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Related Concept Videos

Base-Catalyzed Aldol Addition Reaction01:08

Base-Catalyzed Aldol Addition Reaction

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As depicted in Figure 1, base-catalyzed aldol addition involves adding two carbonyl compounds in aqueous sodium hydroxide to form a β-hydroxy carbonyl compound.
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Nucleophilic Aromatic Substitution: Elimination–Addition01:11

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
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Introduction to Electrophilic Addition Reactions of Alkenes02:24

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The double bond in a simple, unconjugated alkene is a region of high electron density that can act as a weak base or a nucleophile. The filled π orbital (HOMO) of the double bond can interact with the empty LUMO of an electrophile. A bonding interaction occurs when the electrophile attacks between the two carbons; the electrophile then accepts a pair of electrons from the π bond and undergoes addition across the double bond, yielding a single product.
Addition and elimination...
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Conjugate Addition (1,4-Addition) vs Direct Addition (1,2-Addition)01:27

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α,β-Unsaturated carbonyl compounds with two electrophilic sites, the carbonyl carbon, and the β carbon, are susceptible to nucleophilic attack via two modes: conjugate or 1,4-addition and direct or 1,2-addition.
Conjugate addition results in a thermodynamically stable product. The reaction retains the stronger C=O bond at the expense of the weaker C=C π bond. The process is slow as the β carbon is less electrophilic than the carbonyl carbon.
Direct addition products are...
3.3K
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α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.
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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

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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.
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Solvent-free base-controlled addition reaction of

Qianding Zeng1, Ying Liu1, Jingjing He1

  • 1Shanghai Key Laboratory of Chemical Biology, School of Pharmacy, East China University of Science and Technology (ECUST), Shanghai 200237, China. scao@ecust.edu.cn.

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Summary

A new solvent-free method efficiently synthesizes valuable trifluoromethyl-containing phosphonates and phosphine oxides. This green chemistry approach works quickly at room temperature, preserving crucial chemical bonds.

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Area of Science:

  • Organic Chemistry
  • Organophosphorus Chemistry
  • Fluorine Chemistry

Background:

  • Trifluoromethyl-substituted organophosphorus compounds are valuable in medicinal chemistry and materials science.
  • Existing synthetic methods often require harsh conditions or lack efficiency.
  • Developing mild and efficient routes to these compounds remains a key challenge.

Purpose of the Study:

  • To develop a practical and efficient solvent-free synthesis for β-trifluoromethyl-substituted phosphonates and phosphine oxides.
  • To investigate the hydrophosphonylation and hydrophosphinylation of α-(trifluoromethyl)styrenes.
  • To ensure the stability of the trifluoromethyl group and other functional groups during the synthesis.

Main Methods:

  • Solvent-free reaction of α-(trifluoromethyl)styrenes with H-phosphonates and H-phosphine oxides.
  • Utilizing room temperature conditions for the hydrophosphonylation and hydrophosphinylation reactions.
  • Characterization of the synthesized β-trifluoromethyl-containing phosphonates and phosphine oxides.

Main Results:

  • Successful synthesis of a wide variety of β-trifluoromethyl-substituted phosphonates and phosphine oxides.
  • Reactions proceeded smoothly within 2 hours at room temperature.
  • Moderate to good yields were achieved without cleavage of the C-F bond.
  • The protocol demonstrated excellent functional group compatibility.

Conclusions:

  • A practical and efficient solvent-free synthetic protocol was established.
  • The developed method offers mild conditions, a wide substrate scope, and simple manipulation.
  • This approach provides valuable β-trifluoromethyl-containing organophosphorus compounds with high efficiency and functional group tolerance.