Abstract The arylxenonium salt [C6F5Xe][BF4] reacts with different sources of nucleophiles, Y (naked fluoride,[N (CH3) 4] F, the silanes,(CH3) 3SiCl and (C2H5) 3SiH, and the cadmiumorganyl, Cd (C6F5) 2), in coordinating solvents (C2H5CN, CH3CN, CD3CN). While the products C6F5XeF, C6F5XeCl, and (C6F5) 2Xe are well defined molecules, in reactions with (C2H5) 3SiH only decomposition products presumably derived from< C6F5XeH> and ...