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The reaction of [Se 8 ][B 12 F 11 NH 3 ] 2 with acetone and subsequent crystallization from acetone/diethyl ether yielded the selenium cation [Se(CH 2 C(O)CH 3 ) 3 ] + as a by-product, which is stabilized by the weakly coordinating undeca-fluorinated anion [B 12 F 11 NH 3 ] - . While attempting to crystallize pure [Se 8 ][B 12 F 11 NH 3 ] 2 , the structure of the isolated product, namely, tris-(2-oxoprop-yl)selenium 1-ammonio-undeca-fluoro-dodeca-borate, was surprising. The cation [Se(CH 2 C(O)CH 3 ) 3 ] + represents the first example for a cationic selenium compound with three ketone functional groups located in the β-position with respect to the selenium atom. The cation possesses almost trigonal-pyramidal C  3 symmetry and forms hydrogen bonds to the ammonio group of the anion.

[Se(CH2C(O)CH3)3][B12F11NH3]: The first selenium cation with three β-ketone substituents