Sodium Amide
Sodium Amide - Related Videos
01:29
Preparation of Amides
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2023
Amides are synthesized by treating carboxylic acids with amines in the presence of dehydrating agents like dicyclohexylcarbodiimide (DCC). The DCC-promoted synthesis of amides begins with the protonation of DCC by carboxylic acid. The protonation makes it a better acceptor. Next, the addition of carboxylate to the protonated carbodiimide gives a reactive acylating agent. Subsequently, the amine acts as a nucleophile that attacks the acylating agent to form a tetrahedral intermediate. In the...
01:19
Amines to Amides: Acylation of Amines
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2025
Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond. Next, the second equivalent of amine serves as a Brønsted base and deprotonates the quaternary amide...
01:28
Amides to Carboxylic Acids: Hydrolysis
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2023
Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions. Acid-catalyzed hydrolysis: Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat. The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
01:07
Acid Halides to Amides: Aminolysis
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2025
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively. In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
01:20
Amides to Amines: LiAlH4 Reduction
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2025
Amide reduction with strong reducing agents like lithium aluminum hydride proceeds through a nucleophilic acyl substitution to form amines. Primary, secondary, and tertiary amides yield primary, secondary, and tertiary amines, respectively. Amide reduction requires two equivalents of the reducing agent, acting as a source of hydride ions. As shown in the figure, the reaction is initiated with a nucleophilic attack by the hydride ion at the carbonyl carbon to form a tetrahedral intermediate.
FAQs
Its amide ion, NH₂⁻, accepts protons from suitable weak acids, including terminal alkynes, alcohols, and some carbonyl compounds. This deprotonation produces anions with substantially greater reactivity than the original neutral molecules. Depending on the substrate, those anions can function as nucleophiles or bases, creating intermediates that support subsequent bond-forming transformations.
Liquid ammonia or another suitable medium provides the environment in which sodium amide can deprotonate the selected substrate and generate its reactive anion. The medium therefore influences whether the intended intermediate forms and can participate in synthesis. Moisture is especially unsuitable because sodium amide reacts vigorously with water, undermining dry reaction conditions and safe handling.
The substrate must contain a proton that the amide ion can remove, as occurs with terminal alkynes, alcohols, and some carbonyl compounds. After deprotonation, the resulting anion must also have a productive role, either attacking another species as a nucleophile or removing a proton as a base. These two steps connect acidity with the desired synthetic outcome.
Once generated, the anions serve as reactive partners rather than merely as deprotonated substrates. Their nucleophilic behavior can support selected substitutions and other transformations that construct carbon-carbon or carbon-nitrogen bonds. Their basic behavior can also drive further reaction steps. Sodium amide is therefore valuable because it creates intermediates that directly expand synthetic connectivity.
A typical approach begins with a suitable substrate and a moisture-free reaction environment, often using liquid ammonia or another appropriate medium. Sodium amide is then used to remove a proton and form the corresponding anion. The reaction is directed toward the desired transformation, such as alkyne formation, condensation, or selected nucleophilic substitution.
It is useful when synthesis requires generation of a carbon-based anion from a terminal alkyne or from a related precursor under suitable conditions. The resulting reactive species can participate in a subsequent transformation, allowing the alkyne framework to support further carbon-carbon bond construction. This role makes sodium amide relevant to multistep organic synthesis.
The overview identifies three important uses: alkyne formation, condensation reactions, and selected nucleophilic substitutions. Across these applications, sodium amide first enables formation of a reactive anion, then that intermediate participates in the target transformation. The reagent is consequently useful when a synthesis depends on controlled generation of strong basic or nucleophilic reactivity.
Moisture-free conditions are essential because sodium amide reacts vigorously with water. Practical planning must therefore prevent contact with water during preparation and use, while maintaining the selected reaction medium needed for anion formation. This requirement is both a safety consideration and a chemical one, since uncontrolled reaction with water consumes the reagent and disrupts the intended synthesis.