No abstract

Synthesis of sulfamoyl [18F]­fluorides has been a challenging topic owing to the inefficient nucleophilic radiofluorination of sulfamoyl derivatives. Herein, we report an 18F/19F isotopic exchange approach to synthesize various sulfamoyl [18F]­fluorides, otherwise inaccessible via direct synthesis from amines, with high radiochemical yields up to 97% (30 examples). This late-stage labeling protocol offers an efficient route to yield functionalized molecules by diversifying the chemical library possessing sulfamoyl functionalities through nucleophilic 18F incorporation within nitrogen-containing sulfur­(VI) frameworks.

Ensuring interfacial stability of Si-containing anodes and Ni-rich cathodes is the key to achieving highenergy lithium-ion cells. Herein, we present 4-(allyloxy)phenyl uorosulfate (APFS), a multi-functional electrolyte additive that forms a mechanical strain-adaptive solid electrolyte interphase (SEI) composed of LiF and polymeric species, and a thermally stable cathode-electrolyte interface containing S-O and S-F species. Radical copolymerization of vinylene carbonate (VC) with APFS via electrochemical initiation creates a spatially deformable polymeric SEI on the Si/C-graphite (SiG-C) anode with large volume changes during cycling. Here we show that APFS-promoted interfacial layers reduce Ni dissolution and deposition and that APFS deactivates Lewis acidic PF 5 , inhibiting the hydrolysis that produces unwanted HF. These results show that the combined use of VC and APFS allows capacity retention of 72.5% with a high capacity of 143.5 mAh g − 1 after 300 cycles at 45°C.

The flammability of organic electrolytes raises increasing safety concerns about the high-capacity batteries of next-generation electric vehicles and smart grid systems, Herein, we report a synthetic dual-functional electrolyte additive bearing...

We report the direct radiofluorosulfurylation method for the synthesis of 18F-labeled fluorosulfuryl derivatives from phenols and amines using an [18F]FSO2 + transfer agent generated in situ. Nucleophilic radiofluorination is achieved even in a hydrous organic medium, obviating the need for azeotropic drying and the use of cryptands. This unprecedented, operationally simple isotopic functionalization facilitates the reliable production of potential radiotracers for positron emission tomography, rendering facile access to SuFEx radiochemistry.