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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.
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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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.
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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.
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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.
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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
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Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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Es una isomerización simple, quimioselectiva y catalítica de las olefinas.

Steven W M Crossley1, Francis Barabé, Ryan A Shenvi

  • 1Department of Chemistry, The Scripps Research Institute , La Jolla, California 92037, United States.

Journal of the American Chemical Society
|November 15, 2014
PubMed
Resumen

Los catalizadores de cobalto isomerizan los alquenos terminales y ciclizan los dienes. Estos catalizadores también abren anillos tensados, tolerando varios grupos funcionales como aminas y epoxidos.

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Área de la Ciencia:

  • Química organometálica Química orgánica de los metales.
  • La catálisis de la catálisis.
  • Síntesis orgánica La síntesis orgánica.

Sus antecedentes:

  • La isomerización de alquenos es una transformación fundamental en la química orgánica.
  • El desarrollo de catalizadores eficientes y selectivos para la isomerización de alquenos y reacciones relacionadas es crucial.
  • Comprender el comportamiento del catalizador con diversos grupos funcionales es clave para las aplicaciones prácticas.

Objetivo del estudio:

  • Para investigar la actividad catalítica de Co ((Sal ((tBu,tBu)) Cl con organosilanos para la isomerización de alqueno.
  • Explorar el alcance de estos catalizadores en la cicloisomerización de dienes y la retrocicloisomerización de anillos tensados.
  • Evaluar la tolerancia del sistema catalítico hacia varios grupos funcionales.

Principales métodos:

  • Utilizando complejos de cobalto, específicamente Co ((Sal ((tBu,tBu)) Cl, como catalizadores.
  • El uso de organosilanos como co-catalizadores o activadores.
  • Investigando las reacciones que incluyen la isomerización terminal de alqueno, la cicloisomerización de dieno y la apertura del anillo tensado.

Principales resultados:

  • Las cantidades catalíticas de Co ((Sal ((tBu,tBu)) Cl y organosilano isomerizan irreversiblemente los alquenos terminales por una posición.
  • El sistema catalítico afecta con éxito la cicloisomerización de los dienes.
  • También se logró la retrocicloisomerización de anillos tensados utilizando los mismos catalizadores.
  • Los catalizadores demostraron tolerancia hacia las bases fuertes de Lewis (aminas, imidazoles) y las funcionalidades labiles (epoxidos).

Conclusiones:

  • Co(Sal(tBu,tBu))Cl con organosilanos proporciona un sistema catalítico eficaz para la isomerización de alqueno.
  • El sistema catalizador exhibe versatilidad, permitiendo la cicloisomerización de dieno y la apertura del anillo tensado.
  • La tolerancia observada del grupo funcional expande la utilidad sintética de este enfoque catalítico.