Question

Fluorobenzene $\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{F}\right)$ can be synthesized in the laboratory by?

Answer 1

Fluorobenzene synthesis in the laboratory:

• Fluorobenzene $\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{F}\right)$ can be synthesized in the laboratory from Aniline$\left({\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{NH}}_2\right)$ by diazotization followed by heating the Diazonium salt along with${\mathrm{HBF}}_4$.
• In this reaction, a primary aromatic amine is transformed into an aryl fluoride using Diazonium tetrafluoroborate as an intermediate.
• The steps involved in the chemical reaction are as follows,

Step 1 - Formation of Diazonium salt:

In the first step, Aniline undergoes diazotization to form Diazonium salt along with${\mathrm{HBF}}_4$.

(Aniline) (Diazonium salt)

Step 2 - Formation of Fluorobenzene $\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{F}\right)$:

In the next step, Diazonium salt undergoes heating to form Fluorobenzene $\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{F}\right)$ as the product.

(Diazonium tetrafluoroborate) (Fluorobenzene)

• This synthesis process is called the Schiemann reaction OR Balz Schiemann reaction.

Hence, Fluorobenzene $\left({\mathrm{C}}_6{\mathrm{H}}_5\mathrm{F}\right)$ can be synthesized in the laboratory by diazotization of Aniline followed by heating the diazonium salt along with${\mathrm{HBF}}_4$.