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[Chemical Knowledge]：Properties and Uses of p-Methylbenzoic Acid

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P-toluic acid is an important organic chemical raw material, which is widely used in medicine, pesticides, dyes, spices and other fields. In this paper, the properties, uses and production processes of p-toluic acid will be introduced in detail.

1. the nature of p-toluic acid

p-toluic acid (p-toluic acid) is a white crystalline powder with a molecular formula of C8H8O2 and a molecular weight of 136.15. It has a strong pungent odor, soluble in hot water, ethanol, ether and other organic solvents, slightly soluble in cold water. p-toluic acid has a melting point of 121-123°C, a boiling point of 249°C and a density of 1.266g/cm3. p-toluic acid is acidic and can react with bases to form the corresponding salts. In addition, it also has some special chemical properties, such as Friedel's reaction, esterification reaction and so on.

2. of the use of methyl benzoic acid

1. pharmaceutical field

of methyl benzoic acid in the field of medicine has a wide range of applications, is an important synthetic raw material for many drugs. For example, it can be used to synthesize antibacterial drugs, anti-inflammatory drugs, anti-tumor drugs, etc.

2.

in the field of pesticides In the field of pesticides, p-toluic acid is also an important raw material that can be used to synthesize pesticides, fungicides and other pesticides.

3.

in the field of dyes p-toluic acid can be used to synthesize various dyes, such as acid dyes, direct dyes, disperse dyes, etc.

4.

in the field of spices In the field of spices, p-toluic acid can be used as a blending ingredient for the production of various spices.

3. of the production process of methyl benzoic acid

of the production process of methyl benzoic acid mainly has the following:

1. by the methyl toluene oxidation method to produce

of methyl toluene mixed with air, in the presence of a catalyst oxidation reaction, the generation of methyl benzoic acid. The method is simple and easy to operate, but the yield is low.

2. by the p-tolualdehyde oxidation of

will be p-tolualdehyde and oxidant (such as nitric acid, potassium permanganate, etc.) reaction, generation of p-toluic acid. The yield of this method is high, but the operation process is more complicated.

3. by the carboxylation of methyl phenol to produce

will be methyl phenol and dimethyl carbonate reaction, generation of methyl benzoic acid. The method has high yield and mild reaction conditions.

The above is a brief introduction to the nature, use and production process of p-toluic acid.

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