Amines Amides
Amines Amides - Related Videos
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...
01:20
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.
01:13
Preparation of Amines: Reduction of Amides and Nitriles
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2023
Nitriles can be reduced to primary amines using reducing agents like lithium aluminum hydride or catalytic hydrogenation. The reduction introduces an amino group with an extra carbon in the skeleton. Nitriles are formed from the reaction between alkyl halides and sodium cyanide through the SN2 mechanism. Primary alkyl halides are the preferred substrates to prepare nitriles. Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
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...
07:20
Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
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Cited by 1 •
2014
This protocol describes the use of amide coupling reactions of isonicotinic acid and diaminoalkanes to form bridging ligands suitable for use in the synthesis of multinuclear platinum complexes, which combine aspects of the anticancer drugs BBR3464 and picoplatin.
FAQs
Amide basicity is reduced because the nitrogen lone pair is delocalized into the adjacent carbonyl group through resonance. As a result, that electron pair is less available to accept a proton than the corresponding lone pair in an amine. This difference explains why the two functional groups show contrasting reactivity in proton-transfer reactions and why amides have distinctive stability.
In amines, the nitrogen lone pair supports two complementary behaviors: it can accept a proton, giving the compound basic character, or act as a nucleophile during a reaction. These behaviors arise from the same electron pair. Their importance makes amines versatile participants in organic synthesis and in the construction or modification of nitrogen-containing molecules.
Resonance in an amide does more than lower basicity; it also links the nitrogen to the carbonyl-containing portion of the molecule. This delocalization contributes to the functional group’s stability and influences its participation in acyl substitution, a reaction pattern used to replace or modify groups attached to the carbonyl. Electronic structure therefore connects amide behavior with synthetic use.
Alkylation matters because it is one of the reaction classes available for building and modifying nitrogen-containing molecules. In the context of amines, the nitrogen lone pair provides the electronic basis for their reactivity, so alkylation connects a specific amine property with a useful synthetic transformation. This makes the reaction relevant to organic, pharmaceutical, and materials chemistry.
Proton-transfer behavior helps distinguish the two groups during reaction planning. An amine’s lone pair commonly participates in proton acceptance, while resonance makes an amide’s lone pair less available for that role. This comparison gives chemists a structural basis for anticipating different behavior and choosing whether amine or amide functionality better suits a target molecule.
Several reaction classes can be considered when chemists need to modify these functional groups: proton transfer, alkylation, acyl substitution, and hydrolysis. They do not serve identical purposes. Their inclusion in the reaction toolkit allows researchers to connect functional-group behavior with molecular construction and alteration, rather than treating amines and amides as merely structural labels.
These functional groups occur in amino acids and proteins as well as in drugs, polymers, dyes, and industrially important compounds. Their contrasting electron behavior links molecular structure to function: nitrogen-centered reactivity supports chemical transformations, while amide stability contributes to the persistence of structures used in biological and material contexts. This breadth makes them important across chemistry and biochemistry.