Ester Amide
Ester Amide - Related Videos
01:01
Mass Spectrometry: Carboxylic Acid, Ester, and Amide Fragmentation
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2024
The fragmentation patterns observed for compounds such as carboxylic acids, esters, and amides in the mass spectra include ⍺-cleavage and McLafferty rearrangement. Fragmentation by ⍺-cleavage preferentially occurs at the carbon-carbon bond at the ⍺-position next to the carboxylic group to generate a neutral radical and a cation. Long chain compounds with hydrogen at their γ-carbon undergo McLafferty rearrangement to give a radical cation and a neutral alkene. For example, the fragmentation of...
04:10
Hydrolysis of an Ester - Concepts
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2020
Triglycerides Triglycerides are triester molecules composed of a glycerol backbone that is bound to 3 fatty acids. These form the basis of many biological lipids that are found in vegetable oils and fats. Lipids that are isolated from plant material are the basis of vegetable oils, whereas lipids extracted from animals are used as lard or general sources of fats. A fatty acid molecule has a long carbon chain — between 12 and 20 carbons — with a weak organic acid at one end. Some fatty acids...
11:04
Hydrolysis of an Ester - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA Preparation of SoapExpand Soap is prepared using a saponification reaction, where a base catalyzes the hydrolysis of three ester groups of an oil, such as coconut oil. During saponification, hydroxide ions from the base attack the carbonyl group on the oil to form a ratio of three molecules of soap to one molecule of glycerol. The resulting soap molecule is a long carbon chain, which is...
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...
01:28
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...
FAQs
Acyl substitution starts when a nucleophile attacks an electrophilic carbonyl carbon. This addition produces a tetrahedral intermediate, in which the carbonyl geometry temporarily changes. Elimination then removes a substituent and reforms the carbonyl bond. This sequence provides a mechanistic framework for analyzing how each carbonyl reacts within an ester amide structure.
Resonance stabilizes the amide group by distributing electron density around its atoms, making its carbonyl less reactive toward nucleophilic acyl substitution than the ester carbonyl. This difference is important when comparing the two linkages, because it connects electronic structure with observed reactivity and helps explain contrasting behavior within the same molecule.
Placing ester and amide carbonyl groups in one molecule creates a useful system for examining how neighboring functional groups affect molecular behavior. Their different resonance stabilization and reactivity can alter the compound's overall response to nucleophilic attack or hydrolysis. Such compounds therefore support structure-reactivity studies rather than serving only as isolated functional-group examples.
Hydrolysis studies examine how acidic or basic conditions affect the two acyl linkages. Under suitable conditions, either the ester linkage, the amide linkage, or both can undergo cleavage. Comparing these outcomes helps researchers relate reaction conditions to carbonyl reactivity and evaluate how the compound's structure governs its chemical transformation.
Their combination of ester and amide functionality supports work across several areas of chemistry. Ester amide compounds are used in pharmaceutical design, degradable polymer development, and functional materials research. In these settings, their differing carbonyl reactivities and hydrolytic behavior can help connect molecular structure with properties relevant to degradation and material function.
These compounds provide models for investigating acyl substitution and for comparing how related carbonyl groups respond to nucleophiles, acids, or bases. The resulting structure-reactivity information can guide interpretation of molecular behavior and support the design of compounds with useful chemical properties, including pharmaceutical structures, degradable polymers, and functional materials.