and Adolphe Wurtz first reported a method for preparing N-methylaniline by reacting aniline with methanol or iodomethane. They found that aniline can react with methylation reagents (such as CH3 I) under alkaline conditions to produce monomethylated products (N-methylaniline) and dimethylated products (N, N-dimethylaniline).

The reaction equation is as follows:

C6​H5​NH2​+CH3​I→C6​H5​NHCH3​+HI

This discovery marks the formal confirmation of N-methylaniline as a new organic amine. Subsequently, German chemists Hermann Kolbe and Edward Frankland further studied the mechanism of alkylation reactions, laying the foundation for organic synthesis chemistry.In the second half of the 19th century, with the development of organic structure theory, the molecular structure of NMA gradually became clear. In 1865, Friedrich Kekul é proposed the theory of benzene ring structure, which made the structure of aniline and its derivatives clearer. NMA has been confirmed as a product in which one hydrogen in aniline is replaced by a methyl group (- CH3). In the 1870s, chemists began studying the physical and chemical properties of NMA, including:

• Alkaline: NMA is slightly more alkaline than aniline because the electron donating effect of methyl enhances the electron density of nitrogen atoms.
• Oxidation reaction: NMA can be oxidized to nitroso or nitro compounds.
• Reaction with acid: can form stable salts, such as N-methylaniline hydrochloride (C ₆ H ₅ NHCH ∝· HCl).

These studies provide a theoretical basis for the industrial application of NMA.

With the booming development of the dye industry, the demand for N-methylaniline has rapidly increased. German chemical companies such as BASF and Hoechst have developed efficient industrial production methods, mainly including:

• Methylation of aniline: Under high temperature and pressure, aniline reacts with methanol or dimethyl sulfate to form N-methylaniline.

C6​H5​NH2​+CH3​OHH2​SO4​​C6​H5​NHCH3​+H2​O

• Reduction methylation: Aniline reacts with formaldehyde and hydrogen gas under the action of a catalyst (such as Ni or Cu) to produce N-methylaniline.

These methods make large-scale production of N-methylaniline possible and promote its application in dye synthesis

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