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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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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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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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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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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Pericyclic Reactions: Introduction01:17

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
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Cyclopropenes in Photochemical Reactions.

David Suárez-García1, Darío Coto1, Rubén Vicente1

  • 1Departamento De Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica "Enrique Moles" and Centro de Innovación en Química Avanzada (ORFEO-CINQA), Universidad De Oviedo, Oviedo, Spain.

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Summary
This summary is machine-generated.

This review explores the complex photochemistry of cyclopropenes, highlighting their synthetic potential under light irradiation. It details light-mediated reactions and their emerging applications in bio-orthogonal chemistry.

Keywords:
cyclopropenesorganic synthesisphotochemistryradicals

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Synthetic Chemistry

Background:

  • Cyclopropenes exhibit complex photochemical behavior.
  • The synthetic utility of cyclopropene photochemistry has lagged behind advances in synthetic photochemistry.
  • Fundamental studies on cyclopropene photochemistry exist but lack comprehensive synthetic exploration.

Purpose of the Study:

  • To review the light-mediated reactivity of cyclopropenes.
  • To focus on the synthetic applications derived from cyclopropene photochemical reactions.
  • To introduce the use of cyclopropenes in light-mediated bio-orthogonal reactions.

Main Methods:

  • Literature review of photochemical reactions involving cyclopropenes.
  • Analysis of synthetic transformations enabled by light irradiation of cyclopropenes.
  • Exploration of reactions between ground-state cyclopropenes and photo-excited molecules.

Main Results:

  • Overview of key types of light-mediated cyclopropene reactivity.
  • Identification of synthetic pathways utilizing cyclopropene photochemistry.
  • Discussion of cyclopropenes' role in photo-induced reactions with other molecules.
  • Introduction to bio-orthogonal applications of cyclopropenes.

Conclusions:

  • Cyclopropene photochemistry offers significant, yet underexplored, synthetic potential.
  • Light-mediated reactions of cyclopropenes are versatile tools for organic synthesis.
  • Emerging applications in bio-orthogonal chemistry demonstrate the broader value of cyclopropene photochemistry.