XeF2/Fluoride Acceptors as Versatile One-Electron Oxidants

摘要

The special bonding situation in three-membered cyclic selenirenium ions was planned to be investigated by an experimental electron density distribution. For this purpose the anions of these salts should contain only light elements. The idea was to synthesize Me3Se3~+ BF4 as the MeSe~+ transfer reagent by oxidation of Me2Se2 with XeF2 and BF3-OEt2 as fluoride acceptor, similar to the preparation of Me3Se3~+ SbCl6~- , Surprisingly however, this oxidation led to the four-membered cyclic Me4Se4~(2+) (BF4~-)2 rather than to Me3Se3~+ BF4 (Scheme 1).