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Related Concept Videos

Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

4.1K
Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
4.1K
Crown Ethers02:36

Crown Ethers

6.2K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
6.2K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

4.1K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
4.1K
Oxymercuration-Reduction of Alkenes02:36

Oxymercuration-Reduction of Alkenes

9.5K
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
9.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

31.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
31.4K
Conformations of Cyclohexane02:11

Conformations of Cyclohexane

16.6K
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...
16.6K

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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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O6-Corona[6]arenes with Expanded Cavities for Specific Complexation with C70.

Yao Lu1, Zhan-Da Fu1, Qing-Hui Guo1

  • 1Key Laboratory of Bioorganic Phosphorus Chemistry and Chemical Biology (Ministry of Education), Tsinghua University , Beijing 100084, China.

Organic Letters
|March 22, 2017
PubMed
Summary

New O6-corona[3]arene[3]tetrazines and O6-corona[3]arene[3]pyridazines were synthesized. The tetrazine derivatives selectively bind C70 fullerene, showcasing their potential as specific molecular receptors.

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Area of Science:

  • Supramolecular Chemistry
  • Organic Synthesis
  • Materials Science

Background:

  • Macrocyclic chemistry is crucial for developing selective host molecules.
  • Tetrazines and pyridazines are versatile nitrogen-containing heterocycles with unique electronic properties.
  • Fullerene complexation remains a significant challenge in supramolecular chemistry.

Purpose of the Study:

  • To synthesize novel O6-corona[3]arene[3]tetrazines and O6-corona[3]arene[3]pyridazines.
  • To investigate the host-guest properties of these macrocycles, particularly their interaction with fullerenes.
  • To explore the structure-property relationships governing fullerene selectivity.

Main Methods:

  • One-pot SNAr reaction for tetrazine synthesis.
  • Macrocycle-to-macrocycle transformation involving inverse electron-demand Diels-Alder (IEDDA) cycloaddition and denitrogenative aromatization.
  • Spectroscopic and crystallographic analyses to characterize the synthesized macrocycles.
  • Binding studies in toluene to determine complexation constants with C60 and C70 fullerenes.

Main Results:

  • Successfully synthesized O6-corona[3]arene[3]tetrazines and O6-corona[3]arene[3]pyridazines.
  • O6-corona[6]arenes exhibited coronary conformations with hexagonal cavities.
  • O6-corona[3]arene[3]pyridazines showed nonselective complexation of C60 and C70.
  • O6-corona[3]arene[3]tetrazines demonstrated selective binding of C70 with high affinity (K1:1 up to 3.98 × 10^4 M^-1).

Conclusions:

  • The synthesized O6-corona[3]arene[3]tetrazines are effective and selective receptors for C70 fullerene.
  • The macrocyclic structure and cavity size play a critical role in host-guest selectivity.
  • These findings open avenues for designing tailored supramolecular hosts for specific fullerene derivatives.