Synthesis Strategy of Pentafluorothio Group-Synthesis of SF₅Cl
Product Manager：Nick Wilde
Pentafluorosulfanyl chloride (SF₅Cl), a pivotal reagent for direct pentafluorosulfanylation, has seen remarkable advancements in synthesis and handling safety. Key developments include:
Mild Reaction Systems
In 2021, the Qing group established a catalyst-free, light-free protocol in n-hexane, yielding solutions stable for months at room temperature. Pitts and Tantillo (2025) simplified the process using n-hexane/acetonitrile co-solvents, eliminating thermal cycling.
Disulfide Oxidation Route
In 2016, building on Shibata’s work with 1,2-di(pyridin-3-yl)disulfane/Cl₂/KF, De Borggraeve’s team employed TCCA (9 eq.) and excess KF (64 eq.) to convert 4-pyridyl disulfide to SF₅Cl at -94°C in 87% yield.
Photoactivated SF₆ Conversion
In 2022, tlili et al. esigned a photoredox strategy: SF₆ and excited TDAE (4) underwent electron transfer under blue LED, forming SF₅·TDAE·F (5), which reacted with TCCA at -10°C to release SF₅Cl.
Flow Chemistry & Membrane Separation
In 2025, Charette’s group developed a continuous flow system: TCC/acetonitrile flowed through a KF/sulfur-packed reactor, followed by membrane extraction (Zaiput OB-100) to isolate SF₅Cl in n-hexane, enabling 93% yield in alkyne functionalization (→7).