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Related Concept Videos

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom, respectively.
Carbocations02:10

Carbocations

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...
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...
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...
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.

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

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Fused polycyclic nucleophilic carbenes - synthesis, structure, and function.

Anthony J Arduengo1, Luigi I Iconaru

  • 1Department of Chemistry, The University of Alabama, Tuscaloosa, Alabama 35487, USA. ajarduengo@worldnet.att.net

Dalton Transactions (Cambridge, England : 2003)
|May 8, 2010
PubMed
Summary

Stable nucleophilic carbenes, especially fused polycyclic variants, have expanded significantly since 1991. Their diverse structures and reactivity offer new avenues for chemical transformations and process innovation.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Materials Science

Background:

  • The isolation of the first stable nucleophilic carbene in 1991 spurred significant research interest.
  • Nucleophilic carbenes are versatile compounds with broad applications in synthesis and catalysis.
  • Structural diversity and reactivity of these carbenes have expanded dramatically.

Purpose of the Study:

  • To review the structural and reactivity landscape of fused polycyclic carbenes.
  • To highlight the advancements and potential of these carbene compounds in chemical research.

Main Methods:

  • Literature review focusing on fused polycyclic carbene synthesis and applications.
  • Analysis of structural variations and reactivity patterns reported in recent studies.

Main Results:

  • Significant expansion in the structural diversity of fused polycyclic carbenes.
  • Demonstration of novel reactivity enabling new chemical transformations.
  • Identification of opportunities for process improvements and new synthetic methodologies.

Conclusions:

  • Fused polycyclic carbenes represent a dynamic area of chemical research.
  • Their unique structural and electronic properties facilitate innovative applications in catalysis and synthesis.
  • Continued exploration promises further advancements in chemical transformations.