Base Catalyzed Hydrolysis
Base Catalyzed Hydrolysis - Related Videos
01:13
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis
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2025
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols. During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
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...
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...
01:08
Hydrolysis of ATP
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2019
The bonds of adenosine triphosphate (ATP) can be broken through the addition of water, releasing one or two phosphate groups in an exergonic process called hydrolysis. This reaction liberates the energy in the bonds for use in the cell—for instance, to synthesize proteins from amino acids. If one phosphate group is removed, a molecule of ADP—adenosine diphosphate—remains, along with inorganic phosphate. ADP can be further hydrolyzed to AMP—adenosine monophosphate—by the removal of a second...
02:26
Base-Catalyzed Ring-Opening of Epoxides
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2025
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
FAQs
Hydroxide ion acts as the nucleophile, meaning it supplies an electron-rich species that attacks the carbonyl carbon of an ester. This addition temporarily changes the carbonyl structure into a tetrahedral intermediate. That intermediate is central to the nucleophilic acyl substitution mechanism because it allows the original ester structure to reorganize before products form.
The tetrahedral intermediate connects hydroxide addition with bond cleavage. After it forms, the intermediate collapses, restoring the carbonyl arrangement while expelling an alkoxide group. This sequence explains how the ester framework is converted into separate products rather than simply undergoing an unspecified reaction with water.
When the tetrahedral intermediate collapses, an alkoxide leaves the acyl portion of the original ester. Subsequent proton transfer converts the expelled alkoxide into an alcohol and leaves the acyl product as a carboxylate. Following these steps clarifies the product identities and illustrates the individual events in nucleophilic acyl substitution.
Saponification refers specifically to ester hydrolysis when the products include soap-like carboxylate salts. It therefore describes a particular outcome within the broader reaction topic, rather than a separate mechanistic class. Recognizing this relationship helps connect the formation of carboxylates with the practical terminology used for basic ester cleavage.
A useful analysis follows the reaction sequence in order: hydroxide attack at the carbonyl carbon, formation of the tetrahedral intermediate, intermediate collapse with alkoxide expulsion, and proton transfer. Examining these stages shows how bond changes produce the final alcohol and carboxylate and provides a framework for discussing reaction kinetics.
Chemists can apply this reaction to prepare or cleave organic compounds and to investigate how nucleophilic acyl substitution occurs. The topic also supports kinetic analysis, allowing researchers to relate the observed reaction behavior to its mechanism. Its relevance extends across ester chemistry and to other compounds, including amides, that undergo hydrolysis.