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[Chemical Knowledge]：Properties and Uses of 3,4-Dichloronitrobenzene

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3,4-Dichloronitrobenzene is an important raw material for chemical production and has a wide range of uses. The following is a detailed description of the properties and uses of 3,4-dichloronitrobenzene.

1. properties

1. Physical properties
3,4-dichloronitrobenzene is a colorless or slightly yellow crystalline solid with a strong pungent odor. It has a high melting point, generally between 52-55 ℃, a boiling point of 242 ℃, and a density of 1.46g/cm³. 3,4-dichloronitrobenzene is insoluble in water, but soluble in many organic solvents, such as ethanol, ether, acetone, etc.

2. Chemical properties
3,4-dichloronitrobenzene has certain stability, but it is easy to decompose and react under high temperature, light and acidic conditions. It has strong reducibility and can be oxidized by oxidants to the corresponding aniline compounds. In addition, 3,4-dichloronitrobenzene can also undergo substitution reactions, addition reactions, etc. with many compounds.

2. Use

1. Pesticide Production
3,4-Dichloronitrobenzene is an important pesticide intermediate that can be used to produce a variety of pesticides. For example, it can react with phenol to make dichlorophenol, and then condense with formaldehyde to make dichlorophenol formaldehyde resin, which is a broad-spectrum fungicide that can be used to control crop diseases.

2. Dye production
3,4-dichloronitrobenzene can be used to produce a variety of dyes, such as acid dyes, direct dyes, disperse dyes, etc. By reacting with different compounds, dyes of various colors and properties can be obtained.

3. pharmaceutical intermediates
3,4-dichloronitrobenzene can also be used to produce a variety of pharmaceutical intermediates, such as anticancer drugs, antibacterial drugs. Through further reaction and processing, these compounds can be made into various clinical drugs for the treatment of various diseases.

In conclusion, 3,4-dichloronitrobenzene, as an important raw material for chemical production, has a wide range of uses in the fields of pesticides, dyes, pharmaceuticals and so on.

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