The preparation of haloarenes from diazonium salts involves the Sandmeyer reaction. Here are the steps:

1. Diazotization: The first step is the preparation of diazonium salt from aniline. Aniline is treated with nitrous acid (prepared from sodium nitrite and hydrochloric acid) at 0-5°C to form a diazonium salt.

2. Sandmeyer Reaction: The diazonium salt is then treated with copper powder and a halogen (Cl, Br, or I) in the presence of hydrochloric acid. This results in the formation of a haloarene.

Here is the general reaction:

ArNH2 + NaNO2 + HCl → ArN2+Cl- (Diazonium salt)
ArN2+Cl- + Cu + X2 → ArX + N2 + CuX (X = Cl, Br, I)

In this reaction, Ar represents an aryl group, X represents a halogen, and N2 represents nitrogen gas. The nitrogen gas is released as a byproduct.

This method is commonly used for the preparation of chlorobenzene and bromobenzene. It's important to note that this reaction must be carried out at a low temperature to prevent the decomposition of the diazonium salt.

Question

The preparation of haloarenes from diazonium salts involves the Sandmeyer reaction. Here are the steps:

1. Diazotization: The first step is the preparation of diazonium salt from aniline. Aniline is treated with nitrous acid (prepared from sodium nitrite and hydrochloric acid) at 0-5°C to form a diazonium salt.

2. Sandmeyer Reaction: The diazonium salt is then treated with copper powder and a halogen (Cl, Br, or I) in the presence of hydrochloric acid. This results in the formation of a haloarene.

Here is the general reaction:

ArNH2 + NaNO2 + HCl → ArN2+Cl- (Diazonium salt)
ArN2+Cl- + Cu + X2 → ArX + N2 + CuX (X = Cl, Br, I)

In this reaction, Ar represents an aryl group, X represents a halogen, and N2 represents nitrogen gas. The nitrogen gas is released as a byproduct.

This method is commonly used for the preparation of chlorobenzene and bromobenzene. It's important to note that this reaction must be carried out at a low temperature to prevent the decomposition of the diazonium salt.

Knowee AI · Accepted Answer

The preparation of haloarenes from diazonium salts involves the Sandmeyer reaction. Here are the steps:

1. Diazotization: The first step is the preparation of diazonium salt from aniline. Aniline is treated with nitrous acid (prepared from sodium nitrite and hydrochloric acid) at 0-5°C to form a diazonium salt.

2. Sandmeyer Reaction: The diazonium salt is then treated with copper powder and a halogen (Cl, Br, or I) in the presence of hydrochloric acid. This results in the formation of a haloarene.

Here is the general reaction:

ArNH2 + NaNO2 + HCl → ArN2+Cl- (Diazonium salt)
ArN2+Cl- + Cu + X2 → ArX + N2 + CuX (X = Cl, Br, I)

In this reaction, Ar represents an aryl group, X represents a halogen, and N2 represents nitrogen gas. The nitrogen gas is released as a byproduct.

This method is commonly used for the preparation of chlorobenzene and bromobenzene. It's important to note that this reaction must be carried out at a low temperature to prevent the decomposition of the diazonium salt.

Describe a method for the preparation of haloarenes from diazonium salts.

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