Show how each of the following compounds can be synthesized from benzene:
h. m-bromopropylbenzene

Verified step by step guidance

Step 1: Begin with benzene as the starting material. Benzene is a simple aromatic compound with the formula \( C_6H_6 \).

Step 2: Perform a Friedel-Crafts alkylation to introduce a propyl group onto the benzene ring. Use propyl chloride (\( CH_3CH_2CH_2Cl \)) as the alkylating agent and aluminum chloride (\( AlCl_3 \)) as the Lewis acid catalyst. This will yield propylbenzene.

Step 3: Brominate the propylbenzene to introduce a bromine atom at the meta position relative to the propyl group. Use bromine (\( Br_2 \)) in the presence of a Lewis acid catalyst such as ferric bromide (\( FeBr_3 \)). The propyl group is an electron-donating group, which directs the bromination to the meta position.

Step 4: Verify the structure of the product, m-bromopropylbenzene, to ensure that the bromine atom is located at the meta position relative to the propyl group on the benzene ring.

Step 5: Purify the product using appropriate techniques such as recrystallization or column chromatography to isolate m-bromopropylbenzene in its pure form.

Verified video answer for a similar problem:

This video solution was recommended by our tutors as helpful for the problem above.

Video duration:

Was this helpful?

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Electrophilic Aromatic Substitution

Electrophilic aromatic substitution (EAS) is a fundamental reaction in organic chemistry where an electrophile replaces a hydrogen atom on an aromatic ring. This process is crucial for synthesizing various aromatic compounds, including m-bromopropylbenzene from benzene. Understanding the mechanism of EAS, including the role of catalysts and the stability of intermediates, is essential for predicting the outcomes of such reactions.

Bromination of Aromatic Compounds

Bromination is a specific type of electrophilic aromatic substitution where bromine is introduced into an aromatic compound. This reaction typically requires a brominating agent, such as Br2, and a Lewis acid catalyst like FeBr3. Recognizing how to control the regioselectivity of bromination is vital, especially for directing the bromine to the meta position in m-bromopropylbenzene.

Alkylation of Aromatic Compounds

Alkylation involves the introduction of an alkyl group into an aromatic ring, often through Friedel-Crafts alkylation. This reaction typically uses an alkyl halide and a strong Lewis acid catalyst. Understanding the reactivity of different alkyl groups and the potential for rearrangements is important for successfully synthesizing compounds like m-bromopropylbenzene from benzene.

Recommended video:

Guided course