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

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3,4-Dichloroaniline is an important raw material for chemical production, which is widely used in medicine, pesticides, dyes and other fields. This paper will introduce the properties and uses of 3,4-dichloroaniline in detail.

1. properties

1. Physical properties

3,4-dichloroaniline is white to light yellow crystalline powder, melting point is 82-85 ℃, boiling point is 265 ℃, insoluble in water, soluble in ethanol, ether, acetone and other organic solvents.

2. chemical properties

3,4-dichloroaniline has strong reactivity and can carry out a series of chemical reactions, such as substitution reaction, condensation reaction, oxidation reaction and so on. Among them, the substitution reaction is the most common type of reaction, which can be substituted with acids, bases, halogens, etc. to generate corresponding derivatives.

2. uses

1. pharmaceutical intermediates

3,4-dichloroaniline is an important pharmaceutical intermediates, can be used for the synthesis of antibacterial drugs, anticancer drugs, anti-tuberculosis drugs and other drugs. For example, 3,4-dichloroaniline can be used to synthesize nitrogen mustard, a drug for the treatment of tumors, and isoniazid, a drug for the treatment of tuberculosis.

2. Pesticide intermediates

3,4-dichloroaniline can also be used to synthesize pesticide intermediates, such as pesticides, fungicides, etc. For example, 3,4-dichloroaniline can be used to synthesize the broad-spectrum fungicide prochloraz, and the insecticide fipronil.

3. Dye intermediate

3,4-dichloroaniline can also be used to synthesize dye intermediates, such as acid dyes, direct dyes, etc. These dyes are widely used in textile, printing and dyeing, papermaking and other industries.

In conclusion, 3,4-dichloroaniline, as an important raw material for the production of chemicals, is widely used in medicine, pesticides, dyes and other fields, and has high economic value. In the process of use, it is necessary to pay attention to its toxicity and safety to avoid harm to the environment and human body.

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