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Giving a Second Life to Curphey's Reagent
1Univ Angers, CNRS, MOLTECH-Anjou, SFR Matrix, F-49000 Angers, France.
The Journal of Organic Chemistry
|November 30, 2025
Summary
Curphey's reagent (CR), a phosphorus pentasulfide and hexamethyldisiloxane system, efficiently synthesizes multithionated perylenediimide derivatives. This sulfur chemistry advancement offers superior yields and selectivity for organic semiconductor development.
Area of Science:
- Organic Chemistry
- Materials Science
- Supramolecular Chemistry
Background:
- Thomas J. Curphey developed a novel thionation system using phosphorus pentasulfide (P4S10) and hexamethyldisiloxane (HMDSO), known as Curphey's reagent (CR).
- Curphey's reagent provides a user-friendly, selective alternative to Lawesson's reagent for converting carbonyls to thiocarbonyls.
- Multithionated perylenediimide (PDI) derivatives are crucial n-type organic semiconductors with applications in photophysics and biomedicine.
Purpose of the Study:
- To investigate the application of Curphey's reagent (CR) in synthesizing multithionated perylenediimide (PDI) derivatives.
- To compare the efficiency and selectivity of CR with Lawesson's reagent (LR) for PDI thionation.
- To explore how structural modifications influence the thionation extent and electronic properties of PDIs.
Main Methods:
- Optimization of reaction conditions for Curphey's reagent-mediated thionation of PDI scaffolds.
- Synthesis of PDI derivatives with structural variations at bay and imide positions.
- Characterization of the resulting multithionated PDI compounds and analysis of their electronic properties.
Main Results:
- Optimized conditions using CR selectively produced tri- and tetrathionated PDI derivatives with high yields.
- CR demonstrated superior performance compared to LR, which tended to yield lower degrees of thionation.
- Electronic and steric effects at different PDI positions were found to influence the extent of thionation.
Conclusions:
- Curphey's reagent is a versatile and potent tool for synthesizing multithionated PDIs, enabling fine-tuning of electronic properties.
- This study highlights CR's potential for developing advanced organic electronic materials and phototherapeutic agents.
- The findings revive interest in Curphey's reagent for contemporary synthetic applications in organic chemistry.
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