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Related Concept Videos

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.5K
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.
2.5K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
3.5K
Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism01:14

Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism

3.4K
The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character,  phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...
3.4K
Aldehydes and Ketones to Alkenes: Wittig Reaction Overview01:19

Aldehydes and Ketones to Alkenes: Wittig Reaction Overview

7.6K
The Wittig reaction is the conversion of carbonyl compounds-aldehydes and ketones-to alkenes using phosphorus ylides, or the Wittig reagent. The reaction was pioneered by Prof. Georg Wittig, for which he was awarded the Nobel Prize in Chemistry.
7.6K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.0K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.0K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

17.9K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
17.9K

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Related Experiment Video

Updated: Jun 17, 2025

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides
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Transition from Kwon [4+2]- to [3+2]-cycloaddition enabled by AgF-assisted phosphine catalysis.

Jinlong Qian1, Lijin Zhou1, Yuyi Wang1

  • 1School of Pharmaceutical and Chemical Engineering & Institute for Advanced Studies, Taizhou University, Taizhou, Zhejiang, 318000, China.

Nature Communications
|August 14, 2024
PubMed
Summary

A novel silver fluoride (AgF) additive transforms phosphine catalysis intermediates, enabling a new P(III)/P(V) catalytic cycle. This expands phosphine catalysis applications, particularly in asymmetric cycloadditions.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Organophosphorus Chemistry

Background:

  • Phosphine catalysis typically involves carbanion-phosphonium zwitterions formed from phosphine nucleophilic addition to electrophiles.
  • Modifying zwitterion structures with different electrophiles is a common method to diversify phosphine catalysis.

Purpose of the Study:

  • To introduce a new strategy using silver fluoride (AgF) to expand the scope of phosphine catalysis.
  • To investigate the mechanism of AgF-mediated transformation of intermediates in phosphine catalysis.

Main Methods:

  • Utilizing AgF as an additive in phosphine-catalyzed reactions.
  • Investigating the reaction between 2-substituted allenoates and imines.
  • Employing experimental and computational studies to elucidate the catalytic mechanism.

Main Results:

  • AgF converts carbanion-phosphonium zwitterions to silver enolate-fluorophosphorane intermediates, initiating a P(III)/P(V) catalytic cycle.
  • The strategy successfully shifted a Kwon [4+2] cycloaddition to a [3+2] cycloaddition.
  • The new [3+2] cycloaddition exhibited high diastereoselectivity, good yields, and broad substrate compatibility.

Conclusions:

  • The AgF-assisted strategy provides an alternative route to expand phosphine catalysis.
  • This approach facilitates the development of P(III)/P(V) catalysis, offering a powerful tool for organic synthesis.
  • The findings suggest significant potential for AgF in advancing organophosphorus chemistry.