1: With sulfur dioxide; cesium fluoride in acetonitrile T=20°C; 24 h; 2: With 1-(chloromethyl)-4-fluoro-1,4-diazoniabicyclo-[2.2.2]octane bis(tetrafluoroborate) in acetonitrile T=-40 - 20°C; 4 h; 3: With 3-chloro-benzenecarboperoxoic acid in dichloromethane T=0 - 20°C; 24 h; Further stages. Title compound not separated from byproducts.;

1: With sulfur dioxide; cesium fluoride in acetonitrile T=20°C; 24 h; 2: With 1-(chloromethyl)-4-fluoro-1,4-diazoniabicyclo-[2.2.2]octane bis(tetrafluoroborate) in acetonitrile T=-40 - 20°C; 4 h; Further stages. Title compound not separated from byproducts.;

With  3-chloro-benzenecarboperoxoic acid in  dichloromethane T=0 - 20°C;   

Multi-step reaction with 4 steps 1: sulfur dioxide; cesium fluoride / acetonitrile / -40 - 20 °C / Inert atmosphere2: Selectfluorreg; / acetonitrile / -40 - 20 °C / Inert atmosphere3: 1,2-dichloro-ethane / 20 h / 50 °C / Inert atmosphere4: N-ethyl-N,N-diisopropylamine / dichloromethane / 1.5 h / 0 - 20 °C / Inert atmosphere