Chapter 12
Aldehydes and Ketones
Estructuras de aldehídos y cetonas
Vanillin—a flavoring agent in vanilla, cinnamaldehyde—a molecule responsible for the distinct smell of cinnamon, and acetone—a ...
Nomenclatura de aldehídos de la IUPAC
Aldehydes are named based on the systematic nomenclature rules set by the IUPAC. For acyclic aldehydes, the longest carbon chain containing the aldehydic ...
Nomenclatura de cetonas de la IUPAC
Like aldehydes, ketones are named using IUPAC rules; in this case, by replacing “e” in the name of the longest hydrocarbon chain with ...
Nombres comunes de aldehídos y cetonas
Some common aldehydes and ketones are popularly known by their common names used historically and predate the IUPAC nomenclature.
Common ...
Espectroscopía IR y UV-Vis de aldehídos y cetonas
Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In ...
Espectroscopía de RMN y espectrometría de masas de aldehídos y cetonas
In aldehydes, the hydrogen atom connected to the carbonyl carbon helps distinguish aldehydes from other carbonyl compounds using ¹H NMR spectroscopy. ...
Preparación de aldehídos y cetonas a partir de alcoholes, alquenos y alquinos
Aldehydes and ketones are prepared from alcohols, alkenes, and alkynes via different reaction pathways. Alcohols are the most commonly used substrates for ...
Preparación de aldehídos y cetonas a partir de nitrilos y ácidos carboxílicos
Although it is possible to reduce a carboxylic acid to an aldehyde, strong reducing agents, like lithium aluminum hydride (LAH), prohibit a controlled ...
Preparación de aldehídos y cetonas a partir de derivados del ácido carboxílico
Aldehydes are more reactive than carboxylic acids and hence, can get over-reduced to alcohol in the presence of strong reducing agents. Therefore, ...
Adición nucleofílica al grupo carbonilo: mecanismo general
The carbonyl carbon in an aldehyde or ketone is the site of a nucleophilic attack due to its electron-deficient nature. Depending on the strength of the ...
Aldehídos y cetonas con agua: formación de hidratos
An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also ...
Aldehídos y cetonas con alcoholes: formación de hemiacetales
Similar to water, alcohols can add to the carbonyl carbon of the aldehydes and ketones. The addition of one molecule of alcohol to the carbonyl compound ...
Grupos protectores de aldehídos y cetonas: Introducción
Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired ...
Acetales y tioacetales como grupos protectores de aldehídos y cetonas
Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, ...
Aldehídos y cetonas con HCN: descripción general de la formación de cianohidrinas
Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the ...
Aldehídos y cetonas con HCN: mecanismo de formación de cianohidrinas
Cyanohydrins are formed when cyanide nucleophiles and carbonyl compounds like aldehydes and ketones react. A strong base, the cyanide ion, catalyzes ...
Aldehídos y cetonas a alquenos: descripción general de la reacción de Wittig
The Wittig reaction is the conversion of carbonyl compounds—aldehydes and ketones—to alkenes using phosphorus ylides, or the Wittig reagent. ...
Aldehídos y cetonas a alquenos: mecanismo de reacción de Wittig
The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination ...
Aldehídos y cetonas con aminas: Formación de imina y enamina Descripción general
Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named ...
Aldehídos y cetonas con aminas: mecanismo de formación de iminas
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps ...
Aldehídos y cetonas con aminas: mecanismo de formación de enaminas
Enamine formation involves the addition of carbonyl compounds to a secondary amine through a series of reactions. The mechanism begins with the generation ...
Aldehídos y cetonas a alcanos: Reducción de Wolff-Kishner
Wolff–Kishner reduction involves converting aldehydes and ketones to alkanes using hydrazine and a base. The reaction converts a carbonyl group to a ...
Oxidaciones de aldehídos y cetonas a ácidos carboxílicos
Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily ...
Reacciones de aldehídos y cetonas: oxidación de Baeyer-Villiger
Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often ...
Tautomerismo ceto-enol: mecanismo
The keto and enol forms are known as tautomers and they constantly interconvert (or tautomerize) between the two forms under acid or base catalyzed ...
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