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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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Ciclización de polieno programada habilitada por la interrupción de cromóforos

Megan M Solans1, Vitalii S Basistyi1, James A Law1

  • 1Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States.

Journal of the American Chemical Society
|April 4, 2022
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron una nueva estrategia de ciclización de polieno utilizando derivados de β-ionilo. Este método sintetiza eficientemente los propelanos complejos [4.4.1], mejorando la regioselectividad y permitiendo nuevas rutas sintéticas para productos naturales.

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Área de la Ciencia:

  • Química orgánica
  • Química sintética
  • Síntesis de productos naturales

Sus antecedentes:

  • La ciclización de polieno es una estrategia clave en la síntesis de productos naturales.
  • Las tácticas biomiméticas existentes a menudo sufren de una regioselectividad limitada.
  • El acceso a andamios policíclicos complejos como los propelanos [4.4.1] sigue siendo un desafío.

Objetivo del estudio:

  • Desarrollar una nueva estrategia regioselectiva de ciclización del polieno.
  • Para sintetizar [4.4.1]-propelanos con mejor eficiencia y alcance del sustrato.
  • Demostrar la utilidad de la nueva estrategia en la síntesis de productos naturales.

Principales métodos:

  • Desarrollo de una nueva estrategia de ciclización del polieno mediante la explotación de derivados β-ionilo.
  • Utilizando la desconexión fotoinducida para generar un polieno contratermodinámico.
  • Empleando la biciclización de Heck para la formación de [4.4.1]-propelanos.

Principales resultados:

  • La nueva estrategia en cascada mejora la selectividad regional en comparación con los métodos existentes.
  • El enfoque tolera una amplia gama de grupos ariles ricos en electrones y deficientes en electrones (hetero).
  • Se ha demostrado el éxito de la síntesis total desviada de taxodiona y salviasperanol.

Conclusiones:

  • La estrategia desarrollada ofrece una nueva y poderosa vía para los propelanos [4.4.1].
  • Este método supera las limitaciones en la regioselectividad y el alcance del sustrato de las tácticas anteriores.
  • El enfoque permite el acceso a los diterpenos abietánicos isoméricos anteriormente inaccesibles.