Perfluoroorganylxenonium(II) salts from reactions of XeF2 or [FXe][SbF6] with selected perfluorinated alk-1-yn-1-yl- and alk-1-en-1-yltrifluoroborate salts in aHF

Xenon difluoride reacted with alkynylborate salts, K[RFCCBF3], in anhydrous HF (aHF) to give alkynylxenonium salts, [RFCCXe][BF4] (RF = CF3, C3F7, (CF3)2CF), in 50–55% yield. Both [FXe][SbF6] and K[C3F7CCBF3] formed the [C3F7CCXe]+ salt in aHF. In the reaction of XeF2 with the alkenylborate salt, K[CF2C(CF3)BF3], the competitive hydrodeboration reaction (formation of CF2C(CF3)H in 85% yield) exceeded the xenodeboration reaction (formation of the xenonium salt [CF2C(CF3)Xe][BF4] in 15% yield only). K[4-BF3C5F4N] did not react with XeF2 in aHF, but underwent fluorine addition in the presence of AsF5.