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Videos de Conceptos Relacionados

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
Base-Promoted α-Halogenation of Aldehydes and Ketones00:51

Base-Promoted α-Halogenation of Aldehydes and Ketones

α-Halogenation of aldehydes and ketones is a reaction involving the substitution of α hydrogens with halogens in the presence of a base.  The reaction begins with the abstraction of  α hydrogen by the base to produce a nucleophilic enolate ion. This intermediate undergoes a subsequent nucleophilic substitution with the halogen to produce a monohalogenated carbonyl compound. If the starting substrate has more than one α hydrogen, it is difficult to stop the reaction at the stage of...
α-Alkylation of Ketones via Enolate Ions01:10

α-Alkylation of Ketones via Enolate Ions

Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the strong interaction...
α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the bromine molecule...
Oxidations of Aldehydes and Ketones to Carboxylic Acids01:15

Oxidations of Aldehydes and Ketones to Carboxylic Acids

Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation01:22

Reactions of Aldehydes and Ketones: Baeyer–Villiger Oxidation

Baeyer–Villiger oxidation converts aldehydes to carboxylic acids and ketones to esters. The reaction uses peroxy acids or peracids and is often catalyzed by acid. The reaction is named after its pioneers, Adolf von Baeyer and Victor Villiger. The reaction is achieved by a wide range of peracids such as m-chloroperoxybenzoic acid (mCPBA), perbenzoic acid (C6H5COOOH), peracetic acid (CH3COOOH), hydrogen peroxide (H2O2), and tert-butyl hydroperoxide (t-BuOOH).
The carbonyl center is activated by...

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Las aldehidas α-borilo anfotéricas.

Zhi He1, Andrei K Yudin

  • 1Davenport Research Laboratories, Department of Chemistry, University of Toronto, Ontario, Canada.

Journal of the American Chemical Society
|August 4, 2011
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron una nueva clase de moléculas estables llamadas α-boril aldehídos. Estos compuestos son versátiles bloques de construcción para la síntesis de moléculas orgánicas complejas, incluyendo aminoácidos no naturales.

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Área de la Ciencia:

  • Química orgánica es la química orgánica.
  • Química sintética de la química sintética.
  • Síntesis de las moléculas.

Sus antecedentes:

  • Los protocolos establecidos para sintetizar derivados funcionalizados del ácido borónico son limitados.
  • Existe la necesidad de nuevas rutas sintéticas para acceder a diversas moléculas orgánicas.

Objetivo del estudio:

  • Para informar sobre una nueva clase de moléculas estables, los aldehídos de α-borilo.
  • Para demostrar la utilidad de los aldehídos de α-borilo como versátiles bloques de construcción sintéticos.

Principales métodos:

  • Preparación de aldehídos de α-borilo a partir de boronatos de oxiranilo N-metiliminodiacetilo a través de la migración del 1,2-borilo y la escisión del epoxido.
  • Utilizando aldehídos de α-borilo para transformaciones quimioselectivas.

Principales resultados:

  • Sintetizó con éxito aldehídos α-borilo, una nueva clase de moléculas estables.
  • Acceso demostrado a una amplia gama de derivados funcionalizados del ácido borónico, incluidas las iminas de borilo, los alquenos, los alcoholes, los ácidos, los éteres de enol y las enamidas.
  • Se logró una fácil síntesis de aminoácidos no naturales funcionalizados a partir de sililoxi y amido boronatos de vinilo.

Conclusiones:

  • Los aldehídos de α-borilo representan un avance significativo en la química orgánica sintética.
  • Estos nuevos bloques de construcción ofrecen rutas eficientes a moléculas complejas que antes eran difíciles o imposibles de sintetizar.
  • El potencial de los α-boril aldehídos en la síntesis química es sustancial, especialmente para acceder a aminoácidos no naturales.