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Related Concept Videos

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...
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sp3d and sp3d 2 Hybridization
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The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
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VSEPR Theory for Determination of Electron Pair Geometries
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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.
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Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism01:14

Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism

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The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
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Updated: May 23, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

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Carbene-supported triphosphorus anion.

Yanbo Mei1,2, Xue-Yi He3, Jiancheng Li3

  • 1Department of Chemistry, College of Science, Southern University of Science and Technology, Shenzhen, China. meiyanbo@gbu.edu.cn.

Nature Communications
|March 8, 2025
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel anionic triphosphorus ([P3]) unit stabilized by cyclic (alkyl)(amino)carbenes (CAACs). This discovery expands phosphorus chemistry, enabling versatile functionalization and the creation of new conjugated systems.

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Area of Science:

  • Main Group Chemistry
  • Organophosphorus Chemistry
  • Carbene Chemistry

Background:

  • Stabilizing reactive anionic main group species with carbenes is an emerging research area.
  • Cyclic (alkyl)(amino)carbenes (CAACs) are effective ligands for stabilizing reactive species.

Purpose of the Study:

  • To synthesize and characterize a novel anionic triphosphorus ([P3]) unit stabilized by CAACs.
  • To explore the reactivity and potential applications of this new phosphorus species.

Main Methods:

  • Synthesis of potassium salts of the anionic [P3] unit supported by CAACs.
  • Spectroscopic and crystallographic characterization of the synthesized compounds.
  • Investigation of the anion's basicity, nucleophilicity, and reductive properties.

Main Results:

  • Successful synthesis of a planar, W-shaped, conjugated C-P-P-P-C framework with 5-center-6-electron π delocalization.
  • The [P3] anion exhibits strong basicity, nucleophilicity, and reductive character.
  • Isolation of unique carbene-supported phosphorus cores, including [HP3], [P3N3R]−, [P3O]−, and [P6].
  • Demonstration of the [P3] unit's reactivity via addition to diphenylacetylene, forming an extended conjugated system.

Conclusions:

  • The carbene-supported [P3] anion represents a versatile building block in phosphorus chemistry.
  • This work expands the scope of isolable carbene-supported main group compounds.
  • The developed methodology opens new avenues for synthesizing novel phosphorus-containing materials and molecules.