Benzosilagermacyclobutene bearing two Ar groups on the germanium atom [Ar = o-(fluorodimethylsilyl)phenyl] undergoes cleavage of the Ge-Si bond with KF in the presence of a cryptand to form Ar(3)Ge(-)[K(+)(cryptand)] with alpha,delta-ambiphilic character consisting of the germyl anion center and the fluorosilyl moieties. In the presence of LiBPh(4).3dme or BF(3).Et(2)O, the germylpotassium is converted back into the benzosilagermacyclobutene.
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