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Related Concept Videos

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

Cycloaddition Reactions: MO Requirements for Thermal Activation

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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

1.7K
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

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

7.9K
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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Cycloalkanes02:28

Cycloalkanes

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Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
The IUPAC nomenclature of cycloalkanes follows similar rules that apply to...
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Related Experiment Video

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18F-Labeling of Radiotracers Functionalized with a Silicon Fluoride Acceptor SiFA for Positron Emission Tomography
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18F-labeling using click cycloadditions.

Kathrin Kettenbach1, Hanno Schieferstein1, Tobias L Ross2

  • 1Institute of Nuclear Chemistry, Johannes Gutenberg University Mainz, 55128 Mainz, Germany.

Biomed Research International
|July 9, 2014
PubMed
Summary
This summary is machine-generated.

Developing new fluorine-18 radiolabeling methods is crucial for positron emission tomography (PET) applications. This review highlights click chemistry approaches for mild and efficient (18)F-labeling of sensitive biomolecules.

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Area of Science:

  • Radiochemistry
  • Biomedical Imaging
  • Organic Chemistry

Background:

  • Positron emission tomography (PET) applications are expanding, increasing the demand for novel fluorine-18 ((18)F) radiotracers.
  • Introducing (18)F into sensitive biomolecules often requires harsh conditions, posing significant challenges for tracer development.
  • Key challenges in (18)F-labeling include achieving regioselectivity and performing reactions quickly under mild conditions.

Purpose of the Study:

  • To review the development of novel (18)F-labeled prosthetic groups for click cycloaddition reactions.
  • To summarize recent trends in both copper-catalyzed and copper-free click chemistry for (18)F-radiolabeling.
  • To address the need for efficient and mild radiolabeling of complex biomolecules for PET imaging.

Main Methods:

  • Focuses on copper-catalyzed azide-alkyne cycloaddition (CuAAC) reactions.
  • Discusses various copper-free click reactions for radiolabeling.
  • Highlights the use of (18)F-labeled prosthetic groups.

Main Results:

  • Click chemistry methods offer mild conditions suitable for sensitive biomolecules.
  • CuAAC and copper-free click reactions enable regioselective and high-yielding (18)F-labeling.
  • Development of novel prosthetic groups facilitates efficient (18)F incorporation.

Conclusions:

  • Click chemistry represents a powerful strategy for developing new (18)F-labeled PET tracers.
  • These methods overcome limitations of direct (18)F-labeling, enabling broader application in molecular imaging.
  • Continued innovation in prosthetic groups and click reactions will advance PET tracer design.