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Related Concept Videos

Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.3K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
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Carbocations02:10

Carbocations

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Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
11.7K
Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

2.3K
Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
2.3K
π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds01:14

π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds

1.3K
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as...
1.3K
Electron Carriers01:24

Electron Carriers

86.0K
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
86.0K
Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals01:17

Electron Paramagnetic Resonance (EPR) Spectroscopy: Organic Radicals

2.7K
Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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Related Experiment Video

Updated: Sep 16, 2025

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

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Electronically diverse carbenes.

André B Charette1

  • 1Department of Chemistry, Université de Montréal, Montréal, QC, Canada.

Science (New York, N.Y.)
|July 10, 2025
PubMed
Summary

Researchers generated metal carbenes with varying polarities from a single precursor type. This discovery offers a versatile approach to synthesizing diverse metal carbene species for various chemical applications.

Area of Science:

  • Organometallic Chemistry
  • Catalysis

Background:

  • Metal carbenes are crucial intermediates in organic synthesis and catalysis.
  • Controlling the polarity of metal carbenes is essential for tuning their reactivity.
  • Existing methods often require multiple precursor types to access carbenes with different polarities.

Purpose of the Study:

  • To develop a unified strategy for generating metal carbenes with distinct polarities.
  • To demonstrate the versatility of a single precursor class in accessing diverse carbene species.

Main Methods:

  • Synthesis of a specific precursor molecule.
  • Generation of metal carbenes via controlled reaction conditions.
  • Characterization of the generated metal carbenes and their electronic properties.

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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions

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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions
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1,3,5-Triphenylbenzene and Corannulene as Electron Receptors for Lithium Solvated Electron Solutions

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Main Results:

  • Successful generation of both nucleophilic and electrophilic metal carbenes from the same precursor.
  • Demonstration of tunable polarity by adjusting reaction parameters.
  • Confirmation of carbene structures and electronic properties through spectroscopic and computational methods.

Conclusions:

  • A single precursor class can effectively generate metal carbenes with divergent polarities.
  • This approach simplifies the synthesis of metal carbenes, offering broader accessibility.
  • The findings provide a powerful tool for designing new catalytic systems and synthetic methodologies.