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Hexachloroantimonate [SbC16] -salts of stable organic cations are shown to be active oxidising agents for aromatic amines, ferrocene, phenoxide ions, and iodide ion. Tetra-alkylammonium hexachloroantimonates oxidise Leuco Crystal Violet to Crystal Violet by apparent hydride-abstraction. Kinetic studies show that the reactions have very low activation-energies and an approximate value for the primary kinetic isotope effect kCH/kCD -2.5. It is possible therefore that [SbC16]functions primarily as a one-electron oxidant. Complex chlorides of Sbul are produced in the oxidations and new crystalline salts of [SbCI,]-, [Sb,Clels-, and the very unstable [SbC16]3-have been characterised. Photolysis of [Me,Ph(PhCH,)N]+[SbCI,]in tetrahydrofuran gives an apparent chainreaction in which hydrogen chloride and [Me,Ph(PhCH,)N] +3[SbzC1,]3-are formed in very high yield. THE oxidising capabilities of antimony(v) have not been utilised to any great extent in either inorganic or organic equation (l)]. More recently antimony pentachloride chemistry. Chlorination of reactive hydride donors RH + 2SbC1, _C R+[SbClJ-+ SbC1, $-HCI (1) (triphenylrnet11ane, cycloheptatriene, -9J10-dihydroanthracene and etbers) occurs readily with SbC& ' [see 1

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