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

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.