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Chapter 10: Problem 3

What are the four main reactants in the Gabriel synthesis of an amino acid?

Short Answer

Expert verified
The four main reactants are phthalimide, an alkyl halide, potassium hydroxide, and water with an acid or base for hydrolysis.

Step by step solution

01

- Identify the Starting Compound

The Gabriel synthesis begins with phthalimide, which acts as the starting compound for the reaction.
02

- Choose the Alkyl Halide

The second reactant in the Gabriel synthesis is an alkyl halide, which reacts with phthalimide to form an N-alkylphthalimide.
03

- Determine the Base for Deprotonation

A strong base such as potassium hydroxide (KOH) is used to deprotonate phthalimide, making it nucleophilic and ready to react with the alkyl halide.
04

- Identify the Hydrolyzing Agent

Finally, an acidic or basic hydrolysis is performed using water and an acid (e.g., HCl) or a base to cleave the N-alkylphthalimide, yielding the amino acid.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Phthalimide
Phthalimide is a key starting material in Gabriel synthesis. Its structure consists of an imide group bonded to two benzene rings. This unique structure allows it to participate in nucleophilic reactions, which is essential for the Gabriel synthesis.

In the first step, phthalimide reacts with a strong base like potassium hydroxide (KOH). This reaction deprotonates the phthalimide, transforming it into a nucleophilic phthalimide anion. This anion can then participate in further reactions, specifically with an alkyl halide, moving one step closer to synthesizing an amino acid.
Alkyl Halide
An alkyl halide is the second reactant needed in the Gabriel synthesis. Alkyl halides are organic compounds containing a halogen atom (such as chlorine, bromine, or iodine) bonded to an alkyl group. This halogen atom makes alkyl halides highly reactive in nucleophilic substitution reactions.

When the nucleophilic phthalimide anion reacts with the alkyl halide, it results in the formation of N-alkylphthalimide. This step effectively introduces an alkyl group into the phthalimide, progressing the overall synthesis towards producing an amino acid.
Potassium Hydroxide
Potassium hydroxide (KOH) is a strong base used to deprotonate phthalimide in the Gabriel synthesis. Deprotonation is a critical step as it generates the phthalimide anion, which is nucleophilic and ready to react with the alkyl halide.

Potassium hydroxide's high reactivity ensures it efficiently removes the hydrogen atom from the nitrogen in phthalimide, facilitating the formation of the nucleophilic anion. This reaction is crucial because it prepares the phthalimide for the nucleophilic substitution that follows, involving the alkyl halide.
Amino Acid Synthesis
The ultimate goal of Gabriel synthesis is to produce amino acids, the building blocks of proteins. After forming N-alkylphthalimide, the final step involves hydrolyzing this intermediate compound.

Hydrolysis can be carried out using either acidic or basic conditions, where water and a hydrolyzing agent (e.g., HCl for acidic hydrolysis) cleave the N-alkylphthalimide, resulting in the formation of the amino acid. This step completes the Gabriel synthesis, transforming simple reactants into a fundamental biological molecule, an amino acid.

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Most popular questions from this chapter

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