Video Experimental Relacionado
Updated: Jul 6, 2026
![Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F51444.jpg&w=3840&q=50)
11:44
Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-(phosphinetriyl)tripiperidine]}palladium Under Mild Reaction Conditions
Published on: March 21, 2014
El acoplamiento catalizado por paladio de amoníaco y amida de litio con haluros de arilo
1Department of Chemistry, Yale University, Post Office Box 208107, New Haven, Connecticut 06520-8107, USA.
Journal of the American Chemical Society
|August 3, 2006
Resumen
Un nuevo método de acoplamiento catalizado por paladio produce eficientemente arilaminas primarias a partir de haluros de arilo y amoníaco. Esta reacción muestra una alta selectividad, minimizando la formación de diarilamina y permitiendo el aislamiento de un nuevo complejo de organopalladio.
Área de la Ciencia:
- Química orgánica es la química orgánica.
- La catálisis de la catálisis.
- Química organometálica Química orgánica de los metales.
Sus antecedentes:
- Las reacciones de acoplamiento cruzado catalizadas por paladio son vitales en la síntesis orgánica.
- La síntesis eficiente de las arylaminas primarias sigue siendo un desafío.
- El control de la selectividad en las reacciones de aminación es crucial.
Objetivo del estudio:
- Desarrollar un método suave y selectivo catalizado por paladio para la síntesis primaria de arylamina.
- Para investigar la formación de intermediarios de organopalladio en este proceso.
Principales métodos:
- Acoplamiento de haluros de arilo con amoníaco o amida de litio utilizando un catalizador de paladio.
- Aislamiento y caracterización de los complejos de organopalladio.
- Análisis de la selectividad de la reacción a través de relaciones de producto.
Principales resultados:
- Se logró un ligero acoplamiento catalizado por el paladio de haluros de arilo con amoníaco/amida de litio.
- Las arylaminas primarias se formaron como el producto principal con alta selectividad (9.5:1 a >50:1 arylamina:diarylamina).
- Se aisló el primer complejo de organopalladio con un ligando terminal -NH2, que elimina de manera reductiva para producir arylaminas.
Conclusiones:
- El método desarrollado proporciona una ruta eficiente a las arylaminas primarias.
- La alta selectividad ofrece una ventaja sobre los métodos de aminación existentes.
- El complejo de organopalladio aislado proporciona conocimientos mecanicistas sobre la formación de arylamina.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:07Acid Halides to Amides: Aminolysis
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
01:20Amides to Amines: LiAlH4 Reduction
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.
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.
00:55Nitriles to Amines: LiAlH4 Reduction
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
01:30Preparation of Amines: Alkylation of Ammonia and Amines
Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
01:13Preparation of Amines: Reduction of Amides and Nitriles
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,...
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...