Video Experimental Relacionado

Updated: Jul 4, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Published on: June 21, 2017

La 1,3-isomerización altamente selectiva de los alcoholes alílicos a través de la oxocatálisis con renio

Christie Morrill¹, Robert H Grubbs

¹Arnold and Mabel Beckman Laboratory of Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

Journal of the American Chemical Society

|March 3, 2005

Resumen

Este estudio introduce dos nuevas estrategias catalíticas para la isomerización selectiva de 1,3-isomerización de alcoholes alílicos. Estos métodos logran altos rendimientos y estereoselectividad, ofreciendo una síntesis eficiente de valiosos productos químicos intermedios.

Área de la Ciencia:

Química orgánica es la química orgánica.
La catálisis por catálisis.
Metodología sintética de la metodología sintética.

Sus antecedentes:

Los alcoholes aliales son versátiles intermediarios sintéticos.
Las reacciones de isomerización son cruciales para modificar las estructuras moleculares.
La síntesis selectiva de isómeros específicos sigue siendo un desafío en la química orgánica.

Objetivo del estudio:

Desarrollar métodos altamente selectivos para la 1,3-isomerización de alcoholes alílicos.
Explorar sistemas catalíticos para una síntesis eficiente de isómeros.
Para investigar las transformaciones estereoselectivas de los alcoholes alelicos.

Principales métodos:

Utilizando O3ReOSiPh3 como catalizador para la isomerización del alcohol alílico.
Empleando control termodinámico para sustratos con 1,3-regioisómeros conjugados.
El uso de N,O-bis ((trimethylsilyl) acetamide) como aditivo para el equilibrio de la reacción de desplazamiento.
Investigando la isomerización de los alcoholes alilicos terciarios a los alcoholes alilicos primarios.

Principales resultados:

Se logró una isomerización altamente selectiva de 1,3-isomerización de varios alcoholes alílicos.
Control termodinámico demostrado para tipos específicos de sustrato.
Se empleó con éxito un aditivo para impulsar la reacción de los alcoholes alilicos terciarios.
Se observó una alta estereoselectividad en la isomerización de sustratos enriquecidos con enantio.

Conclusiones:

Desarrolló dos estrategias efectivas para la isomerización selectiva del alcohol alilico.
Los métodos proporcionan un acceso eficiente a los valiosos isómeros de alcohol alílico.
Se logró una alta estereoselectividad, expandiendo la utilidad sintética.

Más Videos Relacionados

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

Chemoselective Preparation of 1-Iodoalkynes, 1,2-Diiodoalkenes, and 1,1,2-Triiodoalkenes Based on the Oxidative Iodination of Terminal Alkynes

Published on: September 12, 2018

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Versatile CO₂ Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

Videos de Conceptos Relacionados

E1 Reaction: Stereochemistry and Regiochemistry

E1 Reaction: Stereochemistry and Regiochemistry

One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...

Hydroboration-Oxidation of Alkenes

Hydroboration-Oxidation of Alkenes

In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.