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Related Concept Videos

Catalysis02:50

Catalysis

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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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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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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The Hofmann and Curtius rearrangement reactions can be applied to synthesize primary amines from carboxylic acid derivatives such as amides and acyl azides. In the Hofmann rearrangement, a primary amide undergoes deprotonation in the presence of a base, followed by halogenation to generate an N-haloamide. A second proton abstraction produces a stabilized anionic species, which rearranges to an isocyanate intermediate via an alkyl group migration from the carbonyl carbon to the neighboring...
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Updated: Dec 9, 2025

Quantitative SERS Detection of Uric Acid via Formation of Precise Plasmonic Nanojunctions within Aggregates of Gold Nanoparticles and Cucurbit[n]uril
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Cucurbit[n]urils for Supramolecular Catalysis.

Bohan Tang1, Jiantao Zhao1, Jiang-Fei Xu1

  • 1Key Laboratory of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 10, 2020
PubMed
Summary
This summary is machine-generated.

Cucurbit[n]urils (CB[n]s) are versatile supramolecular hosts that enable efficient and selective catalysis. This review details three key mechanisms of CB[n]-based catalysis, highlighting their role as nanoreactors and modulators of reactivity.

Keywords:
cucurbit[n]urilenzyme catalysishost-guest systemssupramolecular chemistry

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Area of Science:

  • Supramolecular Chemistry
  • Catalysis
  • Host-Guest Chemistry

Background:

  • Controlling chemical reactivity and selectivity is a key challenge in chemistry.
  • Supramolecular catalysis utilizes non-covalent interactions for efficient and selective transformations.
  • Cucurbit[n]urils (CB[n]s) are unique macrocyclic hosts with tunable properties.

Purpose of the Study:

  • To review the major mechanisms of supramolecular catalysis mediated by cucurbit[n]urils (CB[n]s).
  • To highlight the structural features of CB[n]s that enable their catalytic activity.
  • To discuss recent advancements and future prospects in CB[n]-based supramolecular catalysis.

Main Methods:

  • Summarization of existing literature on CB[n]-based supramolecular catalysis.
  • Analysis of the mechanisms by which CB[n]s influence reaction pathways.
  • Discussion of CB[n]s as nanoreactors and steric controllers.

Main Results:

  • CB[n]s function as nanoreactors, encapsulating substrates to influence reactivity.
  • The rigid structure and electronegative portals of CB[n]s provide steric hindrance and modulate substrate interactions.
  • CB[n]s can catalyze reactions by altering the reactivity of ionized intermediates.

Conclusions:

  • CB[n]-based supramolecular catalysis offers distinct advantages due to the unique properties of CB[n] hosts.
  • Understanding these mechanisms provides insights for designing novel catalytic systems.
  • This field holds significant potential for future development in selective chemical synthesis.