Abstract
1,4-Difluoro-1,4-diazoniabicyclo [2.2.2] octane salts, F− +N(CH 2CH 2) 3N + −F 2X − ( 2) where X − = BF 4 −, PF 6 −, FSO 3 −, CF 3SO 3 −, have been synthesised by direct fluorination of 1:1 or 1:2 Lewis acid adducts of 1,4-diazabicyclo[2.2.2]octane with boron trifluoride, phosphorus pentafluoride or sulfur trioxide, and of 1,4-bis(trimethylsilyl)-1,4-diazoniabicyclo[2.2.2]octane ditriflate, respectively, in cold acetonitrile. The bis(tetrafluoroborate) salt ( 2; X − = BF 4 − has also been obtained via fluorination of 1-heptafluoro- n-butyryl-1,4-diazo-niabicyclo[2.2.2]octane-trifluoromonoborane tetrafluoroborate.
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