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Related Concept Videos

Cycloalkanes02:28

Cycloalkanes

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...
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...
Chair Conformation of Cyclohexane02:02

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...
Conformations of Cycloalkanes02:29

Conformations of Cycloalkanes

Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that was based on the...
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

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.
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.

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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[8]uril rotaxanes.

Vijayakumar Ramalingam1, Adam R Urbach

  • 1Department of Chemistry, Trinity University, 1 Trinity Place, San Antonio, Texas 78212, USA.

Organic Letters
|August 18, 2011
PubMed
Summary
This summary is machine-generated.

Researchers synthesized rotaxanes with a viologen core and cucurbituril macrocycle, finding stopper groups minimally impacted binding. Chemical modifications allowed tunable solubility and binding, creating adaptable artificial receptors.

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Area of Science:

  • Supramolecular Chemistry
  • Materials Science

Background:

  • Rotaxanes are mechanically interlocked molecules with potential applications in molecular machines and sensors.
  • Cucurbiturils are macrocyclic hosts known for their ability to bind various guests through non-covalent interactions.

Purpose of the Study:

  • To synthesize novel [2]rotaxanes incorporating a viologen core and cucurbit[8]uril macrocycle.
  • To investigate the influence of stopper groups on guest binding within these rotaxane structures.
  • To explore chemical modifications for controlling solubility and binding properties of artificial receptors.

Main Methods:

  • Synthesis of rotaxane structures with viologen cores, cucurbit[8]uril macrocycles, and tetraphenylmethane stoppers.
  • Binding studies of rotaxanes with second guests in both organic and aqueous media.
  • Chemical modification of the threaded guest to alter solubility and binding characteristics.

Main Results:

  • Successful synthesis of [2]rotaxanes featuring a viologen core threaded through a cucurbit[8]uril macrocycle.
  • Stopper groups (tetraphenylmethane) exhibited minimal effect on the binding affinity of the rotaxanes.
  • Chemical modification of the threaded guest effectively controlled solubility and binding properties.

Conclusions:

  • The study demonstrates a versatile method for creating artificial receptors with tunable properties.
  • The findings highlight the potential of chemically modified rotaxanes as adaptable molecular recognition systems.
  • This work contributes to the development of novel supramolecular materials with tailored functionalities.