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Related Concept Videos

Carbocations02:10

Carbocations

11.5K
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...
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Properties of Organometallic Compounds01:23

Properties of Organometallic Compounds

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Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
1.1K
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.2K
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...
4.2K
Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

14.6K
If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...
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Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

8.4K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.4K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.9K
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...
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Updated: Sep 2, 2025

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

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Safe, selective, and scalable carbenes.

Michael S West1, Sophie A L Rousseaux1

  • 1Davenport Research Laboratories, Department of Chemistry, University of Toronto, Toronto, ON, Canada.

Science (New York, N.Y.)
|August 4, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a safer and simpler method for synthesizing reactive carbene intermediates. These compounds are crucial in various chemical reactions, and this new approach enhances accessibility for researchers.

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Last Updated: Sep 2, 2025

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Area of Science:

  • Organic Chemistry
  • Synthetic Chemistry

Background:

  • Reactive carbene intermediates are highly versatile in organic synthesis.
  • Traditional methods for carbene generation can be hazardous and complex.

Purpose of the Study:

  • To develop a simplified and safer protocol for the synthesis of reactive carbene intermediates.
  • To improve the accessibility and handling of these reactive species in chemical research.

Main Methods:

  • A novel synthetic route was employed for carbene generation.
  • Reaction conditions were optimized for safety and efficiency.

Main Results:

  • The new method successfully produced reactive carbene intermediates under mild conditions.
  • The protocol demonstrated enhanced safety profiles compared to existing techniques.

Conclusions:

  • The developed method offers a significant advancement in carbene synthesis.
  • This approach facilitates broader application of carbene chemistry in various fields.