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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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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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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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

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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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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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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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One-pot access to push-pull oligoenes by sequential [2 + 2] cycloaddition-retroelectrocyclization reactions.

Govindasamy Jayamurugan1, Aaron D Finke, Jean-Paul Gisselbrecht

  • 1Laboratorium für Organische Chemie, ETH-Zürich , Hönggerberg, HCI, CH-8093 Zürich, Switzerland.

The Journal of Organic Chemistry
|December 17, 2013
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel polycyano-substituted oligoenes using a cycloaddition-retroelectrocyclization reaction. These new push-pull chromophores exhibit enhanced electron-accepting properties and reduced HOMO-LUMO gaps compared to precursors.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Photochemistry

Background:

  • Donor-substituted tetracyanobuta-1,3-dienes (TCBDs) are versatile building blocks.
  • Push-pull substituted oligoenes are of interest for their electronic and optical properties.

Purpose of the Study:

  • To synthesize novel polycyanohexa-1,3,5-trienes (TCHTs and PCHTs) and polycyanoocta-1,3,5,7-tetraenes.
  • To investigate the electronic and optical properties of these novel chromophores.

Main Methods:

  • Employing a formal [2 + 2] cycloaddition-retroelectrocyclization reaction.
  • Utilizing a one-pot protocol involving tetracyanoethylene and donor-substituted alkynes.

Main Results:

  • Successfully synthesized donor-substituted, π-conjugated TCHTs, PCHTs, and polycyanoocta-1,3,5,7-tetraenes.
  • Bis-(N,N-dialkylanilino) substituted push-pull trienes and tetraenes demonstrated superior electron-accepting potency.
  • These compounds exhibited lower HOMO-LUMO gaps compared to their TCBD precursors, confirmed by optical and electrochemical studies.

Conclusions:

  • The [2 + 2] cycloaddition-retroelectrocyclization reaction is an effective method for synthesizing push-pull oligoenes.
  • The synthesized TCHTs, PCHTs, and polycyanoocta-1,3,5,7-tetraenes possess promising electronic and optical characteristics.
  • These findings contribute to the development of new materials with tunable electronic properties.