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Exploring α-electron-deficiency-induced [1,2]-fluorine migration.

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|October 20, 2023
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This study reveals that [1,2]-fluorine migration occurs via a synchronous, tight-ion-pair mechanism, even within complex rearrangements. This finding offers a general reaction pathway for synthesizing α-monofluoroketones efficiently.

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Area of Science:

  • Organic Chemistry
  • Reaction Mechanisms
  • Computational Chemistry

Background:

  • Investigating fluorine migration is crucial for developing novel synthetic methodologies.
  • Understanding the mechanisms of [1,2]-fluorine migration is key to controlling reactivity.
  • Cyclopropyl-substituted fluoroepoxides present unique challenges in fluorine migration studies.

Purpose of the Study:

  • To elucidate the mechanism of standard [1,2]-fluorine migration.
  • To explore fluorine migration triggered by cyclopropyl-substituted fluoroepoxide rearrangement.
  • To propose general reaction pathways for fluorine migration reactions.

Main Methods:

  • Computational chemistry was employed to scrutinize reaction mechanisms.
  • Analysis of intermediates from nucleophilic addition was performed.
  • Gibbs free energy changes were correlated with Fukui functions.

Main Results:

  • The [1,2]-fluorine migration proceeds via a synchronous concerted, tight-ion-pair mechanism.
  • A general reaction program for α-electron-deficiency-induced [1,2]-fluorine migration was proposed.
  • Two additional reaction programs for [1,2]-fluorine migration were identified.
  • A linear dependence between Gibbs free energy change and Fukui function was observed.

Conclusions:

  • The study clarifies the intricate mechanisms of [1,2]-fluorine migration.
  • Proposed reaction programs enhance the understanding and application of fluorine migration.
  • The findings facilitate the efficient synthesis of α-monofluoroketones and improve fluorine atom utilization.